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. 



I. Biphora, 

 Brus- Tha 



Genus. Subgenus. Example of Species. 



i7t "/?>-m7.» \ 1- ^'"^'P^' P™P- ^"^- ' • • ^^'P^ scutigera, Cuv. 

 lia, nronn.y ^ xhalia, Brawn .... Holothuiia thalia, Gm. 

 Salj)a&Da-i 

 gysa, Gjn. ./ 

 II. Ascidia, L. Theiiton of the) 



ancients \''''- P'^'J^^^^l^ta, Edwards 



I. Botryllus, Gcertn Bo. stellia, Gaertner 



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 filaments, which can be withdrawn into the shell.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. Subgenus. Example of Species. 



I. Lingula, Brug Lin. anatina, Cuv. 



TT TpvpKrafnls 7?>-»rr /'' Spirifer, ,Soiwr&^ . . Anomia scobinata, Gualt. 



II. lereDratUla,ZfrM^. ^^ Xhecidia, Def The. Mediterranea, Risso 



III. Orbicula, Cuv Patella anomala, Miill. 



Crania, Brug Anomia craniolaris, L. 



