dall: mollusca and brachiopoda. 235 



Cavolina uncinata Rang. 



Hyalaea uncinata Rang (MS.), in D'Orbigny, Voy. dans I'Ara. Merid., 1836, p. 93, 



pi. 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. S. N. Mus. 

 123,071 ; stations 3354 and 3392 in the Gulf of Panama ; and station 3398 off the 

 coast of Ecuador. 



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 Beugal ; the China and Japan seas in the 

 Western 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 

 near the entrance to the Gulf of Califoruia. 



Cavolina longirostris Lesueur. 



Hyalaea longirostris Lesueur (MS.), in Blainville, Diet. Sci. Nat., 1821, 22, p. 81. 

 Hyalaea limbata D'Orbigny, Voy. dans I'Am. Merid., 1836, p. 101, pi. 6, figs. 11-16. 

 Cavolina longirostra Gray, Cat. Moll. Brit. Mus., 1850, 2, Pteropoda, p. 8. 



U. S. 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 X 2.25 mm. in 

 length and width. 



While discussing the pteropods, it may be mentioned that Clio sulcata Pfeffer, was 

 obtained off Mauta, Ecuador, by the " Albatross " in 18S8 ; and Cavolina inflexa 

 Lesueur, and Limacina inflata Orbigny, were dredged off Cerros Island, Lower 

 California, in 1889. 



OPISTHOBRANCHIATA. 



TeCTI BRA NCHI ATA. 



Acteonidae. 



ACTEOI^r MONTFORT. 



Acteon Montfort, Conch. Syst., 1810, 2, p. 314 ; type Voltita tomatilis Gnielin ; not 

 Acteon Fleniiiijx, 1828, or Actaeon Oken, 1816. 



