92 
PACIFIC SCIENCE, VoL IV, April, 1950 
a 
Fig. 12. Conus catus Hwass. a, Egg capsules 
attached to rock; b—d, cleavage stages; e, f, free- 
swimming veliger larva; g, h, veliger shell of free- 
swimming larva. 
attached to a rock with a Conus catus beside 
it was found near the Marine Laboratory. 
These capsules, of a pale straw color, were 
thin, semi-transparent, yet firm and rigid, 
measuring about 9 x 12 mm., and containing 
from 500 to 1,000 ova (Fig. 12^). 
The diameter of the zygotes averaged 0.2 
mm., and cleavage was similar to that ob- 
served in other species of the genus, Le., equal 
in the first and the second division, unequal 
in the third (Fig. 12 b, c, d) . 
The larvae attained the free-swimming 
veliger stage in 15 to 16 days, at which time 
the shell measured about 0.375 mm. in 
length. The velar lobes were of medium size 
with a lateral indention which partly divided 
them, but to a far less extent than in the veli- 
ger of C. omaria . The lobes were bordered 
by a continuous line of many pale green pig- 
ment spots which were increased in number 
at the extremities of the lobes so as to form 
two or three rows. Eyes were distinct with a 
rather short tentacle at the right eye. The 
mouth was marked by an elongate black 
streak on each side. The foot was somewhat 
narrow and pointed, bearing an operculum 
which extended well beyond it distally. Fine 
bristle-like processes were present (Fig. 12e, 
/). The shell was ovate and densely granu- 
late, consisting of about one spiral turn. Some 
of the shells had a faint reddish tinge on the 
outer lip (Fig. 12 g, h) . 
Conus hebraeus Linnaeus 
Fig. 13 
On March 22, 1921, a Conus hebraeus 
kept in the laboratory in a pan of water was 
found in the act of laying an egg case. Fur- 
ther inspection of the pan resulted in the dis- 
covery of other cases. The egg case being laid 
was partly held by the animal and was of a 
jelly-like consistency. Upon contact with the 
water, the capsular walls gradually hardened 
and it assumed the appearance of the other 
egg cases. The capsules were very pale straw- 
