406 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



marked character of the pleon is its obliquely truncated extremity. 

 The oblique terminus is perfectly flat, with a raised marj^in. 



The feet of this species, as in the typical species described by Dana, 

 are in two series. The first is composed of the first three pairs of feet, 

 which are comparatively stout and increase in length to the third 

 segment. The second series begins on the fourth segment with a 

 pair of short feet, which fold transversely', the other pairs are suc- 

 cessively longer and fold backward. The feet of the second series 

 are much more slender than those of the first. The dactyl i of all are 

 bi-unguiculate. The carpal and propodal joints are spinulose beneath. 



The operculum is not traversed by an oblique line. The sides of the 

 basal segment-are subparallel. The terminal segment is about as broad 

 as long. 



Length, 15 mm.; width, 3 mm. 



Type.— C?ii. No., 22579, U.S.N.M. 



CLEANTIS OCCIDENTALIS Richardson. « 



Cleantis occldentalis Richardson, Proc. U. S. Nat. 

 Mus., XXI, 1899, pp. 850-851; Ann. Mag. Nat. 

 Hist. (7), IV^ 1899, pp. 270-272. 



Locality. — Magdalena Bay, Lower Cali- 

 fornia. 



Depth. — 1 2 fathoms . 



Body narrow, elongate; sitrface smooth. 



Head of same width as thoracic segments, 

 and with a small, median anterior depression. 

 Eyes lateral. First pair of 

 antenna? consisting of four 

 joints, reach the middle of 

 the third joint of the second 

 pair of antenna?. Second pair 

 of antennae consist of six 

 joints (five seen from a dorsal 

 view), the last joint being the 

 flagellum. Maxillipeds with 

 the palp composed of four 

 articles.^ 



The thoracic segments show 

 a gradual, though marked, 

 decrease in length, the first 

 one being the longest and 

 somewhat excavate on its anterior margin. The epimera of the second, 

 third, and fourth segments are short and narrow, reaching but half the 



« The type of this species unfortunately has been lost. 



i> The i)alp of the maxillipeds was heretofore wrongly represented as composed of 

 onlv two articles. 



~s 



r 



"n 



aJU 



Fig. 455.— Ci.eantis occidex- 



TALIS. X 10. 



Fig. 456. — Cleantis 

 occidentalis. 

 Maxilliped. X 39. 



