96 
PACIFIC SCIENCE, Vol. IV, April, 1950 
maze of very fine pale-yellow threads of vari- 
ous lengths, tangled and glued together as if 
they were one continuous coil. When mag- 
nified, the thread proved to be a cylindrical 
gelatinous tube with a single row of ova 
placed in its center and strung out like a 
single strand of beads, each ovum being sur- 
rounded by a globular membrane. 
The diameter of the filament was about 
0.25 mm., that of the membrane 0.13 mm., 
and that of the ovum about 0.10 mm. (Fig. 
17 a, b, c ). The zygotes died at the morula 
stage. 
Family MURICIDAE 
Genus Morula 
Morula dumosa (Conrad) 
Fig. 18 
On July 1, 1923, an egg filament was laid 
in the laboratory by a specimen of Morula 
dumosa which had been kept for some time. 
This was a white, cylindrical filament of 
about two volutions and of about 25 mm. in 
length. The walls of the coil were fairly thick 
and the cavity was packed with ova. Each 
ovum was enclosed in a hyaline envelope of 
0 0.1 02 0.3 mm. 
Fig. 18. Morula dumosa (Conrad), a, Egg fila- 
ment; b, section of filament magnified; c, d, free- 
swimming veliger larva: c, ventral, and d, lateral 
aspects. 
a circular to oval shape, the ovum within 
measuring about 0.03 mm., therefore among 
the smallest recorded in this paper (Fig. 
18 a, b). 
The free-swimming veliger larva was of a 
pale-brownish tinge with a large black pig- 
ment spot near the base of the foot. Otocysts 
were present but not eyes. The veliger lobes 
were round and bore large cilia. Foot and 
operculum were well developed (Fig. 18c ; d). 
Family DOLIIDAE 
Genus Tonna (= Dolium) (Linnaeus) 
Tonna perdix (Linnaeus) 
Fig. 19 
On June 22, 1924, Ted Dranga, an expe- 
rienced diver and collector of marine organ- 
isms, located near Kapapa Island, Kaneohe 
Bay, what appeared to be the egg structure 
of Tonna perdix. There were several of these 
structures about 3 meters from a group of the 
mollusks. The largest egg structure was nearly 
circular in form with a diameter of about 
15 cm. and with a thickness of about 2 mm. 
An indentation of about 6 cm. occurred at 
one side, by which the structure had its at- 
tachment, so the form of it is not unlike that 
of a leaf of a pond lily. 
Within the thick parchment walls were 
3,076 egg envelopes, neatly arranged in semi- 
circular rows. These egg envelopes were cy- 
lindrical with rounded ends, measured about 
1x2 mm., and contained an average of 49 
ova. An estimate of the number of ova in 
the total structure is 150,724. The ova were 
rather large, averaging about 0.30 mm. in 
diameter, and were grouped together within 
their envelopes so as to form elongate masses 
with a constriction at the middle. They had 
a pale-orange tinge (Fig. 19 a, b). 
When the egg structures were brought to 
the laboratory, the zygotes were in early 
stages of cleavage. Some were probably in 
the morula stage, having four macromeres 
