NEW BARNACLE GENUS—UTINOMI 459 
Gorgonolaureus bikiniensis, new species 
Ficures 1-9 
Tyrer specimens: Holotype with metanauplii, cut off into halves, 
USNM 107150. Paratype, total animal wholly buried in the bark 
of a Holaxonian gorgonid Paracis squamata (Nutting), USNM 107151. 
Type Locauiry: Off Enyu Pass, Bikini Atoll, Marshall Islands, 
Micronesia, 700-725 feet (dredged), Aug. 22, 1947. 
Description: The animal, presumably hermaphrodite, is very small 
in comparison with the other ascothoracids, measuring about 2.12 mm. 
in length and about 1.94 mm. in width. 
Its saclike mantle (figs. 1, 2) is somewhat compressed laterally, 
rather globular anteriorly and subtruncate posteriorly. The mantle 
(fig. 1) opens on the upper side of the subtruncate and somewhat com- 
| 1} OF mm 
Ficure 4.—Gorgonolaureus bikiniensis, inner body of the holotype (ad, adductor muscles; 
cf, caudal furca; fa, filamentary appendage or “horn”; m, metanauplii; mo, mantle opening; 
ov, ovaries; t, ‘‘testes’’). 
pressed posterior half and is rather large, in a slit form. The outer 
surface of the mantle (fig. 3) has many simple spinules, as in Bacca- 
laureus japonicus (cf. Broch, 1929, fig. 2). 
The body proper within the sac, which is relatively large, may be 
divided into three regions (figs. 4, 6), prosoma, thorax, and abdomen. 
The anterior part of the body is much swollen and filled with a bulky 
mass of ovaries (fig. 4). The oral cone (and the antennules too, if 
any) could not be well defined, but a number of strong adductor 
