Hawaiian Marine Gastropods — OsTERGAARD 
109 
Suborder nudibranchiata 
Family DORIDIDAE 
Genus Cryptodoris 
Cryptodoris sp. 
Fig. 36 
During the night of December 10, 1922, 
an egg ribbon was deposited in the laboratory 
by an animal of the genus Cryptodoris. This 
was a bright yellow ribbon of three volutions. 
It was about 4 mm. in width and filled with 
globular egg capsules, each containing an 
ovum. There were about 30 ova abreast in 
cross section. The ova were about 0.06 mm. 
in diameter (Fig. 36^ b) . 
As the embryos developed, the ribbon 
turned bright copper color and the free- 
swimming veliger stage was attained in about 
10 days. The shell at this stage was about 
0.12 mm. in length and of a bright copper 
color on the apical side of the columella. The 
veliger lobes were round with long cilia and 
the operculum prominent. No eyes were 
present but otocysts were. A larval muscle 
was clearly seen (Fig. 3 6c— g). 
Genus Glossodoris 
Glossodoris sp. 
Fig. 37 
In March, 1923, two animals of this genus 
were brought to the laboratory from Waia- 
nae. An egg ribbon was deposited by one of 
them during the night of March 17, 1923. 
This consisted of a flat white band about 4 
mm. in length and of one volution. About 
10 ova were seen abreast in cross section, 
each enclosed in a spherical capsule about 
0.14 mm. in diameter (Fig. 37a, b). 
Family HEXABRANCH1DAE 
Genus Hexabranchus 
Hexabranchus sp. 
Fig. 38 
On May 21, 1923, an egg structure was 
deposited in the laboratory by this beautiful 
nudibranch, several specimens of which had 
been kept living for months in aquarium jars. 
A few days after the first egg structure 
was found, a second and larger one with one 
volution more than the first was deposited by 
the mollusk. A study was made of the first 
structure. This was a bright scarlet to orange, 
0.5 mm. 
Fig. 37. Glossodoris sp. a, Egg ribbon; b, mag- 
nified section of ribbon showing arrangement of 
ova. 
Fig. 38. Hexabranchus sp. a, Egg ribbon; b, 
magnified section of ribbon showing arrangement 
of hyaline capsules and ova; c, d, free-swimming 
veliger larva: c, lateral, and d, ventral aspects. 
