252 University of California Publications in Zoology 1[Vow. 23 
Pinnotheres nudus Holmes 
Pinnotheres nudus Holmes, Proc. Calif. Acad. Sci., (2), 4, 563, figs. 1-5, 
1894 (1895); Oceas. Papers Calif. Acad. Sci., 7, 86, 1900; not P. nudus 
Weymouth, Stanford Univ. Publ., Univ. Ser., no. 4, 53, fig. 1, except 
synonymy; Rathbun, Bull. U. 8. Nat. Mus., 97, 83, fig. 40, 1918. 
ON 
Fig. 149. Pinnotheres nudus, 9, slightly enlarged; a, outline of carapace; b, 
outline of abdomen; c, outer maxilliped; d, left cheliped; e, first ambulatory leg 
(after Holmes, from Rathbun). 
é 
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). 
Remarks.—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 Rathbun, Proc. U. S. Nat. Mus., 16, 250, 1893; 
Holmes, Occas. Papers Calif. Acad. Sci., 7, 96, 1900; Rathbun, H. A. 
E., 10, 188, pl. 7, fig. 6, 1904; Weymouth, Stanford Univ. Publ., Univ. 
Ser., no. 4, 60, 1910; Rathbun, Bull. U. S. Nat. Mus., 97, 86, text fig. 
42, pl. 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 
