VOL. XI, PP. 111-1 12 MAY 13, 1897 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTION OF A NEW SPECIES OF CANCER FROM 

 LOWER CALIFORNIA, AND ADDITIONAL NOTE ON 

 SESARMA* 



BY MARY J. RATHBUN. 



In a collection of Crustacea from Lower California recently 

 sent to the U. S. National Museum by Mr. A. W. Anthony, of 

 San Diego, California, are two specimens of Cancer which can 

 not be referred to any known species. 



Cancer anthonyi Rathbun, new species. 



Resembles C. antennarius Stimpson. Carapace wider than in antenna 

 rius, and more convex, especially in the posterior half. Elevated portions 

 of the gastric, branchial, and hepatic regions coarsely granulate. Front 

 narrower than in antennarius. Median supraorbital tooth less prominent 

 than in that species. Antennae shorter. 



An tero- lateral teeth nine, including the orbital ; broader and less pro 

 jecting than in antennarius; margins denticulate; second to eighth tooth, 

 inclusive, having the posterior margins about twice as long as the ante 

 rior ; first to sixth tooth, inclusive, obtuse ; last three teeth with short, 

 sharp tips, directed forward. Posterior margin with two faint emargina- 

 tions ; in antennarius this margin has a well marked tooth. 



Suborbital margin with three teeth besides the postorbital ; from the 

 median tooth a sharp ridge extends obliquely backward and outward. 

 Outer maxillipeds longer and narrower than in antennarius ; merus oblong, 

 anterior margins slightly oblique. 



The dark color on the fingers extends the entire length of the prehen 

 sile margins and less than half the length of the outer margins ; in anten- 

 narius, more than half the length of the outer margins. 



* Published with the permission of the Secretary of the Smithsonian 

 Institution. 



26-BioL. Soc. WASH., VOL. XI, 1897 (HI) 



