380 



A. E. Verrill — Decapod Crustacea of Bermuda. 



Achelous Sebae (H. M.-Edw.) Smith. 



Portunus sanguinolentus {pars) Lafcreille, Encyc. Method., pi. 272, fig. 6. 



{non Herbst sp. nee Stimpson) . 

 Lupa Sebce H. M.-Edw., Hist. Nat. Crust., i, p. 455, 1834. 

 ISFeptunus Sebce A. M.-Edw., Arch. Mus. Hist. Nat., x, p. 329, pi. xxviii, figs. 



2, 2a, 1861 ; Miss. Sci. Mex., v, p. 217, 1879. 

 Achelous Seba; S. I. Smith, Crust. Brazil, these Trans., ii, p. 34, 1869 (Brazil). 

 Portunus (Achelous) Seba; Eathbun, Brach. and Macr. Porto Eieo, p. 46, 1901. 



Figure 27. 



This fine species grows to large size. It is easily recognized by 

 an upright, acute spine on the basal joint of the posterior legs, and 

 a small spinule on the outer distal angle of the raerus joint of the 

 same legs ; and when recent by a pair of large round red spots on 

 the flanks of the carapace. But these spots are liable to fade in 

 alcohol, and in dry specimens exi^osed to light, becoming pale yellow. 



Figure 27. — Achelous Sebce, about }^ nat. size ; b, abdomen of male. 

 A. M.-Edwards. 



After 



It is said to be the only species having an upright spine on the 

 basal joint of the swimming legs. 



The chelffi have two distal dorsal spines, one behind the other. 

 The middle two frontal teeth are a little more prominent than the 

 outer ones, which are more acute. The inner orbital tooth is acute. 

 The posterior lateral tooth is sharp, rather long, somewhat curved 

 forward, and bears the small preceding tooth on the inijer basal 

 portion. 



In life the carapace and legs are closely pubescent and the legs 

 and chelipeds are fringed with longer red hairs. The merus of the 



