A. E. Verrill — Decapod Crustacea of Bermuda. 403 



At Dominica Island, in 1906, Mr. A. H. Verrill obtained a number 

 of much larger perfect specimens, taken in fish-pots, in rather deep 

 water (40-150 fathoms) where it was associated Avith M. sjyitiosissi- 

 mus, of very large size, and other large spider crabs. 



It is a comparatively rare species, recoi'ded by few authors. A. 

 M.-Edwards knew only two specimens, from Martinique, in the 

 Paris Museum. It was not mentioned by Stimpson, nor was it in 

 the Porto Rico collection, studied by Miss Rathbun. It was not 

 represented in the large collections of the National Museum enumer- 

 ated by her in 1892. 



Mithrax (Nemausa) acuticornis (Stimpson). 



Mithrax acuticornis Stimpson, Bull. Mus. Comp. Zool., ii, p. 116, 1870. A. 



M.-Edw., Miss. Sci. Mex., v, p. 98, 1875. M. J. Rathbun, Amer. Naturalist, 



xxiv, p. 512,. fig. 8, 1900. 

 Nemausa rostrata A. M.-Edw., Miss. Sci. Mex., Part v, 1, p. 81, pi. xvii, figs. 



4r-4d, 1875. Miers, Voy. Challenger, Zool., p. 85, 1886 (Bermuda). 

 Mithrax [Nemausa) acuticornis M. J. Rathbun, Proc. U. S. Nat. Mus., xv, p. 



260, pi. xxxvii, fig. 1, 1892; Bull. Labr. Nat. Hist. Univ. Iowa, iv, p. 259, 



1898. Brach. and Macr. Porto Rico, p. 66, 1901. 



Figure 39. 



This species is characterized by its elongated and narrow carapace, 

 the sharp lateral spines, and especially the unusually long and acute 

 rostral horns. 



Figure 39. — Mithrax acuticornis ; c, the same, the carapace of a younger speci- 

 men, X aboiit three times. After A. M.-Edwards. 



Recorded from Bermuda by Miers (Voy. Chall.), but not obtained 

 by later collectors. Florida, West Indies and Gulf of Mexico, 

 shore ^o 164 fathoms. Off Key West, 60 fathoms (Rathbun). 



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