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A Manual of Conchology: According to the System Laid Down by Lamarck, with the Late Improvements by De Blainville. Exemplified and Arranged for the Use of Students.Wyatt, Thomas

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A Manual of Conchology: According to the System Laid Down by Lamarck, with the Late Improvements by De Blainville. Exemplified and Arranged for the Use of Students.

Name: A Manual of Conchology: According to the System Laid Down by Lamarck, with the Late Improvements by De Blainville. Exemplified and Arranged for the Use of Students.
Author: Wyatt, Thomas

Wyatt, Thomas

Mollusks

The Donax is found buried deep in the sand of the seashore, with the
short side uppermost.

Shell sub-trigonal, greater in length than in height, equivalve, very
inequilateral; posterior side much shorter than the anterior; summits
almost vertical; hinge complex, similar; two cardinal teeth in one or
both valves; one or two remote lateral teeth on each valve; ligament
posterior, short, and inflated; two rounded muscular impressions.

                           Donax scortum.
                           D. pubescens.
                           D. compressa.
                           D. cuneata.
                           D. deltoides.
                           D. radians.
                           D. abbreviata.
                           D. triquetra.
                           D. ringens.
                           D. rugosa.
                           D. Cayennensis.
                           D. elongata.
                           D. denticulata.
                           D. granosa.
                           D. columbella.
                           D. veneriformis.
                           D. Australis.
                           D. epidermia.
                           D. bicolor.
                           D. vittata.
                           D. meroe.
                           D. scripta.
                           D. trunculus.
                           D. flabagella.
                           D. cinatinum.
                           D. Martinicensis.
                           D. cardioides.

_D. scortum._ The beaked Donax. Pl. 8, fig. 4.

Species oval, of which the posterior side is sub-truncated; with
decussated and muricated striæ.

_D. trunculus._ The common Donax.

Oblong, glossy, finely striated longitudinally, transversely banded and
radiated with purple; white, clouded with purple within; internal margin
of the valves distinctly dentated or crenulated.

_D. denticulata._ The denticulated Donax.

Species of which the posterior side is truncated; furrowed from the
summit to the base.


                         9. Capsa. Two species.

This genus was separated by Lamarck from the Donax on account of the
peculiarity of the hinge.

                          Capsa lævigata.
                          Capsa Braziliensis.

_C. lævigata._ The smooth Capsa.

Triangular, sub-equilateral, obsoletely striated transversely; covered
with a greenish yellow epidermis; inside violet towards the umbones.

_C. Braziliensis._ The Brazilian Capsa. Pl. 8, fig. 7.

Shell elongated, covered with epidermis; equivalve, close; the cardinal
teeth reduced to one large sub-bifid tooth on the right valve, placing
itself between two very thin ones on the left; ligament external, on the
short side.


                       10. Crassina. One species.

Distinguished from the Crassatella by the position of the ligament, and
from the Venus by having only two teeth on each valve; one of them on
the left valve projects very slightly.

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A Manual of Conchology: According to the System Laid Down by Lamarck, with the Late Improvements by De Blainville. Exemplified and Arranged for the Use of Students.

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