DALL: MOLLUSCA AND BRACHIOPODA. 290 
Cavolina uncinata Raxa. 
Hyalaca uncinata Rang (MS.), in D'Orbigny, Voy. dans l'Am. Mérid., 1836, p. 93, 
pl. 5, figs. 11-18. 
Cavolina uncinata Gray, Cat, Moll. Brit. Mus., 1850, 2, Pteropoda, p. 7. 
Station 3499, U. S. S. * Albatross," off Acapulco, Mexico, U. S. N. Mus. 
123,071; stations 3354 and 3399 in the Gulf of Panama ; and station 3398 off the 
Coast of Ecuador, i : 
General distribution in the Atlantic from off Martha's Vineyard, Massachusetts, 
In about latitude 41° N. south to latitude 20° 30' 5., eastward to the Cape of Good 
Hope, tho Indian Ocean, and the Bay of Bengal ; the China and Japan seas in the 
Vestern Pacific, and in the Eastern Pacific from the equator to Cape St. Lucas in 
about latitude 23% N. It was found by Grayson very abundant on the surface 
hear the entrance to the Gulf of California. 
Cavolina longirostris Lzsurvm. 
Hyalaca longirostris Lesueur (MS.), in Blainville, Dict. Sci. Nat., 1821, 22, p. 81. 
Hyalaea limbata D'Orbigny, Voy. dans l'Am. Mérid., 1830, p. 101, pl. 6, figs. 11-16. 
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 3499, off Acapulco, Mexico. 
General distribution, in the Atlantic, from about latitude 499 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 28° N. to latitude 12° $. 
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 X 2.25 mm. in 
length and width. 
While discussing the pteropods, it may be mentioned that Olio 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. 
TEOTIBRANCHIATA. 
Acteonidae. 
ACTEON MONTFORT. 
Acteon Montfort, Conch. Syst., 1810, 2, p. 314; type Voluta tornatilis Gmelin ; not 
Acteon Fleming, 1828, or Actaeon Oken, 1815. 
