ii8 
Memoirs of the Indian Museum. 
[VOL. II 
Fig II. — D. rhino- 
ceros, X 23. 
Capitulum broadh^ ovate, compressed ; the upper part of the occludent margin 
more or Jess lobate ; the base rounded. Carina moderately narrow, 
concave internally, arched, expanded at the base into a short oval 
disk, which is imbedded in the membrane and lies parallel to the 
base of the capitulum ; the lateral faces at the base concave, with a 
distinct ridge above on the sides of the inner margin. Tergum 
relatively large, subtriangular, almost vertical, the umbo facing 
the dorsal edge of the capitulum ; the carinal margin curved, the 
scutal margin with two deep, broad excavations, of which the 
one corresponding to the occludent segment of the scutum is the 
narrower. Scutum with a basal transverse branch from which two 
vertical branches arise close together ; the occludent branch usually 
narrower and longer than the carinal one ; both vertical branches 
widely separated from the carina, their bases curved, not angular ; 
the basal transverse branch extending almost to the carinal margin 
of the capitulum and overlapping the basal disk of the carina at 
either side. 
Peduncle usually short, bearing rings of very minute chitinous plates. 
Cirri, etc. — Posterior cirri slender, moderately short, not much curved ; the 
bristles on their anterior margin slender but stiff, definitely arranged in a double ver- 
tical row, consisting of from five to eight pairs of bristles on each segment ; the pos- 
terior terminal bunches of bristles well developed even on the proximal joints of the 
rami. First pair of cirri not widely separated from the others, at least three-quarters as 
long as the second, slender, with long pedicels ; the rami subequal. Anal appe^idages 
long and slender, reaching considerably beyond the distal end of the pedicel of the 
sixth cirri, narrowdy rounded at the tip, bearing a row of long bristles, some of which 
are longer than the appendage, on the external end of the posterior margin and the 
tip. Penis moderately long, slender, pointed, not distinctly annulated. 
Mouth parts. — Labrum bullate. Palpi broadly conical, large, bearing a few short 
bristles at the tip. Outer maxilla broadly oval, almost truncate; its external surface 
covered with long delicate bristles. Maxilla with a deep but narrow excavation. 
Mandible small, the outer tooth not very large or very widely separated from the 
others, which are small and usually number four including the inner angle. 
A very small species, the capitulum of adults which contain eggs measuring only 
about 2 mm. in length. 
This species was found on the gills of several specimens of the crab Encephaloides 
armstrongii dredged in the Bay of Bengal at a depth of between 65 and 93 fathoms. 
It does not appear to be a common species. The shape of the scutum, with its three 
branches, resembles that of D. forrestii (Stebbing) from the Coast of Florida and 
the West Indies. Apart from anatomical differences, however, the tergum occupies 
a much greater part of the surface of the capitulum in the Indian than in the 
Atlantic species. 
