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A. 11 representatives oi tliis la ni 11 y p r e s u ni alily g o through l’hc numbtr oj pust
seven postembryonal moults. At any rate the number of moults is not subject to enibnJ(>nal moulls
variation in this family, a result that is of the greatest importance in judging of BROOKS’s law.
Sub-order: //alocypr if ormes. Uaiocyprifurmr..
Conchoecia elegans.
AU the individuals described and measured below were caught at the same time and
at the same locality, on the Ist. of Feb., 1911 off the west coast of Sweden, S. Koster, at a
depth of 125 m.
Only two larval stages could be distinguished with certainty.
General description o f the larval stages: —
Stage I : —
Male: Shell: Average length, 1,74mm. It is of about the same type as that of
the mature female; cf. fig. 5 in the spécial part. The shoulder ridge is somewhat less distinctlv
marked. The r o d - s h a p e d organ is of about the same type as in the mature female,
shows about the same variation and projects almost the same distance beyond the first antenna
as in this sex. First antenna: The e-bristle is, as in the mature female, about twice as
long as the four other distal bristles; the latter are subequal or else the b- and d-bristles are
somewhat shorter than the a- and c-filaments; the b- and d-bristles are rounded distally and
somewhat narro wer than the a- and c-filaments, and unlike these. thev are annulated; the bristle
on the second joint is straight. Second antenna: This is like that of the mature female;
the c- and d-bristles are developed; laterally and somewhat distaUy of the latter there is a rather
powerful peg, see fig. 9 of this species in this work. The s i x t h 1 i m b has the same number
of bristles as in the mature stage; of the bristles of the end joint the middle one is somewhat
longer than the total length of the two distal joints, the two others are about a third or a
quarter shorter; the remaining bristles are more like those of the mature female than those
of the mature male. The se venth 1 i m b has the definitive type. The penis is about
of the same type as shown in fig. 17, pi. 34, G. \V. MÜLLER, 1894. The f u r c a has seven claws,
which decrease fairly uniformly in length and strength the more proximallv they are situated.
Female: S li c 11: Average length, 1,5 mm. It is of the same type as that of the
male in this stage. The r o d - s h a p e d o r g a n and the limbs are about the same as in
the mature female. The f u r c a is like that of the male in this stage.
Stage II :
Male: Shell: Average length, 1.13 mm. lt is relatively somewhat higher than in
the preceding stage; length : height about 2,25: 1. The shoulder ridge is scarcely developed
at all. The postero-dorsal corner of the sheU has a point that projects rather less, but the latter
is furnished with secondary teeth as in the preceding stage. The rod- s h a p e d o r g a n
is somewhat more siender than in the preceding stage. The first antenna has quite the
same type as in the female. The second antenna is the same as in the preceding
stage, but one of the c- and d-bristles is very small. S i x t h li m b: The three bristles of
the end joint liave about the same relative lengt lis as in the mature female; as in the last
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