104 
PACIFIC SCIENCE, Vol IV, April, 1950 
contained a continuous string of ova wound 
transversely in circular loops. It could not 
be determined how the ova adhered to one 
another in a string. It seemed as if they were 
enclosed in an invisible gelatinous tube. 
Each ovum was enclosed in an oval capsule 
and had a diameter of about 0.06 mm. (Fig. 
29a, b). 
Fig. 29. Bulla sp. a, Egg filament; b, section 
of filament magnified to show arrangement of ova; 
c, d, free-swimming veiiger larva: c, ventral, and 
d, partly lateral aspects. 
H amino ea crocata were brought to the lab- 
oratory from Waianae beach. Several egg 
filaments were laid by these animals. These 
filaments resembled those of the Bulla in 
8 mm. 
The development of the zygotes was ex- 
ceedingly rapid, the free-swimming veiiger 
stage being attained in 4 days. The larvae 
and shells were colorless and neither eyes nor 
otocysts were present (Fig. 29c d). 
Family AKER1DAE 
Genus Haminoea 
Haminoea crocata Pease 
Fig. 30 
On March 27, 1923, several specimens of 
Fig. 30. Haminoea crocata Pease, a, Egg fila- 
ment; b, section of filament magnified to show 
arrangement of ova. 
their external characters as well as in the ar- 
rangement of the ova. The wall of the fila- 
ment was thicker than in that of Bulla and 
each ovum was enclosed in a spherical cap- 
sule, instead of one of oval form as in Bulla. 
The diameter of the ovum was about 0.08 
mm. The filament was about 4 cm. in length 
and about 5 mm. in diameter (Fig. 30c b) . 
