Ivi 
DIV. II. MOLLUSCA. 
ORDER II.— Acephala Nuda. 
These are without a shell. The gills differ among themselves 
in form, but never constitute four leaflets, as in the testaceous 
acephala. 
Family. 
Genus. Subgenus. 
Example of Species. 
I. Biphora, 
Brug. Tha- 
lia, Brown. 
Salpa&Da- 
gysa, Gm. 
II. Ascidia, L. Theyton of the 
ancients 
y 1. Salpa, prop. Cuv. . . . 
2. Thalia, Brown . . . . 
Salpa scutigera, Cuv. 
Holothuria thalia, Gm. 
Asc. pedunculata, Edwards 
I. Botryllus, Gczrtn. . . Bo. stellia, Gsertner 
II. Pyrosoma, Peron. 
III. Polyclinium Pyrosoma elegans, Lesueur 
CLASS V. — BRACHIOPODA. 
In this class, as in the fourth, the mantle has two lobes, and it is 
always open ; but for feet there are fleshy arms, with numerous 
filaments, which can be withdrawn into the shell. All the genera are 
bivalves. 
Genus. 
Sub genus. 
I. Lingula, Brug . . . , 
II. Terebratula,Z?rwg. 
III. Orbicula, Cuv. . 
J 1 . Spirifer, Sowerby 
\ 2. Thecidia, Bef. . . 
Crania, Brug. 
Example of Species. 
. . Lin. anatina, Cuv. 
. . Anomia scobinata, Gualt. 
. . The. Mediterranea, Risso 
. . Patella anomala, Mull. 
. . Anomia craniolaris, L. 
