59 
Dynomene platyarthrodes, n.sp. 
Plate XVII. 
Almost the whole exterior of this species presents a coating, 
more or less dense, of peculiar club-shaped setae. The inflated 
distal part of these varies much in thickness, and the length of 
the pedicel is sometimes considerable, but sometimes so evanes- 
cent that there is nothing apparent but a little globular wart. 
In marginal fringes plumose setae are mingled with the others. 
The broadly triangular front is very strongly deflexed. It 
has a tubercle on its tip, and a not very conspicuous elevation 
at each side, between which and the upper orbital tooth there 
is formed a cavity. From the tooth the orbit curves round to a 
small tooth on the lower side, a large interval between this and 
the front being filled by the first and second antennae. The 
very prominent and inflated gastric region appears to be con- 
tinuous with the cardiac, but separated by a depression from 
the intestinal region. It is longitudinally grooved. Wide and 
deep depressions separate the median inflation from the inflated 
hepatic regions, which are themselves separated by a sulcus 
from the less swollen branchial areas. In contrast with the 
dorsal surface the under surface of the carapace is flattened, an 
irregularly-toothed ridge line running from the outermost tooth 
of the endostome at first transversely, then curving round and 
losing itself before reaching the branchial sulcus. The sternal 
sulci of the female, starting from between the bases of the fourth 
and fifth legs, almost meet on a slight elevation far up between 
the chelipeds. 
The pleon of the ovigerous female is trilobed, very strongly 
curved, bulging so as to exhibit the first three segments ina 
dorsal view. The telson, which is flatter than the preceding 
segments, is considerably broader than long, its apex angled but 
not produced. 
The eyes in the dried specimen are dark reddish-brown, the 
pedicels not elongate. The first antennae have an irregularly 
quadri-lateral first joint, distally widened, the two following 
joints comparatively smooth and cylindrical. The second 
antennae have the basal joint mimicking as usual a little chela 
with immovable fingers; the second joint, as in Dynomene 
filholi, Bouvier, is marked by the large lobe at the outer angle ; 
the two following joints are small; the flagellum reaches a 
little beyond the orbit. In the second maxillipeds the sixth 
and seventh joints are notably broader than the fifth. In the 
third maxillipeds, the third joint has a very thick, longitudinal 
brush of sete, and external to this the masticatory edge, 
bordered with a dozen spaced little horny tubercles. 
