ACADEMY OF SCIENCES. 101 



on the palmar surface, those of left hand with a cutting outer edge. Hinder 

 pairs of limbs slender, slightly pilose. Color reddish brown (in spirits), chel- 

 ipeds bright red. 



Localities — Magdalena Bay, west coast Lower California; Mulege Bay, Port 

 Escoudido, San Jose Island, Gulf of California. 



M. M. 



Width of carapax 14 



Greatest length 10 



These dimensions are from one of the largest specimens. 



The extreme narrowness of the cara: ax and shortness of the antero-lateral 

 margin make me doubtful of the propriety of placing this species in the sub- 

 genus Xanlhodes. Its aspect is much that of a Pilodius, but the fingers are not 

 spoon-shaped. There are a few scattered seta? on the two last joints of the 

 ambulatory feet. There is considerable resemblance between this species and 

 X. latimanus from San Diego, but the hands of the former are wider and the 

 antero-lateral teeth more robust. The difference in size between the present 

 form and the siugle male of X. latimanus in the Mus. Cal. Acad. Sci. is great, 

 but it is not unlikely that it is either the young or a small variety of that spe- 

 cies, but as the gulf species are in most cases distinct from those of the west 

 coast of Lower California, I do not venture to unite them. 



Xantho latimmnus . Lockington, Pioc. Cal. Acad. Sci., Feb. 7, 1876. 

 No. 34. Male, dried. San Diego. Hy. Hemphill. 



Panopceus purpureas, nov. sp. 



Carapax convex both longitudinally and transversely, branchial regions 

 tumid, sulcus between gastric and cardiac regions distinct. Surface finely 

 granulated, the granulations with a tendency to form beaded ridges. Intra- 

 medial and extra-medial regions distinct from each other and from the antero- 

 lateral. First two teeth of antero-lateral margin coalesced, forming a promi- 

 nent bi-lobed tooth; third and fourth teeth curved forwards, the fourth short- 

 est; fifth thick and rounded, directed forwards. Sub-hepatic spine promi- 

 nent. Inferior margin of orbit three-lobed; interior lobe inconspicuous; mid- 

 dle lobe narrow, thick, projecting; outer lobe long, low, thin, highest on its 

 outer angle. Outer hiatus of orbit deep and narrow. Superior margin of 

 orbit with slight indications of a division into three lobes. Chelipeds smooth, 

 unarmed, the right the larger; propodi and dactyli of hinder limbs beset with 

 short bristly hairs. Colorof carapax and upper surface of chelipeds bluish 

 purple, becoming darker in the older specimens. Irregular spots and blotches 

 of a dark brownish purple are conspicuous in the younger specimens, but be- 

 come indistinct in the older, except upon the chelipeds. Fingers brown, with 

 white tips. 



<S i> 



Inches. Inches. 



Greatest length of largest specimens 1.30 .95 



Greatest width of largest specimens 1.75 1.30 



