68 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



and broadly rounded at the end, the median sinus is very narrow; 

 the superior inner and outer teeth of the orbit are subacute; the 

 antero-lateral teeth are relatively longer and more outstanding; the 

 lateral spine is more than twice as long as the adjacent tooth; the 

 inner spine of the carpus is rather longer than the neighboring spine 

 of the manus; the spine on the merus of the last leg is sharp and 

 distinct. This form gradually changes to that of the adult and full 

 grown. 



(7oZor.— Pubescence light yellowish, ridges russet. Lateral teeth 

 reddish at base, white at tips. Fingers whitish, extremity red. 

 (Desmarest.) 



Young specimen white with a very faint tinge of vinaceous buff; 

 another had a longitudinal median area of slate-color on the carapace. 

 (Schmitt.) 



Measurements. — Male (61277) total length of carapace 51.7, width 

 of same 85.6, width at anterior base of lateral spine 77.7, fronto- 

 orbital width 37.8, width of front 12 mm. Male (S. U. I.) from 

 Bahama Banks, total length 58, width 95, length of cheliped 200 mm. 

 A. Milne Edwards records a male with carapace 60 by 100 mm. 



Range. — New Jersey to State of Santa Catharina, Brazil. Ber- 

 muda (rare). 



Material examined. — See table, pages 64-67. 



PORTUNUS (ACHELOUS) BREVIMANUS (Faxon) 



Plates 29 and 30 



Achelous s-pinimanus Faxon, Mem. Mus. Comp. ZooL, vol. 18, 1895, p. 23; not 

 Portunus spinimanus Latreille. 



Achelous brevimanus Faxon, Mem. Mus. Comp. ZooL, vol. 18, 1895, p. 23 (type- 

 locality, near Cocos Island, 66 fathoms, station 3368, Albatross; 1 male 

 cotype, Cat. No. 20608, U.S.N.M., and 1 male cotype in M. C. Z.). 



Portunus (Achelous) brevimanus Rathbun, Proc. U. S. Nat. Mus., vol. 21, 1898, 

 p. 593; vol. 38, 1910, p. 578 (part; not the Galapagos specimens). 



Diagnosis. — Branchial ridge subparallel to lateral margin as far as 

 the line of the anterior margin of the sixth lateral tooth where it turns 

 inward. Inner spine of wrist reaching about half way to the proximal 

 spine of the upper manus. Two spines at postero-distal angle of 

 merus of swimming leg. 



Description. — The Pacific analogue of P. spinimanus, from which it 

 differs in being less pubescent, surface more uneven, the long branchial 

 ridge more strongly arched forward, the two short branchial ridges 

 more obhque, median lobe of superior orbital margin more advanced 

 at outer angle, inner spine of wrist longer; merus of swimming legs 

 also longer and armed with two spines at the postero-distal angle. 



Measurements. — Male cotype (20608), total length of carapace 44.5, 

 width of same 74, width at anterior base of lateral spine 63.8, fron to- 

 orbital width 30.4, width of front 9.7 mm. 



