CALIFORNIA STALK-EYED CRUSTACEA. 223 



The distal portion of the thoracic legs is divided into 8-10 setiferous 

 articulations, the last joint furnished with a claw. In the fourth pair of 

 pleopods in the male the endopod reaches about to the middle of the 

 slender, elongated exopod; terminal joint of the exopod short and bearing 

 two large, sparingly plumose setae at the tip. Telson triangular, tip 

 slightly emarginate, margins armed with several spines. Inner ramus 

 of the uropods widened at the base and tapering to an acute tip which 

 reaches beyond the telson; outer ramus much longer than the inner one, 

 the sides subparallel to the rounded tip. 



Almost colorless, with the exception of several large, irregularly branch- 

 ing pigment spots. 



Lake Merced, Calif. Collected by Dr. H. P. Johnson. 



Neomysis franciscorum, sp. nov. 



Anterior margin of the carapace produced forwards into a wide quadrate 

 lobe with a straight anterior margin and rounded angles. A strong spine 

 at the antero-lateral angles of the carapace, above which the margin is 

 concave. Eye-peduncles large and pyriform. Autennular peduncle 

 reaching about one-third the length of the acicle. First joint of the 

 antennas with a spine at the antero-exterual angle; peduncle one-fourth 

 the length of the acicle, which is very narrowly lanceolate and ciliated on 

 both margins. Epistome produced anteriorly into a spine. Last joint of 

 the mandibular palp narrow and somewhat shorter than the preceding one 

 which is much widened. Thoracic legs similar, the propodi divided into 

 from ten articulations in the first, to fourteen in the last pair. All the 

 pleopods in the female short and simple. Telson narrow, concave above, 

 and tapering evenly to a point, the margins armed with numerous spines. 

 Inner uropods narrow, tapering to an acute tip, and about equalling the 

 telson. 



Length, 1.25 in.; length of carapace, T 5 g in.; of telson, T 5 ^ in. 



A single specimen taken in San Francisco Bay. 



This species is closely allied to Neomysis Rayii (Mur- 

 doch) from Point Barrow, but differs in having the 

 telson acute instead of " truncated," and in having the 

 terminal portions of the thoracic legs divided into a 

 greater number of articulations. Collection University 

 of California. 



