252 University of California Publications in Zoology [Vol. 23 



Pinnotheres nudus Holmes 



Pinnotheres nudus Holmes, Proc. Calif. Acad. Sci., (2), 4, 563, figs. 1-5, 

 1894 (1895) ; Occas. Papers Calif. Acad. Sci., 7, 86, 1900; not P. nudus 

 Weymouth, Stanford Univ. Publ., Univ. Ser., no. 4, 53, fig. 1, except 

 synonymy; Bathbun, Bull. U. S. Nat. Mus., 97, 83, fig. 40, 1918. 



Fig. 149. Pinnotheres nudus, J, slightly enlarged; a, outline of carapace; b, 

 outline of abdomen; c, outer maxilliped; d, left cheliped; e, first ambulatory leg 

 (after Holmes, from Bathbun). 



Characters. — Carapace a little broader than long, smooth, and naked; front 

 rounded, deflexed, not protruding; orbits ovate. Antennules oblique. Palp of 

 outer maxillipeds nearly half as large as merus. Three anterior pairs of ambula- 

 tory legs subequal, fourth pair smaller; dactyls acute, nearly straight, those of 

 the fourth pair relatively longer and more slender than those of preceding legs. 

 Abdomen of female nearly circular in outline, covers entire sternal surface. 



Dimensions. — Types, two females: length of carapace 20 mm. and 15.5 mm., 

 width 24 mm. and 19 mm., respectively. 



Type Locality. — Santa Cruz, California. 



Distribution. — Monterey and Santa Cruz, California (Holmes). 



Bemarlcs. — This species has not been found since the records, noted above, were 

 made by Holmes. 



Pinnotheres concharum (Rathbun) 



Plate 38, figures 1, 2, 3, and 4 



Cryptophrys concharum Bathbun, Proc. U. S. Nat. Mus., 16, 250, 1893 ; 



Holmes, Occas. Papers Calif. Acad. Sci., 7, 96, 1900; Bathbun, H. A. 



E., 10, 188, pi. 7, fig. 6, 1904; Weymouth, Stanford Univ. Publ., Univ. 



Ser., no. 4, 60, 1910; Bathbun, Bull. U. S. Nat. Mus., 97, 86, text fig. 



42, pi. 20, figs. 3-6, 1918. 

 Characters. — Carapace subpentagonal, slightly longer than broad, smooth, 

 rigid, a faint sulcus behind the gastric region; anterior and anterolateral margins 

 defined by a ridge of coarse setae, which are thickest and longest at the antero- 

 lateral angles; orbits circular. Antennules large, nearly transverse. Palp of 

 outer maxillipeds nearly half as large as merus. Three anterior pairs of ambula- 

 tory legs subequal, the second the longest; the fourth pair the shortest, over- 

 reaching the carpal joint of the preceding pair; dactyli about as long as the 

 propodi, terminating in slender, curved hooks. Abdomen of male broadest near 

 proximal end of the second segment; first segment short; second, third, and fourth 

 segments coalesced, first two of these fused segments convex on the margin and 



