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somewhat fewer and less differentiated. The penis is small and simple and of an embryonal
appearance, resembling somewhat the simple type in the genus Philomedes. The furca has
only nine claws, which in most cases decrease fairlv uniformly in length the more proximallv
they are situated. The lateral eyes, the median eye and the rod-shaped
organ are well developed.
Female: This too is very like the mature stage. Shell: Average length, 2,1 mm.;
length: height = about 1,5: 1. Ail the liinbs are well developed; the posterior ones are
of about the sanie type as in the male of this stage. The furca has eleven claws — i. e. the
same number as in the mature stage — decreasing in most cases fairly uniformly in length the
more proximally they are situated. The lateral eyes, the median eye and the
rod-shape d organ are well developed. The character by means of which this stage is
most easily distinguished from the mature stage — apart, of course, from the size — is the
1 arval appearance of the tissues.
Stage II: — I was not successful in distinguishing with certainty between males and
females in this stage by means of dissection; this may be due to the faet that the sexual characters
have not yet begmi to develop or that all the specimens investigated were actuallv females.
Shell: Average length, 1,75 mm.; length: height = about 1,5:1. With regard to the
limbs it need only be mentioned here that they were all well developed, but they had,
especially the posterior ones, a still more larval appearance than in the preceding larval stage;
thus the cleaning limb — although it had proportionately about the same size as in the mature
stage — is armed with only about half the number of cleaning bristles. Each f u r c a 1 1 a m e 11 a
is armed with only nine claws, in most cases decreasing fairly uniformly in length the more
proximally they are situated. The lateral eyes, the m e d i a n e y e and the r o
d-shaped organ are well developed.
Stage III: — Shell: Average length, 1,4 mm.; length: height — about 1,5:1.
All the limbs are developed in tiris larval stage too, but the cleaning 1 i m b is only
represented by an upward pointing appendage that is certainly rather long, but very slightlv
differentiated; it has no cleaning bristles at all. The s i x t h limb, although of about
the definitive shape, is of a decidedlv larval type; along the ventral margin of its end joint there
are, for instance, only six bristles, three anteriorly on the joint and three posteriorlv; the former
are separated from the latter by a sharply marked gap. 0 t h e r limbs also have about
a definitive shape, while at the same time they present features that are even more larval than
in the preceding stage. Each fure a 1 lamella is fumished with eight claws, of which
the fourth is relatively short and weak, the others decreasing almost uniformly in length the
more proximally they are attached (note that only one specimen of this stage was investigated;
among larvae belonging to Stage I and Stage II single individuals were also observed with the
fourth furcal claw comparatively short and weak). The lateral eyes, the median
eye and the rod-shaped organ are well developed; the median eye, however,
has rather weak pigmentation.
Stage IV: — Shell: Average length. 1,2 mm.; length : height = about 1.5:1.
In this larval stage too all the limbs are present, the cleaningli m b exists, however, only
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