Memoirs of the Indian Mitseum. [Vol. II, 



Capitulum broadly ovate, compressed ; the upper part of the occludent margin 

 more or less 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. Ter gum 

 relatively large, sub triangular, 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 

 Fig II.— D. rhino- of the capitulum and overlapping the basal disk of the carina at 

 ceros, X 23. g-^j^gr gi(ie 



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 appendages 

 long and slender, reaching considerably beyond the distal end of the pedicel of the 

 sixth cirri, narrow^ly 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. — Labnim hnUate. 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. 



