224 RICHARDSON 



in the shorter second pair of antennae ; in the structure of the first pair 

 of antennae, which have the flagellum composed of only a restricted 

 number of articulations ; in the structure of the first pair of legs in the 

 male, these being " remarkably developed, prehensile, much longer than 

 any of the other pairs, with the carpal joint fusiformly dilated " ; in the 

 female, however, this pair does not differ from the other legs, all being 

 ambulatory in character. 



JANIRA OCCIDENTALIS Walker. 



Janira occidentalis WALKER, Trans. Liverpool Biol. Soc., xn, pp. 280, 281, 

 pi. xv, figs. 7-10, 1898. RICHARDSON, Proc. U. S. Nat. Mus., xxi, 

 p. 859, 1899. 



Locality. Puget Sound (Harriman Alaska Expedition). 



Family ASELLID^E. 



ASELLUS TOMALENSIS Harford. 



Asellus tomalensis HARFORD, Proc. Calif. Acad. Sci., vii, pp. 54, 55, 1877. 



Locality. Tomales Bay, California (Harford). 



The description of this form is given in the following concise manner : 

 " Head a little transverse, narrower than the body. Upper antenna not 

 reaching to the extremity of the peduncle of the lower. Flagellum of 

 lower antennae longer than its peduncle. Body narrow in front, grad- 

 ually increasing in width towards the tail. Peduncle of caudal append- 

 ages more than half the length of the terminal filaments. Length 2 ^o 

 inch." 



The description is from a single specimen. 



Eight specimens of a species of Asellus were collected by the Harriman 

 Alaska Expedition at Lake Washington, Seattle. I have referred them 

 to the above species, being unwilling to describe a new species of Asellus 

 from a locality so close to that from which A. tomalensis was found, when 

 so little is known about A. tomalensis. Some of the specimens were sent 

 to Dr. William E. Ritter for comparison with the type and only specimen 

 of A. tomalensis in the collection of the California Academy of Sciences. 

 The result of his comparison is given in the following quotation from his 

 letter : " About the only difference that I am able to make out is in the 

 fact that the inner ramus of the sixth pleopods (uropods ?) of A. tomalen- 

 sis is about half as long as the exopodite, and that neither is armed with 

 a tuft of hairs at the tip. This is the case with the one appendage 

 present, but its mate is gone. It is possible that the hair-tuft may have 

 been broken off, but the tips of the rami themselves are perfectly smooth. 

 They show no evidence of having lost anything. The fact, however, 



