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more than half as long as this joint; it lias a strong bend near the base (as shown in fig. 55,
pl. 4, A. oblonga, G. W. MÜLLER, 1894).
M a n d i b 1 e (fig. 9): — Protopodite; Basale: The backward pointing process
has the same number of bristles as in the female, but all of them except the dwarf bristles are
much weaker than those of the female and are almost smooth, with only short, fine, scarcelv
visible hairs. In the middle of the dorsal side of this joint there is only one bristle both on the
right and the lcft mandible; this bristle is in most cases somewhat more than twice the length
of the corresponding bristle in the female. Endopodite: First joint: The shortest of the
three ventral bristles is furnished at the middle with fine hairs scattered on all sides; these are
not quite so long as the long secondary bristles on the two other of these bristles. Second joint:
This has three proximal bristles of somewhat different lengths; the longest is about half as long
as the main bristle a, the shortest is in most cases somewhat less than half the length of the longest.
The medial cleaning bristles are considerably longer and somewhat more weakly equipped
than those of the female. They are also somewhat more numerous; the following numbers were
observed: six bristles in a distinct lower row, three to five bristles in a sparse and sonietimes
rather irregulär upper row. To judge from its position the anterior bristle in the upper row
certainly corresponds to the bristle „close to the main bristle b“ of the female. The end claw is
perhaps slightly shorter than that of the female.
The furca has nine claws, of which the six or seven anterior ones may be termed
main claws. The anterior ones are somewhat more decidedly bent than in the female (about
the same as in fig. 14 of A. curta).
The lateral ey es are somewhat larger than those of the female.
Remarks: — In all the samples in which more than one mature female occurred there
were to be fourni females with as well as without eggs or embryos: the first category was, however,
always in the majority.
The male and the female juvenes of the first larva 1 stage occurred in about the proportion
3 : 1 in the sample collected on the lst of March; in the other samples the male and the female
juvenes of this stage were about equal in number or the males were about twice as numerous as
the females. In the second larval stage too the males were stated to be in the majority.
Habitat: — Monaco: In the harbour, (t y p e -1 o c a 1 i t y); depth about 10 m.;
fine clay with detritus: 1. III. 1916: 3 mature males, 5 mature females and 25 juvenes in different
stages; R. M. S. 178 and 179. 8. III. 1916: 2 mature females and 20 juvenes in different stages;
R. M. S. 180. 5. IV. 1916: 1 mature female and 4 juvenes; R. M. S. 181. 19. IV. 1916: 2 mature
females and some juvenes in different stages; R. M. S. 182 and 183. (Auctor coll.)
Type specimen on slides in the collections of the R. M. S.
Occurrence of
mature females.
Proportion b e Uveen
males and females.
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