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PACIFIC SCIENCE, Vol. IX, April, 1955 
green to dark brown surrounded by a white 
iris. Posterior end of foot and anterior margin 
of oral hood bordered with purple. Anteriorly, 
foot partly divided into a triangular, laterally 
extending lobe with a few ocelli on posterior 
portion of its ventral surface; ocelli on dorsal 
side resembling those of second type. Pos- 
terior region of foot unmarked and merging 
into a very pale bluish green, extending to its 
purple border. Length of animal 5 centimeters. 
The following is Gould’s description: 
Body elongated, in the form of a three-sided prism, 
terminating abruptly, as if torn off behind. Head broad, 
heart-shaped in front, lip edged with violet; tentacles 
involute, as if formed by an extension of the angles of 
the hood; ochreous tipped with white, annulate with 
violet near the lip [tip must have been intended for 
the word lip], retractile at tip. Colour of the back 
yellowish, shaded with olive, ornamented with two sets 
of ocelli, the larger in two series of eight on each side, 
with a blue pupil and white iris, and numerous smaller 
ones with orange pupil and white iris; foot not distinct 
from the body except in colour, emerald green, with 
the blue and orange ocelli smaller, and more nearly 
equal in size than those of the back. Margins of the 
body dilated and folded upon the back; branchial folds 
grass-green, radiating from the cardiac swelling behind 
the head. 
Length two and a half inches; breadth five-eighths 
of an inch. 
Found upon a coral reef at Honolulu, Sandwich 
Islands. 
A study of his figures, alone, would lead 
me to conclude that Gould’s species is differ- 
ent from mine; but, from the reading of his 
description, which clears up defects in the 
figures, I am led to believe that they are 
identical. 
habitat: On mud flats at Coconut Island, 
Kaneohe Bay, Oahu, where many specimens 
have been obtained from time to time. Spec- 
imens have been obtained from Kahala, others 
from the Island of Molokai, the latter being 
but half the size of those found in Kaneohe 
Bay. 
All specimens obtained agree closely in 
structure and coloration, and they seem to 
show no seasonal fluctuation in their oc- 
currence. 
The spawn and larval stage is described and 
figured in Ostergaard (1950: 107-108). 
Elysia elsieae sp. nov. 
Fig. 9, PL 1 
Body slender, elongate, tapering posteriorly 
to an acute point. Parapodial lobes thick and 
wavy. Rhinophores long and of equal di- 
ameters, curved anterolaterad with extremities 
directed laterally. Eyes very prominent, placed 
posterior to lateral base of rhinophores. Foot 
truncate anteriorly and tapering to acute point 
posteriorly. Head shield continuous laterally 
with rhinophores. Penis on right side about 
one-fourth distance from anterior end. Mouth, 
somewhat indistinct, located on head shield 
near its ventral margin. Color of body and 
foot pale bluish green; foot flecked with 
white. Body and both surfaces of parapodial 
lobes crowded with white and with black 
round spots of various sizes. Margins of para- 
podial lobes edged with pale pinkish carmine 
bordered with golden yellow and dark-green 
lines. Rhinophores pink with an irregular 
band of carmine near base and with purple 
extremities; within, pink color is heavily pep" 
pered with minute black specks. Similar pep- 
pering found on head shield. Heart, as prom- 
inent swelling, appearing between anterior 
ends of parapodial lobes. 
Length of animal 15 millimeters, width 2.5 
millimeters. 
Holotype (U.S.N.M. 574928), May 1924, 
off Hawaii Marine Laboratory, Waikiki. 
The figures are made from what appears to' 
be an immature specimen, obtained in June, 
1922, off the Hawaii Marine Laboratory, Wai- 
kiki, and which was about half the length of 
the many other specimens gathered later from 
the same locality, where they were abundant 
during the summer of 1924 in shallow water 
close to shore, on algae or on the sand. 
I have named this beautiful little species 
for my daughter Elsie for the interest and 
enthusiasm she showed in my pursuit of its 
study. 
In some specimens, the larger black spots 
appear as thick rings with small white pupils. 
In others, the white spots on the lateral sides 
