Oil a H' 10 Crab of the Geims Calappa. 41)."} 



LXVH. — A new Crab of tlie Genus' Calappa from West 

 Africa. By \V. T. Cal.max, D.Sc. 



(PiiljlisIieJ bv permission of tho Trustees of the British Museum.) 



A SMALL hut very interesting collection of Crustacea obtained 

 by trawling off Lagos, West Africa, has recently been pre- 

 sented to the iiritish iVIuseum (Natural History) by Mr. J. 

 Cadnian, of the Western Fisheries, Ltd. Among them are 

 five specimens of a crab that appears to differ fronx auy 

 species hitherto described. 



Calappa piscaturum, sp. n. 



Carapace about four-fifths as long as wide, very convex ; 

 the longitudinal grooves well marked, surface smooth, exce[)t 

 fora few low and ill-defined tubercles ant-'riorly and scat- 

 tered granules near the posterior margin. Lateral expan- 

 sions small, formed of acutely triangular teeth, which are 

 not distinctly keeled on the upper surface ; laterally there 

 are three teeth, which are continued without any well- 

 marked limit by the more obtuse teeth of the antero-lateral 

 margin, becoming obsolete anttri>rly ; [)Osteriorly are three 

 more acute and well-separated teeth on each side, the 'ast 

 pair directed backwards, bounding the true hind uiargin, 

 which is beaded and convex or obscurely angled in thij 

 middle. 



Front projecting well beyond the orbits, with a deep exca- 

 vation, the distance between the points about equal to two- 

 thirds the width of the orbit. 



Endostomial sei)tuiu convex anteriorly. 



Crest of the merus four-lobed, each lobe with a sharp 

 point, the anterior lobe acute and turned forwards. Outer 

 surface of palm with blunt tubercles and scattered granules 

 between them ; crest of palm with five palisade-like teeth 

 and three l)lunt tubi-rcles ; tooth at proximal end of lower 

 border sharp, but not spiniform. 



Diinensioiis of carapace in milli/neires : — 



Locality. '' Off Lagos, West Africa. Mud bottom." 

 Remarks. In general aspect this species approaches the 

 Mediterranean and West-African C. granulata (Linn.), but 

 differs from it and from all the other species of which speci- 

 mens are available for comparison in the very large and 

 baekwardly directed teeth on the hinder margin of the 

 Ann. (i- Mag. X. Hist. 8er. 8. \'oL xiv. 34 



