POLLICIPES MITELLA. 823 



some are coarsely pectinated j the basal segments of the 

 posterior ramus are rather more thickly clothed with 

 bristles than are the posterior cirri, but otherwise resemble 

 them. The third cirrus, as already stated, is exactly like 

 the three posterior pairs ; and this is a very unusual cir- 

 cumstance. On the dorsal surfaces and sides of the 

 pedicels of the posterior cirri, there are some scattered, 

 short, thick, minute spines. 



Caudal djjpendages, multi-articulate : in a medium- 

 sized specimen, each contained eight segments, which 

 reached half-way up the upper segment of the pedicel of 

 the sixth cirrus. Lower segments flattened; the upper, 

 tapering, and cylindrical; all have their upper margins 

 furnished with stiff, little spines. In a young specimen 

 (only '3 of an inch in length, including the peduncle), 

 the caudal appendage contained only four segments, and 

 the tip did not reach to the upper edge of the lower 

 segment of the pedicel of the sixth cirrus. 



Stomach, without caeca. 



Generative System. — Vesiculae seminales not reflexed 

 at their broad ends ; white, spotted with black. Testes, 

 pear-shaped, borne on long footstalks : penis covered with 

 minute bristles, in little tufts arranged in straight lines. 

 The ovarian tubes fill up the peduncle to its base, but do 

 not surround the sack ; they are of small diameter, and 

 simply branched. There is a very narrow ovigerous frae- 

 num, with a straight edge, lying on each side under the 

 line of junction between the scutum and upper latus. 



Affinities. — This species differs from all the others of 

 the genus, in the third cirrus resembling exactly the three 

 posterior pairs. In most of its characters — namely, in the 

 symmetrical arrangement of the scales on the peduncle, 

 in the considerable size of the valves of the lower whorl, 

 in the general approximation of the valves, in the multi- 

 articulated caudal appendages, in the form of the outer 

 maxillae, in the prominent olfactory orifices, in the basal 

 segments of the anterior ramus alone of the second cirrus 

 being paved with bristles, there is more affinity to P. cor- 



