Hawaiian Marine Gastropods — OsTERGAARD 
95 
C. bebraeus Linnaeus 
C. imperials Linnaeus 
C, lividus Hwass 
C. miles Linnaeus 
C, nanus Broderip 
C. omaria Hwass 
C. sumatrensis Hwass 
C tabitensis rattus Hwass 
0 I 2 cm. 
Fig. 16. Clava obeliscus (Bruguiere). a, Egg 
filament; b, portion of filament enlarged; c, section 
of filament highly magnified; d, e, free-swimming 
veliger larva: d, ventral, and e, lateral aspects; f, 
shell of free-swimming veliger. 
Family CERITHIDAE 
Genus Clava 
Clava obeliscus (Bruguiere) 
Fig. 16 
An egg filament of Clava obeliscus was 
deposited in a dish by a specimen of the moJ - 
lusk on March 28, 1922. 
The egg structure was a pale cylindrical 
filament about 0.7 5 mm. in diameter, twisted 
and coiled upon itself to form a tangled mass. 
The parchment- like walls of the filament 
were thick and fibrous. The filament con- 
tained a closely packed mass of ova, lying 
about five abreast in cross section. The ovum, 
measuring about 0.9 mm. in diameter, was 
surrounded by a hyaline membrane whose 
diameter was about twice that of the ovum 
(Fig. 1 6a, b, c) . Development was not in- 
vestigated. The embryos reached the free- 
swimming veliger stage in the short period 
of 6 days. The larva was of a pale straw color. 
Eyes were present, as well as otocysts; the 
veliger lobes were rather small, but the oper- 
culum was large and rounded. The shell was 
about 0.1 6 mm. in length and slightly pitted, 
much resembling that of the Cypraea veliger 
(Fig. 16^ e, /). 
Family STROMBIDAE 
Genus Strombus 
Strombus maculatus Nuttall 
Fig. 17 
In a dish containing two specimens of 
Strombus maculatus several egg structures 
were deposited on March 16, 1922. These 
egg structures, which were lying unattached 
on the bottom of the dish, consisted of a 
0 I 2 cm. 
Fig. 17. Strombus maculatus Nuttall. a, Egg 
filament; b, filament enlarged; c, section of fila- 
ment highly magnified. 
