98 PROCEEDINGS OF THE CALIFORNIA 



gin of orbit a long thick, sinuate tubercle. Teeth of front, upper and under 

 margins of orbit, and a small tooth just external to the outer hiatus of the 

 orbit, red, smooth, shining, and naked. The remainder of the upper surface 

 of the carapax thickly tomentose. Antero-lateral margin with three sharp 

 teeth projecting beyond the tomentosity. Regions of carapax distinct. Cheli- 

 peds tomentose, the carpus and manus covered with tubercles arranged in reg- 

 ular series on the outer side of the manus. Right cheliped larger than left; 

 fingers sulcate. Tubercles of manus and carpus red, the red predominating 

 at the distal end of the manus. Longer hairs scattered at intervals among 

 the tomentosity of the carapax; hinder limbs thickly pilose. 



Localities, San Jose Island, Amortiguado Bay; and Port Escondido, both 

 in the Gulf of California. 



Several specimens. The largest pair measure as follows : 



M. M. M. M. 



Greatest length 19 15 



Greatest width 27 20 



No. 43. Male and female, in spirits. Fisher and Lockington. 



Xantho tenuidactyhs. nov. sp. 



Front declivous, antero-lateral margin without distinct lobes or teeth, thick; 

 anterior portion or carapax somewhat negose, granulate; carpus and manus 

 thickly covered with large granulations above and externally, the granulations 

 extending on to the upper and outer surface of the fingers; fingers sulcate, 

 those of the right cheliped (which is the larger) rather short; those of the 

 left cheliped exceedingly long and thin. Hinder legs somewhat tomentose. 



Color reddish-brown ; fingers black. 



One specimen only, a female, taken at low tide, on the flats at La Paz, 

 Lower California. 



M. M. 



Length of carapax 15 



Width of carapax H 



Xantho grandimanus. nov. sp. 



Carapax transverse, antero-lateral angles not prominent. Front four-lobed, 

 the central emargination running back as a deep sulcus across the frontal re- 

 gions of the carapax. Upper margin of orbit tumid, backed by a deep sul- 

 cus, giving off at a right angle, a sulcus separating the median from the lat- 

 eral regions of the carapax. Antero-lateral teeth, five; the first two long and 

 low; third low, but somewhat shorter; fourth much shorter and pointed; 

 fifth very small. Areolation indistinct; frontal and antero-lateral regions 

 granulated. Right cheliped very large, smooth, meros hollowed out through- 

 out its posterior upper surface so as to fit closely to the under surface of the 

 carapax; carpus large, heavy and rounded; manus broad, rounded above and 

 without crests or tubercles; movable finger with a very large tubercle at its 

 inner base; fixed finger with three or four tubercles. Left cheliped Bimilar, 

 but much smaller; fingers much smaller proportionately to the manus than 



