NEW BARNACLE GENUS—UTINOMI 461 
developed than corresponding ones in the related genera Laura and 
Baccalaureus and are two-segmented. In the anterior five pairs, 
which are subequal in size, the pedicel is elongate and sticklike and 
7 a : 
| 02mm = 
Ficures 7—8.—Gorgonolaureus bikiniensis: 7, Metanauplius, ventral view; 8, metanauplius, 
dorsal view. 
contains the “testes” (fig. 4). The distal segment is shorter and 
slender and bears long setae, at least two in each pair. It is, however, 
problematic at present whether they are uniramous as in Baccalaureus 
or biramous as in Ascothorax (Djakonov, 1914; Stephensen, 1935). 
Apparently there is no trace of the ‘penis’ at the posterior end of the 
thorax. 
In the mantle cavity of the holotype specimen, at least 14 or 15 
well-developed metanauplius larvae lay dorsally to the body and 
were supported by the filamentary appendages from both sides (fig. 
4). 
As figured here in magnification (figs. 7, 8), the metanaupli are 
two-shelled like the larvae of Ulophysema éresundense (Brattstrém, 
1948a). They are approximately 0.59 mm. long and 0.47 mm. wide. 
The carapace or dorsal shield is coalesced in the median line and is 
elliptical but somewhat broader in the anterior than in the posterior 
half; the anterior end is slightly concave, the posterior end strongly 
notched. The three original pairs of naupliar appendages are at 
the ventral side of the anterior part of the dorsal shield, although the 
posterior two (antennae and mandibles) are only slightly traceable. 
The posteroventral part of the body projects posteriorly as an ab- 
dominal protrusion. The whole median part of the ventral side is 
thickened and indistinetly folded into six segments which will be the 
swimming legs of later stages. The terminal furea were unusually 
protruding. 
623408—62 
