280 SCALPELLUM VILLOSUM. 



Outer MaxillcB, with the spines on the inner edge 

 arranged into two groups. Olfactory orifices tubular and 

 prominent, with some long bristles near their bases. In 

 the mandibles having only three teeth, in the maxillae 

 being notched and in the lower part not being prominent, 

 and, lastly, in the bristles on the inner face of the outer 

 maxillae being arranged in two groups, these several 

 organs differ from those in the hermaphrodite. 



Cirri. — First pair short, with only three or four seg- 

 ments in each ramus : second cirrus, with the basal 

 segments not very thickly clothed with spines : sixth 

 cirrus with seven segments, not protuberant in front, 

 each bearing four pairs of spines, without intermediate 

 tufts. 



Caudal dppendages, none. This is an interesting fact, 

 considering that these organs are likewise absent in the 

 hermaphrodite iS. villosum, — an absence highly remarkable, 

 and confined to the genus Conchoderma and the one 

 species of Anelasma. 



Penis thick, not tapering, rather exceeding in length 

 the pedicel of the sixth cirrus, square at the end, and 

 furnished with some spines. In one specimen, I believe 

 I distinguished the vesiculae seminales : if so, they con- 

 tained only pulpy matter, and not spermatozoa. There 

 were no ovarian tubes within the peduncle, which was 

 lined by the usual muscles ; I traced the two delicate 

 cement- ducts, running from within the antennae close up 

 to the animal's body. Hence in this case, as in that 

 of S. Peronii, I dare positively affirm that ovarian tubes 

 do not occur; for it is out of the question that I could have 

 traced the cement-ducts, and, at the same time, overlooked 

 the far larger and more conspicuous ovarian tubes, into 

 which, moreover, the ducts, had they existed, would have 

 run. Consequently, these parasites are not females; 

 but judging from the probosciformed penis, and from 

 the presence, as I believe, of vesiculae seminales, they are 

 males. 



The complemental males of the present species, and of 

 S. Peronii, so closelv resemble each other, that what I 



