b PROCEEDINGS OF THE CALIFORNIA 



16. Grapsus plctas. De Saussure; Keviie et Mag. de ZooL, V., 362; Stimp- 

 son, Crust. & Echi., P. S. N. A., 26. 



Stimpson doubts the identity of De Saussure's 't. i/ldus with that of La- 

 treille. I have as yet, among abundant specimens of Crustacea from the east 

 and west coast of Lower Cahfornia, received but one species of Grap.sus, and 

 this does not agree, either in coloration or in the meriis of the jjosterior legs, 

 with the tj. p'lrins described by Dana, Crust. U. S. Ex, Exp , 1, 'SM . 



16. Fsetido(jrapsus,l OnyoutiDii.s. Dana, U. S. Ex. Exp., Crust., 1. 334, pi. 

 /fdercxjrnps^iH, ) XX, f. 6: Milne Edwards, Melanges Carcinologiques, 



157 : Stimpson, Proc. Cal. 8ci., 1, 3S. 

 No. S-l. Three males, dried, S. F. Bay. Lockington. 

 No. 55. Several specimens, S. F. Bay. J hid. 



17. I'smdoiirdpsus, ) Nudns. Dana, U. S. Ex. Exp., Crust., 1, 33o, pi. XX, 

 /Jcli-roiji'opsxs, \ fig. 7 ; Milne Edwards, Inc. rit., p. 15!) ; Stimpson- 



Inc. clt., 1, 3S. 

 No. 56. Several specimens, S. F. Bay. Lockington. 

 No. 57. Several specimens. Black Point, S. F. Bay. Lnckiugton. 



IS. G()iii(>(iraj)siis ■pulc/irr. nov. sj). 



Carapax with numerous transverse lines, not extending to the central re- 

 gions. Sulcus between gastric and cardiac regions, very distinct One an- 

 tero-lateral tooth behind the post-orbital. Sides convergent posteriorly. 

 Perpendicular portion of front about four times as long as high. Outer an- 

 teunfe exsert. Outer maxillipeds widely separated, narrow. C!heltpeds sub- 

 equal, merns triqnetal, with the upper margin rounded, lower anterior ditto, 

 produced into a wing-like keel, armed with about nine teeth on its edge: pos- 

 terior margin toothed. Two or three teeth on the anterior edge of the 

 ischium. Carpus with three teeth on its upper anterior angle. Manus broad 

 and thin, smooth exteriorly, tubercular interiorly. Dactylus tubercular 

 above. Upper surfaces of the merus crossed by transverse raised lines simi- 

 lar to those of the carapax. Carpus crossed, also, by rug;e, which show a 

 tendency to split up into tubercles. Tubercles of manus arranged in longitu- 

 dinal rows along its upper margin. .Vmbulatory legs, with the distal end of 

 merus three-toothed, the upper tooth sharp, the two others long and rounded 

 lobes; terminal joints with scattered hairs; dactyli spinose. Abdomen of 

 the male with the two first joints very short, the third joint widest, and with 

 strongly convex sides; remaining joints regularly diminishing in width, with 

 a slight convexity. Color citrine, with a variable reticulation of dark brown, 

 the ground becoming yellowish upon the legs. Chelipeds bright red. 



Several specimens of both sexes from Magdalena I>ay, west coast. Lower 

 California. 



The measurements of two average-sized specimens are as follows: 



d P 



Greatest length of carapax 40 30 



Greatest width of ditto 43 34 



