* * * * * "2nd Order. Shells pedunculated. _Pentalasmis_, (_Anatifera_.) } _Pollicipes_. } _Lepas._ _Cineras._ } _Otion_, ear-barnacle. } "We have already noticed _Pentalasmis_, or barnacle, (Plate 2.) The generic name is changed by later writers; so are those of the two last. "_Pollicipes_ resembles _Pentalasmis_, with a shorter pedicle, which is rough. The natives of Goree are said to eat a large species of _Pentalasmis_." "I think we shall not fail to recollect the _Cirrhipeda_ class," said Lucy; "the forms of the shells are remarkable: and those that live on _Madrepores_ I shall search for immediately; but what a number of new genera are taken from the single one of _Lepas_!" [Sidenote: EXPLANATIONS.] "Since the time of Linnæus," replied Mr. Elliot, "many more observations have been made upon the shells that he had examined; many new shells, both genera and species, have been found; and there is little doubt that, if Linnæus had now been living, he would have found his own genera inadequate, and would have established new ones. I fear you will have to regret the opposite extreme, and complain of the multiplicity of new genera, and new names. Our object is to become familiar with the shells, and by knowing the Linnæan name, and that bestowed by Lamarck, two authorities very generally cited, you may understand what species is alluded to by modern conchologists. The names of Bruguieres, Leach, Gray, and Sowerby will often occur among many others. "For example: let us take the plate of a remarkable multivalve; you find that it is named _Scapellum vulgare_, and that it is so called by Leach. Below, you find '_Pollicipes scapellum_, Lamarck;' and on referring to our comparative lists we find that the shell was a _Lepas_, (_L. scapellum_ of Linnæus.)" [Sidenote: EXPLANATIONS.] "But they have kept the specific name," observed Charles. "And made it the generic," said Mr. Elliot; the peculiarities and variations are deemed insufficient to found a new genus. "Here we shall pause for the present; and then proceed to the 11th Class." CHAPTER VII. Eleventh Class.--_Conchifera._ Two Orders.--1st. _Bimusculosa_, two muscular impressions. 2nd. _Unimusculosa_, one muscular impression. [Sidenote: CONCHIFERA, SHELL-BEARERS.] "This class," observed Mr. Elliot, "contains all the bivalves of Linnæus, and some genera taken from the univalves and multivalves. "The animals of this class are _shell-bearers_ or _carriers_, they remain constantly fixed in their habitations: the body is fastened to the shell by one or two strong muscles: when the shell is vacant we find the _cicatrix_. Refer to your explanation of terms, and you will find the word.