Further Notes on Cirripeds from the Ogasawara Islands 
Huzio Utinomi 1 
In an earlier paper (Hiro, 1939) I described 
three interesting species of cirripeds ( Smilium 
boninense Hiro, Pachylasma ecaudatum Hiro, 
and Balanus krilgeri Pilsbry) which had been 
collected by the late Dr. Hayato Ikeda in the 
Ogasawara ( Bonin ) Islands. The present paper, 
which deals with new material of his collection 
from the same locality, received recently through 
the courtesy of the Honorable Professor H. Oh- 
shima and Dr. S. Miyake, of the University of 
Kyusyu, may be regarded as a supplement. The 
material consists of five species, one of which 
seems to be new to science. 
I am greatly indebted to the gentlemen men- 
tioned above for placing the late Dr. Ikeda’s 
collections at my disposal. 
Calantica ( Paracalantica ) ikedai 
subgen. et sp. nov. 
Figs. 1, 2 
Capitulum with 11 valves, much compressed, 
scalpelliform-triangular and covered with a 
smooth, yellowish cuticle; occludent margin 
nearly straight and parallel to long axis of 
capitulum, carinal margin oblique to the latter. 
The 11 valves with apical umbones except a 
pair of scuta, white, wholly calcified, closely 
fitting, with fine growth lines. 
Scutum triangular, nearly as high as broad 
( ca. 6 mm. long and wide ) , with umbo slightly 
incurved at upper one-fifth of occludent mar- 
gin; occludent and tergal margins nearly straight 
and basal margin evenly convex. 
Tergum elongate, triangular, about three 
times as long as wide ( ca. 12 mm. long and 3.5 
mm. wide), oblique to long axis of capitulum, 
1 The author’s name was formerly Fujio Hiro. Seto 
Marine Biological Laboratory, University of Kyoto, 
Sirahama, Wakayama Pref., Japan. Manuscript re- 
ceived July 13, 1948. 
with nearly straight margins, end not reaching 
base of capitulum. (Its apex is partially dam- 
aged but probably bears the umbo at its pointed 
end, from which a slight ridge runs to the base. ) 
Occupying the whole space between scutum and 
carina. 
Carina extremely long ( ca . 16 mm. long and 
2 mm. wide), nearly straight and sharply 
pointed at end projecting beyond apex of ter- 
gum. Dorsal roof strongly arched along medial 
line, sides rather narrow. Basal end reaching 
upper level of subcarina. 
Rostrum prominently large, pyramidal, about 
twice as high as broad ( ca . 6.5 mm. long and 
3.2 mm. wide), and projecting outwards; upper 
or inner surface slightly hollowed out with a 
medial, narrow, deep groove and bordered on 
each side by a low lateral rib. Basal margin 
strongly concave. 
Rostral latus obliquely triangular, very large, 
about two and one-half times as wide as high, 
with blunt apex toward rostrum. Basal margin 
occupying more than half of the basal breadth 
of capitulum. 
Upper latus and inframedian latus absent. 
Carinal latus smallest of all valves, obliquely 
triangular, with apical umbo which curves to- 
ward scutum and overlies its baso-lateral mar- 
gin. Strong broad rib along scutal margin from 
apex to basal angle, which is overlaid by the 
rostral latus. Valve thus occupying narrow 
space between scutum and subcarina below 
tergum. 
Subcarina much stronger than rostrum, horn- 
like, strongly projecting beyond carinal margin, 
with incurved apex, from which two small ribs 
extend along inner margin on each side. Length 
ca. 8 mm. and breadth ca. 3 mm. Baso-scutal 
angle attached closely to baso-carinal angle of 
