128 
PACIFIC SCIENCE, Vol. IX, April, 1955 
Doridopsis macfarlandi sp. nov. 
Fig. 13 
Body elongate with parallel margins, round- 
ed anteriorly and posteriorly. Cloak soft and 
devoid of spicules and with margins intensely 
folded. Rhinophores dark gray with white 
tips, rather stout, with about 15 lamellae on 
their distal half; arising from sheaths with 
slightly elevated simple margins and usually 
directed slightly anterolaterad. Oral shield 
light chocolate brown, square with rounded 
angles, and about half as wide as foot. Bran- 
chiae 12 in number, encircling anal papilla 
and separately retractile within cloak, each 
with a central stem from which branch and 
rebranch numerous lateral processes, dark 
gray. Foot rather narrow, rounded posteriorly, 
tapering anteriorly, where it is deeply notched 
and exposes the mouth, dark purplish brown 
posteriorly and light brown anteriorly with a 
narrow pale-blue margin, which is bounded 
anteriorly on its median side by a narrow 
dark-blue line. Dorsal surface light chocolate 
brown. Dorsal surface of cloak bluish black 
with numerous small, round, white spots de- 
creasing in size medially. 
Holotype (U.S.N.M. 574931) taken near 
the Blowhole below Koko Head Crater, Oahu, 
November 18, 1950, by Donald Strasburg. 
Length 3 centimeters, width 12 millimeters. 
The figure accompanying this description 
is of a paratype specimen which was found 
near the Hawaii Marine Laboratory at Wai- 
kiki in October, 1922, and which deposited 
an egg filament in the laboratory. 
At intervals this species has been found at 
the above sites, also at Kawailoa, Oahu. The 
various specimens agree very closely; but 
there appear also to be several closely related 
species, which need to be worked out ana- 
tomically in order to separate them. 
I have named this species for Dr. Frank M. 
MacFarland of Stanford University. 
The structures of egg filament and veliger 
larva are figured and described in Ostergaard 
(1950: 108-109) under Cryptodoris sp. 
Hexabranchus tinkeri sp. nov. 
Fig. 14, PL 2 
Body depressed, oval in outline when cloak 
is fully extended. A median area correspond- 
ing to the body region proper is variegated 
with bluish white, yellowish and reddish 
brown. Surrounding this area is a region of 
an equal width, softly colored with pale blue 
and carmine spots and reticulations. Beyond 
this area is one of similar width —a little 
narrower posteriorly and interrupted ante- 
riorly— of a pale carmine with radial muscle 
bands appearing as fine dark-red striae. The 
cloak is bordered by two narrow bands— an 
inner dark red and an outer pale carmine— 
both interrupted anteriorly. Rhinophores 
elongate, orange, tilted posteriorly. They con- 
tain about 40 laminae and are supported by 
stout carmine stalks, retractile into sockets 
with low white collars. Branchial plumes, 
seven in number— three anterior, two lateral, 
and two posterior— are imperfectly tripinnate 
and retractile, but not into orifices. They are 
pink with red ribs. A carmine ring encircles 
each gill. A conical white anal papilla is sit- 
uated posterior to the center of the branchial 
circle. Head small with a pair of deep orange 
oral tentacles extending from it, with their 
borders thrown into 8 or 10 intense folds and 
their greater diameter in lateral directions. 
The portion of the cloak anterior to the rhino- 
phores is variegated with white, or pale blue, 
and carmine; dorsal side of foot has similar 
color which merges into golden at the margin. 
Foot oblong, rounded at both ends, extended 
a little beyond cloak when animal is creeping. 
It is pale flesh with golden margins, which 
are approximated and crumpled when the 
animal is swimming. When the animal is at 
rest, the broad cloak margins are rolled up 
against the body. Swimming is effected by 
vigorous transverse flections of the body and 
undulating movements of the broad, thin 
cloak, which serves as fins. 
The holotype (U.S.N.M. 57492 6) was 
found at Waikiki, May 19, 1922, by Robert 
