ACADEMY OF SCIENCES. 43 



Amphiirite Edwards'^. 



Inter-antenual front four-toothed, the teeth rounded, and the central emar" 

 gination by far the deepest. A deep sinus between the front and the pre-or- 

 bital tooth, which is two-lobed; thus there are altogether eight teeth between 

 the eyes. Antero-lateral margin nine-toothed, the teeth alternately large and 

 email; commencing with a post-orbital. Meros of left cheliped (the right is 

 wanting in our specimen) with four teeth on the inner margin, the tooth next 

 carpus much smaller than the others. Carpus with a long spine on the 

 inside, and four spines on the outside. Manus with three spines above, 

 and three rows of small tubercles on the outside. Fingers sulcate, tubercu- 

 late on inner border. Two transverse ridges across the carapax, one in the 

 center of the length, divided into three portions by the sulci separating the 

 central region from the antero-lateral ones; the other shorter, crossing the 

 central region in its widest portion. These ridges are beaded. 



Length, 0.87. Width, 1.25. 



The specimen is a male, and was brought from Mazatlan by Mr. Hy. Ed- 

 wards. This, and Lupa belli cosa Sloat, are the only Portunidas yet known on 

 the Pacific Coast north of Central America. 



Betceus equimanus. n. s. 



Base of inner antennas three-fourths the length of base of outer antennae, 

 flagella about half as long as those of the external antennas. Outer append- 

 age of inner antennas about two-thirds as long as the inner. External antennas 

 considerably more than half as long as in the body. Outer inaxillipeds as 

 long as base of inner antennas. Hands of first pair of legs about equal in 

 size, oblong ovate; dactylos with a sharp recurved point, and a straight cut- 

 ting edge margined with setas; the cutting edge is opposed to a similar straight 

 cutting edge, also margined with setas, on the palmar surface, which also ends 

 in a sharp incurved point. The fingers gape somewhat at* the proximal end, 

 where they are tuberculate. Second pair of feet slenderer than the third and 

 fourth; but not much longer. » 



Front curvately emarginate between the eyes, which are clearly visible 

 through the projecting part of the carapace. Carapace recurved. Body con- 

 siderably depressed. Epimera ( Coxa-) of second abdominal segment large, 

 overlapping those of the adjoining segments. 



Length of larger specimen, 1.05. 



Two specimens, both females with ova, which in one case are large and 

 evidently mature. 



This species lives under the mantle of Haliotis rufescens, and the specimens 

 were procured at Catalina Island by S  A. L. Brannan. Color in alcohol, a 

 light flesh color, the liquor itself taking the same tint; when fresh, a dark 

 purp'e. 



Alpheus clamator. 



Front tri-spinose, the largest point forming the rostrum, and slenderer 

 than the others, from which it is separated by a deep sulcus ; the lateral spines 

 quickly widening out into a shield curved closely over the eye. Carapace 



