No. 1704. A COLLECTION OF SHELLS FROM PERU—DALL. 197 
Class GASTROPODA. 
Subclass ANISOPLEURA. 
Superorder OPISTHOBRANCHIATA. 
Order PTEROPODA. 
Suborder GYMNOSOMATA. 
Family PNEUMODERMATID. 
Genus PNEUMODERMON Cuvier. 
PNEUMODERMON BOASI Pelseneer. 
1888. Challenger Pterop., p. 30, pl. 2, fig. 3. Off Caldera, Chile, 
Be lat, 2/72. 
Genus DEXIOBRANCHAZA Boas. 
DEXIOBRANCHAA POLYCOTYLA Boas. 
1886. Spolia Atlantica, vol. 4,p.161. Challenger Pterop., p. 17, 
pl. 1, figs. 4, 5, 1888. Off Chile, S. lat. 27° to 37° 30’. 
DEXIOBRANCHZA SIMPLEX Boas. 
1886. Spolia Atlantica, vol. 4, p.160. Challenger Pterop., p. 16, 
pl. 1, fig. 3, 1888. Off Caldera, Chile, in S. lat. 27°. 
Suborder THECOSOMATA. 
Family CAVOLINIID. 
Genus CAVOLINA Abildgaard. 
CAVOLINA GIBBOSA Rang. 
1836. Hyalea gibbosa Rane, in Orbigny, Voy. Am. Mér., p. 95, 
pl. 5, figs. 16-25. Southeast Pacific, Atlantic, and Indian 
seas. 
CAVOLINA INFLEXA Lesueur. 
1813. Hyalea infleva Lesunur, Nouv. Bull. Soc. Philom., vol. 
3, p. 285, pl. 5, fig. 8. Eastern Pacific from N. lat. 13° to 
S. lat. 42°. Also Atlantic. 
CAVOLINA LONGIROSTRIS Lesueur. 
1822. Hyalea longirostris LesunuR, Dict. Sci. Nat., vol. 22, 
p. 81.—Orpieny, Voy. Am. Mér., p. 101, pl. 6, figs. 11 to 
15, 1836. S. lat. 12° to N. lat. 23°. Also Atlantic. 
CAVOLINA TELEMUS Linnzus, var. OCCIDENTALIS Dall. 
1758. Monoculus telemus Linnaxus, Syst. Nat., 10th ed., p. 1059. 
Hyalea tridentata (ForsKaL) Boas, Spolia Atlantica, p. 115, 
lee ties. 8. 9. pl 2.) orl 4. fie. 66: pl: 6. tie. 100; 
1886. Off the west coast of South America and the Galapagos 
Islands. Also North Pacific. 
