CATALOGUE 



OF 



PTEROPODA. 



Class IV. PTEROPODA. 



Head more or less distinct. Eyes none. Mouth often furnished 



with cup-shaped appendages. 

 Fins 2 on the sides of the mouth, or 2 or rarely 4 on the side of the 



body between the head and abdomen: often furnished with a 



small intermedial lobe between them, apparently the rudiment 



of the foot of Gasteropodes. 

 Body ovate or roundish, often enclosed in a thin, conical, cylindrical 



or subglobular shell, with a transverse contracted mouth. 

 Individual unisexual .•* 

 Animals free, floating on the surface of the sea by the assistance of 



their fins. Nocturnal or crepuscular. 



Clio, Browne, Jam. 386, 1756; Linn. S. N. ed. 12, i. 1094, 1767. 

 Mollusca Brachiata, part, Poli. Test. Sicil. i. 27. 

 MoUusca nuda nageant, part, Latr. Diet. Hist. Nat. xxiv. 108, 1804. 

 Cephalopoda pinnata, Esch. Zool. Atlas, iii. 1829 ; MenJce, Zeitschr. 



Mai. 72, 1844. 

 Pterobranches (ou Pterodibranches), Blainv. Bull. Soc. Philom. 



1814, 177; Organ. Anim. i. t. 8, 1822. 

 Pterodibranchiata, Blainv. Bull. Soc. Philom. 1816, 28, 122. 

 Acephales, part, Blainv. Bull. Soc. Philom. 1814, 179. 

 Pteropoda (Pteropodes), Cuvier, Ann. du Mus. iv. 223, 1804 ; Bronn, 



Gesch. d. Natur. iii. 353, 1847; D'Orb. Voy. Amer. Merid. 65; 



Rang, Man. Moll. 112, 1829 ; Gray, Proc.'Zool. Soc. 1847, 203. 



B 



