118 
PACIFIC SCIENCE, Vol. IX, April, 1955 
These ranged in length from 12 to 57 milli- 
meters. The figured example is 32 millimeters 
in length. 
These mollusks are very prolific egg layers 
during June and July, at which time they 
festoon their pale-green thread-like filaments 
on every object with which they come in 
contact. 
A description of the spawn, development, 
and veliger stage of this species is given in 
Ostergaard (1950: 101-102). In that publica- 
tion the species has been erroneously named 
Notarchus striatus Quoy and Gaimard, which 
it resembles quite closely. 
Dolabella variegata Pease 
Fig. 6 
Dolabella variegata Pease, Zook Soc. London, 
Proc. 1860: 22. 
Dolabella variegata Pease. Tryon and Pilsbry, 
Man. Conch., 16: 155, 156, pi. 28, figs. 
33-36, 1895-96. 
Animal oblong, conical, tapering anterior- 
ly, obliquely truncate posteriorly. Head and 
body covered with small acute tubercles, 
which are scabrous and furnished with pale, 
soft cirri. Parapodial lobes closely appressed, 
the left tending to overlap the right, leaving 
two dorsal openings— one a little anterior 
to point of truncation, other at center of body. 
Rhinophores stout, involute, and open lat- 
erally. Oral tentacles short, stout, dilated dis- 
tally and open laterally. Eyes located antero- 
laterad to rhinophores. Foot truncate ante- 
riorly and obtusely rounded posteriorly, 
widest one-fourth distance from posterior end. 
Greenish olive, variegated with brown, white, 
and green. Foot greenish brown, clouded with 
olive green, evenly sprinkled with fine, round, 
pale-brown spots. 
Dorsal aspect in Figure 6 of a specimen 17 
centimeters long with a transverse diameter, 
at its widest part, of 8 centimeters, other illus- 
trations taken from smaller specimens. 
Specimens with a green coloration predom- 
inating have been found at Waikiki. 
Shell hatchet-shaped, strongly curved with 
one nuclear convolution from which a fold 
extends around the apex. Proximal margin 
broad; growth lines numerous, fine. Color 
yellowish white and pink toward apex. Length 
30 millimeters, width of proximal border 21 
millimeters. 
Pleurobranchus delicatus (Pease) 
Fig. 7 
Pleurobranchus delicatus Pease, Zool. Soc. Lon- 
don, Proc. 1861: 245. 
Pleurobranchus delicatus Pease. Tryon and Pils- 
bry, Man. Conch., 16: 202, pi. 45, figs. 
7-9, 1895-96. 
Animal delicate, subpellucid, cloak smooth, 
oblong oval, rounded at both extremities, 
transversely convex. Foot, elongate oval, may 
or may not extend beyond cloak. Rhino- 
phores rather short, involute, with truncate 
extremities. Oral veil triangular with anterior 
border straight and of greatest width, narrow- 
ing gradually toward head. Eyes placed on 
dorsolateral side of head and near base of 
rhinophores. Branchial plume on right side 
of body, nearly half as long as animal, bi- 
pinnate, with about 28 pairs of pinnules; pink. 
Genital apertures distinctly separate, near an- 
terior end of body on right side. Length of 
body 44 millimeters, width 22 millimeters. 
The shell is small and corresponds well with 
the description given by Pease, which I quote 
here: 
Shell small, rather solid, subpyriform, elongate, nar- 
row posteriorly, rounded in front, slightly flexuous; 
surface rough and marked with prominent lines of 
growth; nucleus spiral, anterior portion stained with 
violet, posteriorly white or light horn color. 
The color of the cloak is bright orange; 
that of the foot, rhinophores, and oral veil is 
pale pink bordered with orange. The dark- 
colored viscera may be seen through both 
foot and cloak. 
Four specimens were found off the Hawaii 
Marine Laboratory at Waikiki in October, 
1922. An additional four specimens were 
