Cirripeds from Ogasawara — UTINOMI 
95 
Fig. 2. Calantica ( Paracalantica ) ikedai subgen. et sp. nov. : a, mandible, X 125; b, maxilla I, X 125; c, 
maxilla II, X 55; d, lower part of cirrus VI, with penis and caudal appendage, X 30. 
consisting of a large capitulum with six valves 
and a short peduncle, it differs somewhat. Of 
the valves, two scuta, one rostrum, and one 
carina are extremely large and triangular, while 
two terga are rather rudimentary and oval in 
outline. The carina is not visible from outside, 
in situ , being situated basally below the scuta. 
The peduncle is wholly buried in the cuticle 
of the hermaphrodite. It is about 1 mm. long 
and 1.3 mm. wide. 
Measurements in mm.: 
Length of capitulum 17 
Length of peduncle . ..11 
Basal breadth of capitulum 8 
Locality : Ogasawara Islands. Depth unknown. 
One specimen on a gorgonian stem. Aug. 1, 
1938, Ikeda leg. 
Remarks: The general outline of this cirriped 
is more like that of the genus Smilium than that 
of Calantica, the capitulum being not Mitella- 
like but Scalp ellum-like in form. However, the 
upper latus is entirely lacking, a condition not 
dependent entirely on accidental reduction be- 
cause of its special environmental location. The 
upper whorl of valves consists of the paired 
scuta and terga, and a closely fitting carina, the 
tergum occupying the whole of the space be- 
tween the scutum and carina, as in Calantica; 
the lower whorl consists of only two pairs of 
latera, a rostrum and a subcarina, all being well 
developed. The scutum is triangular in form as 
in Calantica, but has the subcentral umbo. The 
subcarina is extraordinarily larger than the ros- 
trum, instead of being somewhat smaller as in 
Calantica. The peduncular scales are wholly 
