DALL: MOLLUSCA AND BRACHIOPODA. 235 
Cavolina uncinata Rane. 
Hyalaea uncinata Rang (MS.), in D’Orbigny, Voy. dans Am. Mérid., 1836, p. 93, 
pl. 5, figs. 11-13. 
Cavolina uncinata Gray, Cat. Moll. Brit. Mus., 1850, 2, Pteropoda, p. 7. 
Station 3422, U. S. S. “ Albatross,” off Acapulco, Mexico, U. 8. N. Mus. 
123,071; stations 3354 and 3392 in the Gulf of Panama; and station 3398 off the 
coast of Heuador. 
General distribution in the Atlantic from off Martha’s Vineyard, Massachusetts, 
in about latitude 41° N. south to latitude 20° 30’ S., eastward to the Cape of Good 
Hope, the Indian Ocean, and the Bay of Bengal; the China and Japan seas in the 
Western Pacific, and in the Eastern Pacific from the equator to Cape St. Lucas in 
about latitude 28° N. It was found by Grayson very abundant on the surface 
near the entrance to the Gulf of California. 
Cavolina longirostris Lrsveur. 
Hyalaea longirostris Lesueur (MS.), in Blainville, Dict. Sci. Nat., 1821, 22, p. 81. 
Hyalaea limbata D’Orbigny, Voy. dans l’Am. Meérid., 1836, p. 101, pl. 6, figs. 11-15. 
Cavolina longirostra Gray, Cat. Moll. Brit. Mus., 1850, 2, Pteropoda, p. 8. 
U. 8. S. “ Albatross,” stations 3407 and 4751, near the Galapagos Islands ; 
U. S. N. Mus. 123,072; and station 3422, off Acapulco, Mexico. 
General distribution, in the Atlantic, from about latitude 42° N., south to latitude 
40° S. ; eastward to the Indian Ocean, Red Sea, Australia, the Philippines, and 
Japan; and in the Eastern Pacific from latitude 23° N. to latitude 12° S. 
This is perhaps the most abundant, widely distributed, and variable species of 
the genus. Adult specimens vary from 7.5 x 6.0 mm., to 3.0 & 2.25 mm. in 
length and width. 
While discussing the pteropods, it may be mentioned that Clio sulcata Pfeffer, was 
obtained off Manta, Ecuador, by the “ Albatross ” in 1888; and Cavolina inflexa 
Lesueur, and Limacina inflata Orbigny, were dredged off Cerros Island, Lower 
California, in 1889. 
OPISTHOBRANCHIATA. 
TECTIBRANCHIATA. 
Acteonidae. 
ACTEON Montrort. 
Acteon Montfort, Conch. Syst., 1810, 2, p. 314; type Voluta tornatilis Gmelin ; not 
Acteon Fleming, 1828, or Actaeon Oken, 1815. 
