1 'I PROCEEDINGS OF THE CALIFORNIA 



4b, 5th, 6tli, 7thaud 8th antero-lateral teeth equal, all broadly triangular. 

 Ninth tooth much the largest, its upper ridged edge continuing across the 

 earapax for some distance. Lower margin of the orbit pilose, rising into a 

 conspicuous tooth immediately below the outer antenna. Underside of cara- 

 pax and sternum without hairs, except below the hinder part of the antero- 

 lateral regions. Meros of first pair trigonal, with four sharp spines on its 

 upper anterior edge and two blunt teeth at the distal extremity of its poste- 

 rior edge. Carpus wath two or three ridges exteriorly, and some short, blunt 

 spines anteriorly. Mauus with a triangular tooth next the carpus on its 

 uijper anterior edge, and also a blunt tooth at the distal extremity of its upper 

 posterior margin. Dactyli only slightly sulcate; the teeth of the inner mar- 

 gins in groups of three; the central one largest. Second, third, and fourth 

 pairs of limbs stout; the two last joints compressed and sulcate, pilose pos- 

 teriorly. Fifth pair stout, without sulcations on the last two compressed 

 joints. 



Several fine specimens of this species were brought from Magdalena Bay, 

 by Mr. W. J . Fisher. 



The dimensions of a large individual, of each sex, are as follows: 



& ■ P 



• M. M. M. M. 



Length of carapax ...... 6. 5.3 



Greatest width of carapax 11.5 io.2 



Length of right manus 7. 5_ 



The color is almost brown above, cream-colored below, the tubercles and 

 ridges of the manus tinged with red. 



No. 22. Male, in spirits; fine specimen, Fisher and Lockington. ' 



Liipa cUcantha. M. Edwards. Hist. Nat. des. Crust., tom. 1, p. 451. Dana. 

 U. S. Ex. Exp., 1, 272, pi. XVI, fig. 7, T. Hale Streets. Proc. 



Ampkitrite Edwardsii. Lockington. Proc. Cal. Acad., March 20, 1876. 



On looking over a number of Amphitrites from Lower California, I found 

 one only, a large female, that can be referred to this species. 



It presents all the characters of the type in the Academy's museum, but in 

 a more marked degree from its larger size. The nine spines of the antero- 

 lateral margin are alternately large and small, the ninth no larger than the 

 first, third, fifth, and seventh; and the points of all are black. The meros 

 of the first pair of legs has five black-tipped spines, that nearest the carpus 

 smaller than the central three and equal to the proximal one. The inter- 

 orbital teeth are eight in number, and the ridges across the carapax well de- 

 fined. The spines of carpus and mauus agree exactly with those of the 

 smaller specimen, previously described, and all are tipped with black. 



The general color of the carapax and limbs, in spirits, is red, with lighter 

 marblings. The tips of the fingers are black. 



M. M. 



Extreme width of carapax 51 



Extreme length 32 



Length of movable finger 13 



