CALIFORNIA STALK-EYED CRUSTACEA. 153 



lower surface of baud tumid below base of pollex aud armed witb short 

 spiues; au angle of 90" between its upper and inner faces. Ambulatory 

 legs hairy; carpus of the anterior pair spiny above; propodus armed below 

 with short sj^inules and above with seven or^ eight rather strong spines; 

 dactyls flattened, much longer than the propodi, both margins closely set 

 with spines; second pair much less spiny than the first. 



There is a pair of very small, simple, two-jointed appendages on the 

 first abdominal segment in the female, but the succeeding four segments 

 have an appendage only on the left side; of these the first three (those on 

 the second, third, and fourth segments) are well-developed and biramous, 

 but the appendage on the fifth segment is smaller and reduced to a single 

 branch. In the male the pair of appendages on the first abdominal seg- 

 ment is larger than in the female and the inner faces are channeled; the 

 second segment has a pair of appendages, and the third, fourth and fifth 

 segments have a uniramous appendage only on the left side. . 



General color dark reddish; legs more or less colored with blue. 



Length of female 2.5 in,; of males 4.5 in. and 5 in. 



Described from three specimens from San Diego, 

 Calif.: one a female loaned by the San Diego Natural 

 History Society, and two large males. For the oppor- 

 tunity of examining the latter I am indebted to Dr. 

 Fred Baker of San Diego. 



This species is allied to P. fecundus Faxon, but is dis- 

 tinguished by having a less prominent rostrum, much 

 longer antennal flagellum, shorter dactyls on the sec- 

 ond and third pereopods, and small but well-marked 

 spines instead of ''obscure teeth," on the terminal lobes 

 of the telson. 



Holopagurus, gen. nov. 



Rostrum not prominent. Ocular peduncles moderately long and slender; 

 basal scales close together. Antennal acicle rather short; flagellum hairy. 

 Left cheliped larger than the right; fingers of both hands moving horizon- 

 tally, their inner margins not excavated. Fourth i^air of legs more or less 

 chelate. First abdominal segment of the male devoid of appendages; sec- 

 ond, third and fourth segments with an appendage only on the left side. 

 Telson entire. 



Type — H. pilosus. 



