112 
PACIFIC SCIENCE, Vol. IX, April, 1955 
Family Hydatinidae 
Genus Hydatina 
( H . physis ) • 
Family Aplysiidae 
Genus Tethys 
(T. elongata ) 
Genus Notarchus 
(N. lineolatus ) 
Genus Dolabella 
(D. variegata ) 
Family Pleurobranchidae 
Genus Pleurobranchus 
(P. delicatus ) 
Suborder Ascoglossa 
Family Placobranchidae 
Genus Placobranchus 
(. P . ianthobapsus) 
Family Elysiidae 
Genus Elysia 
(E. elsieae , E. degeneri , E. nealae) 
Suborder Nudibranchiata 
Tribe Holohepatica 
Family Dorididae 
Genus Glossodoris 
(G. prismatica lineata ) 
Genus Doridopsis 
(D. macfarlandi) 
Family Hexabranchidae 
Genus Hexabranchus 
(EL, tinkeri , Id. aureomarginatus) 
Tribe Cladohepatica 
Family Aeolidiidae 
Genus Aeolidia 
(A. edmondsoni) 
Family Fimbriidae 
Genus Melibe 
(M, pilosa ) 
Atys semistriata Pease 
Fig- 1 
Af/yr semistriata Pease, Zool. Soc. London, 
Proc. 1860: 20. 
Atys semistriata Pease. Tryon and Pilsbry, Man. 
Conch. 15: 267, pi. 28, fig. 30, 1893. 
A living specimen of Atys semistriata was 
obtained off the Hawaii Marine Laboratory 
at Waikiki in August, 1921. During its cap- 
tivity this specimen deposited an egg mass, 
which has been described and figured, in- 
cluding the veliger larval stage (Ostergaard, 
1950: 105). 
When the animal is active and fully ex- 
tended, it is 13 millimeters in length. Head 
shield broad, truncate anteriorly, bilobed 
posteriorly, lobes small and rounded. Epi- 
podial lobes extending over anterior half or 
body, meeting middorsally to cover anteriof 
part of shell. Foot bilobed; anterior portion 
truncate and larger than posterior portion, 
which tapers to a broadly rounded extremity. 
Color pale bluish white and peppered with 
minute black specks. Mantle, visible within 
the semitransparent shell, also pale bluish 
white with crowded masses of well-defined 
longitudinally elongate carmine spots. Eyes 
conspicuous, located between lobes of head 
shield. 
The description of the shell by Pease is as 
follows : 
"Shell oval contracted posteriorly, thin, 
fragile, pellucid, white, transverse raised lines 
at both ends; aperture slightly dilated at the 
base; apex perforate.” 
Haminoea crocata Pease 
Fig. 2 
ELaminoea crocata Pease, Zool. Soc. London, 
Proc. 1860: 19. 
ELaminoea crocata Pease. Tryon and Pilsbry, 
Man. Conch. 15: 363, 364, pi. 40, fig. 3, 
1893. 
From a group of seven specimens of living 
animals collected during March, 1923, at Wai- 
anae, Oahu, a description of the external parts 
of this vividly colored animal is as follows: 
Animal somewhat .fusiform, truncate an- 
teriorly and bluntly pointed posteriorly. Ce- 
phalic disc large, truncated anteriorly, bilobed 
posteriorly, lobes long with rounded extrem- 
ities. Eyes minute, located anterolaterad of 
anterior division of cephalic lobes. Epipodial 
