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PACIFIC SCIENCE, Vol. IX, April, 1955 
groove conspicuous, extending from genital 
pore, between anterior margins of parapodial 
lobes, anterolaterad to base of right labial 
tentacle, where penis is located. Eyes, antero- 
laterad of rhinophores, conspicuous for their 
broad white rings. Body and head dark pur- 
plish brown with sprinkles of groups of fine 
white specks, particularly in region of para- 
podial lobes. Sole of foot cream yellow. When 
disturbed, the animal emits a purplish carmine 
fluid. Length of body 31 millimeters. 
Shell large, yellowish olive green, 8 milli- 
meters in length, deeply concave with prom- 
inent beak. Radial lines and growth lines 
distinct. 
Seven specimens of this color form were 
found near the Hawaii Marine Laboratory, 
Waikiki, during May, 1923, where some of the 
typically colored forms also occurred. It will 
be noted in the specimen described and fig- 
ured that the parapodial lobes are edged with 
black, and that rhinophores and labial ten- 
tacles are tipped with the same color. In some 
of the specimens this color was reversed, 
these areas being white instead of black. 
Description and figures of egg filament, 
cleavage, and veliger stage are given in Oster- 
gaard (1950: 100). 
Notarchus lineolatus (Gould) 
Fig. 5 
Stylocheilus lineolatus Gould, U. S. Expl. Exped., 
Moll., p. 225, pi. 16, figs. 270, 270a, 1852. 
Notarchus lineolatus Gould. Tryon and Pilsbry, 
Man. Conch. 16: 140, pi. 29, figs. 37-39, 
1895-96. 
Body from 2.5 to 4 centimeters in length, 
elongate, fusiform, tapering to acute point 
posteriorly. Parapodial lobes swollen and 
rounded, broadly united behind, almost meet- 
ing in front. Gills large and arched, convex 
posteriorly, concave anteriorly, bluish with 
fine brown veins and white specks; mantle 
very rudimentary, not covering the gills. Anal 
papilla long, slender. Anterior tentacles loose- 
ly involuted; from them a pair of small obtuse 
lobes extending posterolaterad of buccal disc. 
Rhinophores long, cylindrical, tapering slight- 
ly toward their extremities, slit in the distal 
half. Integument of rhinophores and anterior 
tentacles raised into small white or yellowish 
conical cirri. Similar, but larger, cirri occur 
throughout body region; largest at margins 
of parapodial lobes where some of them are 
branched. Foot slightly narrower than body, 
truncate anteriorly and tapering posteriorly 
to acute point. Foot pale bluish green, darker 
where viscera show through, marked through- 
out with numerous interrupted light brown 
striae, and in some specimens, especially in 
young individuals, sprinkled with minute 
white specks. Head, body, and dorsal surface 
of foot marked with fine, longitudinal, closely 
crowded, wavy, dark-brown lines, and with 
irregularly scattered ocelli whose pupils are 
blue with a dark brown ring and a light brown 
outer zone. 
In quite young animals the ocelli are want- 
ing, the dorsal striae are few and comparatively 
heavy, and the cirri are all unbranched. In 
specimens of 5.5 millimeters length, cirri may 
not be present. In intermediate stages of 
growth, the observed transition between 
young and adult seems to indicate that changes 
of color and structure take place gradually. 
When disturbed, the animal emits a clear 
bluish-purple fluid. 
The following is Gould’s description of 
Notarchus lineolatus: 
Animal elongated, delicately attenuated posteriorly, 
of a pale grass-green color, ornamented with longi- 
tudinal, parallel, contorted, rusty lines, and scattered 
ocelli of unequal size. The papillae of the mantle [he 
evidently mistook the parapodial lobes for the mantle] 
are branching. The anterior tentacles are short, tapering, 
and destitute of papillae. 
Length three and a half inches. 
Found on a coral reef at Honolulu, Oahu. 
The animals were found at Kawailoa, Oahu, 
during June, 1922, where they occurred in 
large numbers on seaweeds, upon which they 
appear to feed. A rather pale variety has been 
found at Waikiki. From Nanakuli, Oahu, 15 
specimens were obtained in March, 1921. 
