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The Conchologist's First Book: A System of Testaceous Malacology, Arranged Expressly for the Use of Schools, in Which the Animals, According to Cuvier, Are Given With the Shells, a Great Number of New Species Added, and the Whole Brought Up, as Accurately as Possible, to the Present Condition of the Science.Poe, Edgar Allan

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The Conchologist's First Book: A System of Testaceous Malacology, Arranged Expressly for the Use of Schools, in Which the Animals, According to Cuvier, Are Given With the Shells, a Great Number of New Species Added, and the Whole Brought Up, as Accurately as Possible, to the Present Condition of the Science.

Name: The Conchologist's First Book: A System of Testaceous Malacology, Arranged Expressly for the Use of Schools, in Which the Animals, According to Cuvier, Are Given With the Shells, a Great Number of New Species Added, and the Whole Brought Up, as Accurately as Possible, to the Present Condition of the Science.
Author: Poe, Edgar Allan

Poe, Edgar Allan

Mollusks

·       ·       ·       ·       ·

 N. navicularis.*
 N. tenuisulta.*
 N. proxima.*
 N. acuta.*
 N. myalis.*


                              FAMILY XII.

                        TRIGONACEA. Two genera.


                     1. Genus _Trigonia_. Pl. VIII.

_Animal._ Entirely unknown.

_Shell._ Subtrigonal or suborbicular, thick, regular, equivalve,
inequilateral; summits but slightly prominent, little flexed,
anterodorsal; hinge complex, dorsal, dissimilar; two thick oblong teeth
joined angularly under the summit, strongly furrowed upon the right
valve, penetrating into two excavations of the same form, also furrowed,
in the left valve; ligament postapicial; two distinct muscular
impressions, not united by a band. Inhabits the Australian seas. One
living species. Fifteen fossil.

 Trigonia pectinata.


                     2. Genus _Castalia_. Pl. VIII.

_Animal._ Body large, slightly compressed, or moderately thick, more or
less oval; mantle with thick edges, simple or broken, open in all its
circumference except towards the back a kind of small, incomplete tube,
furnished with two rows of somewhat elongated cirri for the respiratory
cavity; flamelliform and trenchant.

_Shell._ Subtrigonal, equivalve, inequilateral; umbones eroded, covered
with epidermis, and flexed anteriorly; hinge with two lamellar teeth
transversely striated, one distant, posterior and shortened, the other
anterior, long, and lateral; ligament exterior. Habitation unknown. One
species.

 Castalia ambigua.


                              FAMILY XIII.

                         NAIADEA. Four genera.


                       1. Genus _Unio_. Pl. VIII.

_Animal._ See _Castalia_.

_Shell._ Usually very thick, nacred within, covered with epidermis,
corroded at the summits, which are dorsal and subanterior; dorsal hinge
formed by a double precardinal tooth, more or less compressed,
irregularly dentated on the left valve, and simple on the right,
together with a long lamellous tooth under the ligament: ligament
external, dorsal, and postapicial; two muscular impressions, well
marked, besides those of the retractile muscles. The species of this
genus grow more numerous daily; they are found in all countries, but
particularly in North America. One hundred and sixty-seven defined
species. Numerous fossil.

 Unio Batayus.
 U. crassissimus.
 U. elongatus.
 U. litoralis.
 U. pictorum.
 U. platyrhynchus.
 U. marginalis.
 U. tigris.
 U. Egyptiacus.
 U. Niloticus.
 U. Leaii.
 U. crassidens.
 U. obliquus.
 U. plicatus.
 U. purpuratus.
 U. radiatus.
 U. rectus.
 U. retusus.
 U. rotundatus.
 U. Australis.
 U. Nova Hollandica.

The following species are American:

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