ko.1654. IMPHIPODA FROM WEST WORTH IMERICA HOLMES. 513 



Rami of lir^t uropods Longer than peduncle, subequal and reaching 

 to middle of rami of third pair, outer ramus devoid of spines, inner 

 with twenty to twenty-live on upper margin. Second uropods with 

 rami equal, a little Longer than peduncle, armed with several short 

 spines on one edge, outer ramus with a very Long spine near tip. 

 Third uropods with broad, flat rami broadly rounded at tip except for 

 a small cusp, and furnished distally with long plumose seta'. Telson 

 elongate and armed with about four shorl -pine- on cither Lobe. 



Li ngth. — -12 mm. 



Locality. — Station 1549, Monterey Bay, 56-57 fathom-, two female-; 

 Station 4.V>('>, Monterey Bay, 56-59 fathoms, one female, type. 



Type.— Cat. No. 38543, CJ.S.N.M. 



This species is readily distinguished from the others here described, 

 as well as most others of the genus, by the wide rami of the terminal 

 uropods with their broadly rounded extremities. The penultimate 

 joint of the palp of the maxillipeds is peculiar in being produced be- 

 yond tin- articulation of the dactyl, so that the latter appears to arise 

 from near the middle of the inner margin. 



AMPELISCA CALIFORNICA. new species. 



Female. — Head about as Long as first three segments of thorax: 

 lower pair of eyes on anterior margin of head. Fir-t antennae but 

 slightly exceeding peduncle of second, the second joint three times 

 length of first; flagellum over twice length of peduncle. Second an- 

 tenna' nearly as long as body: last joint of elongate peduncle a little 

 shorter than preceding one: flagellum nearly twice the peduncle. 

 First gnathopods with hand shorter than carpus: palm at angle of 

 about 45° with posterior margin of hand. Second «rnathopods con- 

 siderably Longer and more slender than the first: hand about half the 

 length of the narrow carpus. First two perseopods with the dactyl 

 over a half Longer than the two preceding joints combined. Third 

 and fourth perseopods with plumose -eta' around the prominent 

 rounded anterior projections of the basal joint-; anterior margin of 

 propodus of fourth perseopod armed with long spines which are ab- 

 sent on corresponding joint of third pair. Last pair of perseopods 

 with basal joint produced slightly beyond end of the ischium; which 

 is nearly as long as broad: meru- produced obliquely downward pos- 

 teriorly into a large oblong lobe fringed with plumose -eta': carpus 

 produced downward in front into an acute triangular lobe whose 

 lower margin is furnished with a few -eta' and three -tout -pine-, each 

 bearing a small cilium; anterior margin with a small prominence 

 near the lower end bearing a short spine; dactyl shorter than propo- 

 dus and attenuate and flexible at tip. 



Infero-posterior angle of third abdominal segment produced into 

 a tooth. Fourth abdominal segment with a dorsal crest, which bears 

 Proc. X. M. vol. xxxv — OS 33 



