76 
25 families of 3 orders. A key is furnished 
to aid in the identification of the spawn. 
Material collected and in the author’s pos- 
session consists of egg structures preserved in 
formaldehyde and balsam mounts of cleavage 
stages and veliger shells on slides. 
Acknowledgments: The author feels in- 
debted to a number of persons for their aid 
and encouragement in the present undertak- 
ing. Thanks are due Dr. Charles H. Edmond- 
son for his fine cooperation in securing spec- 
imens of mollusks from which spawn were 
obtained. I also wish to thank Mr. Otto 
Degener for having rendered much assistance 
in procuring living specimens of opistho- 
branchiate mollusks. I greatly appreciate Dr 
Robert W. Hiatt’s very helpful suggestions 
and aid in the preparation of the manuscript. 
Finally, 1 am greatly indebted to Florence 
Lambeth for the painstaking skill with which 
she adapted the drawings for reproduction. 
KEY TO THE SPAWN OF SOME 
HAWAIIAN MARINE GASTROPODS 
1. Egg structure consisting of dis- 
tinct, attached capsules with 
parchment- like walls or a 
continuing filament 2 
Egg structure otherwise, more 
or less aberrant 23 
2(1) Egg structure capsular with 
compact parchment-like walls 
3 
Egg structure consisting of a 
continuing filament 5 
3 (2) Capsules small, 1.5-4 mm. in 
length, pale yellow 4 
Capsules large, 8x10 mm. to 
13x15 mm., squarish, flat and 
baggy, more or less corru- 
gated marginally; attached to 
rock at basal margin or to 
one another ( Conus omaria, 
p. 90 ) ; with elongate slit at 
distal margin which is closed 
during incubation. Color pale 
yellow or pink. . . Conus, p. 89. 
4(3) Capsules oblong, rounded or 
PACIFIC SCIENCE, Vol. IV, April, 1950 
pointed; adhering to one an- 
other in compact masses. Egg 
mass covered by foot of ani- 
mal during incubation. Color 
pale yellow. . . Cypraea, p. 78. 
Capsules elongate, pointed; at- 
tached to substratum ..... 
Mitra, p. 86. 
5 (2) Egg structure a cylindrical fila- 
ment 6 
Egg structure a ribbon or band . 15 
6(5) Filament long, thin and tangled 
7 
Filament short, thick and not 
tangled 10 
7 (6) Filament from 0.5 mm. to 1 
mm. in diameter 8 
Filament about 0.25 mm. in di- 
ameter, thread-like, compris- 
ing many separate threads 
forming a bundle spread over 
4 square cm. Color pale yel- 
low. Strombus maculatus, p. 95. 
8(7) Filament of great length, about 
1 mm. in diameter, adhering 
in a compact mass, attached 
to underside of rocks and 
spread over an area of 25 
square cm. Color pale yellow 
when freshly laid, brown 
when embryos are near hatch- 
ing Tethys grandis 
and T. bipes, pp. 98, 99. 
Filament not of great length, 
occupying an area from 2 to 
4 square cm. Color pale yel- 
low 9 
9(8) Filament compactly tangled and 
attached to substratum .... 
Clava obeliscus, p. 95. 
Filament loosely looped or tan- 
gled and festooned on algae . 
Tethys elongata, p. 100, and 
Notarchus striatus, p. 101. 
10 (6) Filament with ova transversely 
arranged in loops within, and 
visible to the unaided eye ..11 
Filament without transversely 
arranged ova 12 
