VOL. XVI, 1 



ifon. J 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



243 



and parallel. Suborbital border with an outer liiatus and a broad, 

 rounded inner lobe. First se^jnumt ol" the male abdomen very short 

 and wide; second, longer and much narrower; third, as wide as the 

 first at its proximal eud ; fromthis point to the distal end of the ])euulti- 

 mate segment the marjuin of the abdomen is maikedly concave; the 

 three divisions of the coalesced segment laintly indicated; terminal 

 segment rounded, about as long as broad ; abdominal appendages long, 

 slender, and curved, JMcrus of external maxillipcds ])rodnced at the 

 anterolateral angle in an acute angle, ('li(^lii)cds slightly une«|ual; 

 merus obscurely granulate, margins tuberculate, a small spine near the 

 distal end of the upi>er margin; carpus graindate with a sj>iniforni 

 tooth at the inner angle; hand grannlatc, with longitndinal rows of 

 tubercles on the palm and ou tlu^ margins; fingers broad, not gaping, 

 deflexed, coarsely toothed within. Ambulatory legs smooth, shining, 

 sparingly punctate; dactyls margined with hair; remaining joints 

 spaisely hairy, ^riie margins of the carapace and the upper margin of 

 the hand are sparsely hairy, while the inferior ])ortions of the carai)ace, 

 the upper margin of the merns, the inner margin of the carpus, and the 

 abdomen of the female, are thickly fringed with hair. 



Length, 17; width, 21 millinu'ters. 



Gulf of California; U. S. Fish Commission stcnmer Albatross, 1889: 



This species can at onc(^ be distinguished from ('((rolincmishy the less 

 prominent an tero lateral teeth, by the shape of the front, and by the 

 granules oT the hand. 



Carcinoplax dentatus. 



Carapace broader than long, very con.vex longitudinally, less so trans 

 versely, regions slightly marked ; surface microscopically granulate and 

 pnbcs(;ent. An indistinct ari^iiate lidgc extends transversely across the 

 gastric region and joins two others rnnning longitudinally across the 

 branchial regions; from these ridges the carapace slopes downward to 

 the frontal and lateral margins. Front about one-third the width of 

 the <'aiapa<e, ncaily straight, thick,two edged, and deeply grooved, wilii 

 a faint median notch. Siii)ra orbital border denticulate, with two fis- 

 sures, the outer one broad. Anterolateral teeth three, broad, separated 

 by wide sinuses, margins denticulate; lirst tooth at tlie orbital angle, 

 with nearly straight sides; second with outer margin (;onvex, inner 

 concave; third tcoth similar to the second, but narrower. Postero- 

 lateral inaigins nearly straight. Male abdomen with se\('ii segments, 

 not entirely covering the sternum at its base; lirst jiMiit no wider than 

 the second, neither reaching the cox.'c; third joint very wide, touch- 



