146 Records of the Indian Museum. [VOL.V, 
hermaphrodite, that is to say to have the organs of both sexes 
well developed and functional. The males attached to them re- 
semble young hermaphrodites, so far as external appearance goes, 
in a more or less accurate manner. Asa rule they have the capi- 
tulum and the peduncle distinctly separated, and bear calcified 
valves on the former, the peduncle being devoid of calcareous 
plates The capitulum, however, never bears more than six valves 
(viz., a pair of terga, a pair of scuta, a carina and a rostrum), 
and even these may be occasionally absent. The external anatomy 
Fic. 1.—S. bengalense, male, x ca. 52: A. =antenne ; A.P, = anal append- 
ages ; M. = mouth parts; P.=penis; Sc. =scutum; 1—6 = cirri. 
of the body of the male closely resembles that of the young herma- 
phrodite, differing from that of the adult mainly in the follow- 
ing characters :—(1) the cirri are shorter and less distinctly 
curved, with the bristles and hairs fewer and exhibiting less differ- 
entiation ; (2) the mouth parts are more primitive, the labrum 
being relatively smaller, the teeth of mandible less distinctly 
separated and often fewer, the bristles on the maxilla more alike. 
If the maxilla is notched, this character is less evident in the male 
than in the hermaphrodite. The male has a well-developed penis, 
