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PACIFIC SCIENCE, Vol. IX, April, 1955 
been described by Pease, its feeding habit 
might also be mentioned as one of interest. 
The large oral veil is opened widely and 
placed with its free margin against a smooth 
surface; whereupon the slender marginal ten- 
tacles, aided by the constriction of the veil, 
gather the food particles (diatoms, etc.) to 
the mouth at the dorsoposterior wall of the 
velum. 
A description of the spawn and the veliger 
shell with illustrations is given in Ostergaard 
( 1950 : 111 ). 
REFERENCES 
Alder, J., and A. Hancock. 1855. A mono- 
graph of the British nudihranchiate Mollusca. 
[Without pagination.] Ray Society, London. 
Gould, A. A. 1852. Mollusca & shells. Vol. 
12. United States Exploring Expedition , etc. 
xv + 510 pp. [Atlas 16 pp. + 52 col. pis.] 
U. S. Govt, [printed by C. Sherman], 
Philadelphia. 
Ostergaard, J. M. 1950. Spawning and de- 
velopment of some Hawaiian marine gas- 
tropods. Pacific Sci. 4(2): 75-115. 
Pease, W. H. I860. Descriptions of new spe- 
cies of Mollusca from the Sandwich Islands 
(Bullina vitrea, B. lauta, Tornatina sand- 
wicensis, Haminea crocata, etc.). Zool. Soc. 
London , Proc. 28: 18-36. 
Souleyet, F. L. A., and J. F. T. Eydoux. 
1852. Mollusques. In Voyage autour du 
monde . . . sur ... la Bonite. . . . Vol. 2. 
Nudibranchiata. 663 pp. Arthur Bertrand, 
Paris. 
Tryon, G. W., and H. A. Pilsbry. 1893. 
Manual of Conchology. Vol. 15. 436 pp., 53 
pis. Academy of Natural Sciences of Phila- 
delphia, Philadelphia. 
and 1895-96. Manual of Conch- 
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