244 BULLETIN 2 01, UNITED STATES NATIONAL MUSEUM 



with four or five spines, the distal one about half as long as the outer 

 pair of apical spines, the remaining spines short. 



Outer uropod almost iy 2 as long as the telson; inner uropod equal 

 in length to the telson plus the terminal spines, thus only slightly 

 shorter than the outer uropod. 



Length of adult male 8 mm. 



Distribution. — Known only from the type locality off British Colum- 

 bia* in 65 fathoms. 



Remarks. — This species is distinguished by the combination of 

 characters afforded by the eyes, the antennal scale, and the telson. In 

 having the terminal portion of the antennal scale barely extending be- 

 yond the terminal spine of the outer margin, P. berkeleyi differs from 

 all the northern species of Pseudomma, P. roseum, P. affine, P. trunca- 

 tum, and P. frigidum. In this character it agrees with P. nanum from 

 the west coast of Ireland and P. kruppi from the Mediterranean. It 

 differs from P. nanum in the much coarser teeth on the ocular plates 

 and in having spines on the lateral margins of the telson. P. kruppi 

 has smooth ocular plates and only a single pair of spines on the apex 

 of the telson. P. berkeleyi is remarkable for the coarse character 

 of the teeth on the ocular plates, and by the long and very stout spines 

 arming the apex of the telson. 



PSEUDOMMA sp. ? 



Pseudomma sp. Esterly, 1914, p. 15. 



Distribution. — Known only from San Diego, Calif.*. 



Remarks. — Esterly (1914) recorded a female specimen of Pseu- 

 domma from California that is very closely allied to P. berkeleyi. 

 The antennal scale is identical in both species, and the armature of 

 the telson is closely similar. The ocular plate, to judge by Esterly's 

 meager description and not too clear figure of the California speci- 

 men, appears to be more microscopically and more finely serrate than 

 in the British Columbia species. 



CAESAROMYSIDES LIGURIAE Colosi 



Caesaromy sides Hguriae Colosi, 1916, p. 13S, fig. 1 ; 1919, p. 9 ; 1920, p. 242, pi. 18, 

 figs. 5a-c. 



Distribution. — The references in the synonymy, which all refer to 

 the same material, record this species from the western coasts of South 

 America, off Valparaiso*. This is the only known locality. 



MYSIDOPSIS ACUTA Hansen 

 Mysidopsis acuta Hansen, 1913a, p. 16, pi. 2, figs, la-lm ; 1921, p. 3. 



Distribution. — Falkland Islands*, 16 meters (Hansen, 1913) ; Tierra 

 del Fuego*, 6 to 10 fathoms (Hansen, 1921). 



