HERMAPHRODITE. 2G9 



cover the olfactory orifices. The latter are slightly pro- 

 minent, placed some way apart from each other, with 

 the above-mentioned tufts of bristles between them. All 

 the spines of the tropin are in some degree donbly 

 serrated. 



Cirri. — The first pair is seated rather far from the 

 second pair, and the prosoma being little developed, the 

 shape of the body nearly resembles that of S. vulgare. 

 The posterior cirri are elongated, very little curled, with 

 the segments much flattened, not at all protuberant, 

 bearing from five to seven pair of long serrated spines, 

 with a few small spines in an exterior row ; between each 

 pair there is a very minute tuft of small bristles ; the 

 upper lateral rim of each segment is toothed with small 

 spines ; spines of the dorsal tufts, long, serrated. First 

 pair, elongated, having numerous segments, namely, 

 seventeen, whilst the sixth pair in the same individual 

 had only twenty-one segments ; rami nearly equal ; seg- 

 ments short, nearly cylindrical, thickly clothed with long 

 serrated spines. The second and third pair are nearly 

 equal in length ; they have their anterior rami slightly 

 thicker than their posterior rami, both being much more 

 thickly clothed with spines, than are the three posterior 

 pair of cirri. Pedicels, rather short, with their inner 

 edges not forming a projection, as in S. vulgare. 



Caudal Appendages (PL X, fig. 20), uni- articulate, flat, 

 rounded at their ends and moderately long ; clothed most 

 thickly, like brushes, with very fine bristles, which latter 

 are serrated, and are longer than the appendages them- 

 selves. 



Penis, of small size, narrow, pointed, and thickly 

 clothed with delicate hairs ; in length equalling only one 

 fourth of the sixth cirrus. 



Ovigerous Frana, small> semicircular ; entire edge 

 thickly covered with glands. Ovarian tubes, within the 

 peduncle, fully developed as usual. 



Affinities. — This species differs from all the others in 

 the absence of calcareous scales on the peduncle ; but it 



