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PACIFIC SCIENCE, Vol. IX, April, 1955 
of the parapodial lobes were elevated into 
conical papillae. The animals would often 
float at the surface of the water in an inverted 
position. 
The egg filament and development of the 
larvae are described and figured as Elysia sp. 
in Ostergaard (1950: 108). 
The species admits of comparison with 
Elysia lobata Gould (1852: 308, pi. 26, figs. 
405, 405a). 
Gould’s description is as follows: 
Corpus limaciforme, gracile, dilatatum, trilobatum, 
viirescens nigro-punctatum; palium utrinque flavo- 
marginatum: tentaculae elongatae. 
Animal slug-like, greenish, dotted with black and 
bordered with yellow; edge of the mantle expanded into 
a three-lobed lateral wing. Head small with very large 
and long tentacles, tipped with sky-blue; eyes situated 
laterally, a little behind the tentacles. In creeping it 
flaps downwards, at pretty regular intervals, its long, 
ear-like tentacles. There are no apparent branchial or- 
gans, not even the plaits along the back, as in Placo- 
branchus, to which it is otherwise evidently allied; the 
parts about the mouth seem to have been imperfectly 
figured. 
Length one inch. 
Found creeping on coral stems, like a small Doris, 
at Honolulu. Dr. Pickering. 
Both Gould’s description and figures of 
this species are inadequate, and it is therefore 
not possible to determine whether his species 
is identical to this. 
Elysia degeneri sp. nov. 
Fig. 10, PL 1 
Body elongate, rather slender, tapering pos- 
teriorly. Parapodial lobes thrown into about 
four folds. Rhinophores short, stout, cylin- 
drical, directed anterolaterad and slightly 
curved from base outwardly; beset with low, 
sharply pointed conical processes. Eyes lo- 
cated at posterolateral base of rhinophores, 
each surrounded by a white area encircled by 
a pale brown ring. Foot rounded anteriorly 
and tapered to blunt point posteriorly; capable 
of forming broad anterior lobe. Head shield 
rounded and slightly notched medially. 
Mouth situated on mid-ventral margin of 
head shield. Body, head, and foot yellowish 
white with numerous minute green bodies, 
apparently commensal algae; yellowish- white 
ground color of body merging with pale 
brown of parapodial lobes and of head, which 
have a reticulum of a darker brown. Margins 
of parapodial lobes ornamented with small, 
elongate brown bodies regularly spaced. Inner 
surface of parapodial lobes next to margin 
with narrow area of deep orange; beyond this 
Fig. 10. Elysia degeneri n. sp., dorsal and ventral 
aspects (ca. X 7). 
