262 
and the rostrum, and the lower latera is far less than in the 
adult. 
The smallest specimen might very well be taken to be a young 
Calantica with its well developed latera — upper, carinal, and 
rostral latera are very conspicuous. — Already the next stage is 
more distant from Calantica; the lower latera are here separated 
by greater intervals and in growth already far behind the primary 
plates and the rostrum. 
A most interesting feature is observed in these two young 
specimens, viz. the irregular arrangement of the scales of the ped- 
uncle. In the smallest individual an arrangement in oblique series, 
somewhat recalling the small Mitella polymerus, is still to be faintly 
distinguished; but already in the other specimen no regularity can 
be detected in the arrangement of the peduncle scales, and judging 
from their size, we moreover must suppose that new scales in Mi¬ 
tella sertus are secondarily formed almost all over the peduncle. 
— In the smallest specimen the peduncle has a length of about 
one third of the capitulum; in the next specimen the peduncle is 
much narrower, but of the same length as the capitulum. 
Genus Ibla. 
Ibla quadrivalvis (Cuvier) Gray. 
Port Jackson; Coastal rocks. 20/X 14. One specimen of 14 mm total 
length with a furry coat of hairlike spines all over the ped¬ 
uncle. 
Ibla pygmæa n. sp. 
38° 12’ S., 149° 40’ E., 100—160 fathoms. „Endeavour" 16/IX 14. Num- 
erous specimens attached to the naked axis of a gorgonarian 
of the family I s i i d a e; together with Heteralepas morula, Oxy- 
naspis celata , Pachylasma scutistriata , and Balanus auricoma. 
Small animals with triangular terga and scuta; apex of the 
terga beaklike pointing forward. Peduncle with low, almost spine- 
like warts all over; some scattered hairs are especially found dors- 
ally, and a fringe of hairs adorns the peduncle along the margins 
of the capitulum plates; generally the triangular area between the 
scuta below the terga on the dorsal side is also somewhat furry. 
