NO. 1704. A COLLECTION OF SHELLS FROM PERU—DALL. 197 



Class GASTROPODA. 



Subclass ANISOPLEURA. 



Superorder OPISTHOBRANCHIATA. 



Order F»TKROF»ODA. 



Suborder GYMNOSOMATA. 



Family PNEUMODERMATID^. 



Genus PNEUMODERMON Cuvier. 



PNEUMODERMON BOASI Pelseneer. 



1888. Challenger Pterop., p. 30, pi. 2, fig. 3. Off Caldera, Chile, 

 8. lat. 27'^. 



Genus DEXIOBRANCH^^A Boas. 



DEXIOBRANCHiEA POLYCOTYLA Boas. 



1886. Spolia Atlantica, vol. 1, p. 161. Challenger Pterop., p. 17, 

 pi. 1, figs. 1, 5, 1888. Oft' Chile, S. lat. 27° to 37'^ 30'. 



DEXIOBRANCH.ffi;A SIMPLEX Boas. 



1886. Spolia Atlantica, vol. 4, p. 160. Challenger Pterop. , p. 16, 

 pi. 1, fig. 3, 1888. Off Caldera, Chile, in S. lat. 27' 



70 



Suborder THECOSOMATA. 



Family CAVOLINIID^. 



Genus CAVOLINA Abildgaard. 



CAVOLINA GIBBOSA Rang. 



1836. Ilyalxa gihhosa Rang, in Orbigny, Voy. Am. Mer., p. 95, 

 pi. 5, figs. 16-25. Southeast Pacific, Atlantic, and Indian 

 .seas. 



CAVOLINA INFLEXA Lesueur. 



1813. Hyalsea infiexa Lesueur, Nouv. Bull. Soc. Philom., vol. 

 3, p. 285, pi. 5, fig. 3. Eastern Pacific from N. lat. 13° to 

 S. lat. 42°. Also Atlantic. 



CAVOLINA LONGIROSTRIS Lesueur. 



1822. llyala^a lonxjirodris Lesueur, Diet. Sci. Nat., vol. 22, 

 p. 81. — Orbigny, Voy. Am. Mer., p. 101, pi.- 6, figs. 11 to 

 15, 1836. 8. lat. 12° to N. lat. 23°. Also Atlantic. 



CAVOLINA TELEMUS Linnaeus, var. OCCIDENTALIS Dall. 



1758. Monoculus telemus Linn^us, Syst. Nat., 10th ed., p. 1059. 

 Hyaldda tridentata (Forskal) Boas, Spolia Atlantica, p. 115, 

 pi. 1, figs. 8, 9; pi. 2, fig. 19; pi. 4, fig. m-, pi. 6, fig. 100, 

 1886. Off the west coast of South America and the Galapagos 

 Islands. Also North Pacific. 



