674 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 41. 



projects beyond the anal valves and bears about four setsB directed 

 downward. 



The distal segment of the antennular peduncle is not enlarged; 

 there is a rather scanty brush of hairs springing apparently from the 

 enlarged first segment of the outer flagellum. The antennal flagellum 

 is as long as the body. The first four pairs of legs carry v/ell-developed 



Fig. 110.— Colubosttlis (?) occidentalis, male, feom the side. 



exopods. Both pairs of pleopods are biramous, with the exopod in 



each case of two segments. The uropods resemble those of the female, 



but are provided with much more numerous spines. 



Remarks. — This species resembles Colurostylis pseudocuma^ in the 



small size of the telson and in the general characters of antennules, 



antennae, and male pleopods. It differs, however, in many important 



characters, and it is possi- 

 ble that some of these, 

 especially the peculiar 

 form of the thoracic pleu- 

 ral plates, the expanded 

 penultimate segment of 

 the female antenna, and 

 the remarkable structure 

 of the endopod of the uro- 

 pods deserve to be recog- 

 nized by making it the 

 type of a separate genus. 



In having the endopod of the uropods of three segments it is nearer 



the normal type of the Diastylidse than C. psevdocuma. The narrow 



notch on the anterior margin of the second free somite recalls that of 



Diastylopsis dawsoni. 



Localities.— Albatross station 3094; off Oregon, lat. 43° 01 '00" N.; 



long. 124° 30^30'' W.; 35 fathoms; bottom temperature, 46.7° F.; 



U.S.N.M. 44010; 1 female (holotype) . 



Pacific Grove, California; J. O. Snyder, July, 1895; U.S.N.M. 



44009 ; 4, male and female. 



Albatross station 4564; Monterey Bay, California; 9 fathoms; 



U.S.N.M. 44008; 1 female. 



Ill 112 



Figs. 111-112.— Colurostylis (?) occidentalis, male. HI, 

 Antennule; 112, last somite and telson. 



J Caiman, Trans. Zool. Soc, vol. 18, 1911, p. 377, pi. 36, figs. 23-36. 



