iL 
small sharp lateral tooth or spine; length of the male carapace 
0°318 of an inch, and its breadth at the bases of the chelipeds 
the same. For H. orbiculare, which was abundant, he refers 
us simply to Desmarest, Consid. gén. Crust., p. 163, Pl. 26, 
fig. 1, and Milne-Edwards, Hist. Nat. Crust., Vol. II., p. 36. 
The figure of the maxillipeds by Desmarest gives the third 
joint decidedly shorter than the fourth, but in his Atlas of 
Crustacea to the Regne Animal of Cuvier, Pl. 35, fig. 1, Milne- 
Edwards allots the advantage in length to the third joint. 
In both figures the stem of the exopod appears to fall con- 
siderably short of the apex of the fourth joint. In the 
specimen from False Bay which I have examined, the two 
joints are equal in length, including in the measurements the 
rather large tooth at the inner apex of the third, and the much 
smaller tooth at the outer apex of the fourth joint. The stem 
of the exopod reaches at least to the end of the last named 
tooth. The fourth joint in this species is transversely, not at 
all obliquely, truncate, so far agreeing more nearly with 
Desmarest’s figure than with Milne-Edwards’. Of the pair of 
maxillipeds the two members are set widely apart. 
Milne-Edwards in his description of H. orbiculare includes 
two spiniform teeth on each side of the epistome, one formed 
by the anterior extremity of the lateral margin of the buccal 
cavern, the other by the external orbital angle. 
In the False Bay specimens there are two such teeth of con- 
siderable size, but the smaller, slenderer one, belonging to the 
buccal margin, lies so immediately beneath the other (which is 
a little granular at the base) that it may easily be overlooked. 
The still smaller but conspicuous hepatic (or subhepatic) tooth, 
which marks Stimpson’s species, is neither mentioned nor 
figured by Desmarest and Milne-Edwards for H. orbiculare. 
There is also in our specimens a distinct, upturned angle on 
each side of the base of the rostrum, which those authors neither 
allude to nor represent. On the other hand, the regional 
markings to which the specific name geometricum probably 
refers, are well shown in Desmarest’s figure of the earlier 
species. The ocular peduncle narrows from the base to the 
slightly bulging cornea. : 
Writers prior to Stimpson may have included two distinct 
forms under one name. We cannot, therefore, be sure that 
Krauss is really referring to H. orbiculare, when in the Siidafrik. 
Crust., p. 51, he declines to confirm Desmarest’s statement 
that the hands are smooth, “‘ for the males,” he says, ‘‘ have 
long-haired chelipeds and legs ; the much smaller females on the 
contrary chelipeds less hairy and almost smooth legs.’’ The 
