Hawaiian Opisthobranchiates — Ostergaard 
dark green merging into pale green medially. 
Length of animal 19 millimeters, width 3 
millimeters. 
One specimen of this vividly colored little 
species, designated as the holotype (U.S.N.M. 
574929), was found at Waianae, Oahu, March 
26, 1923, by Otto Degener, for whom I name 
the species. Another specimen, 25 millimeters 
in length, was found at Hanauma Bay, Sep- 
tember 12, 1950, by Charles Cutress. This 
agrees with the type in external characters and 
coloration, but no algae, which give to the 
type its distinctive green color, were present. 
This commensal state may be subject to 
fluctuation. 
Elysia nealae sp. nov. 
Fig. 11, PI. 1 
Body slender, elongate, tapering posterior- 
ly. Parapodial lobes intensely folded, medi- 
ally directed folds meeting dorsally. Rhino- 
phores slender, straight, tapering toward 
extremities and directed anterolaterad. Eyes 
prominent, placed at posterolateral bases of 
rhinophores, each surrounded by a small 
white area. Foot slightly bilobed with a shal- 
low median notch anteriorly, and tapered to 
an obtuse point posteriorly. Mouth located 
at median margin of head shield. Pale green 
throughout with small white specks and fine 
concentrated masses of green algae, particu- 
larly conspicuous on parapodial lobes. Mar- 
gin of parapodial lobes and posterior tip of 
body greenish yellow. 
Length of animal 33 millimeters, width 4 
millimeters. 
One specimen, designated the holotype 
(U.S.N.M. 574930), was found on seaweeds 
near the Hawaii Marine Laboratory at Wai- 
kiki, November 24, 1923, by Marie C. Neal, 
for whom the species is named. 
This Elysia bears some resemblance to E. 
degeneri, but can easily be distinguished from 
the latter by its long, smooth, tapering ten- 
tacles, whereas those of degeneri are short, 
knobbed, and nontapering. The coloration of 
125 
the parapodial lobes also show a marked dis- 
tinction. The parapodial lobes of degeneri are 
Fig. 11. Elysia nealae n. sp., dorsal and ventral 
aspects (X 4). 
