434 A. E. Vcrrill Decapod Crustacea of Benmnli. 



Petrolisthes armatus (<iibb'n) Stimp. 



PorceUatui armata Gibbes, op. cit., p. 19<i. is.'.u. 



r<-ti-<>lixtlu-x armatus Sthnpson, Proc. Acad. Nat. Sri.. 1'liilad., 18oH, p. ,'.-; . 



Ann. Lye. Nat. Hist. N. York, vii, p. 7:!. isiio. Kin-slry, Proc. Acad. Nat. 



Sci., Philad., 1879, p. 406. Ortuiann. Zoi',1. .lj.hr.. x. p. 380, Is'.i?. tone- 



diet, Anomura Porto Rico, p. 138, 



PLATE XXVII, FIGURE :}. PLATI: XXVIII. Ki..ritK 4. 



Color variable; carapace, in life, often yellowish green, with 

 minute white spots, legs similar, except <>n the la-t two joints, which 

 have white transverse bands ; under surface- pale yellow or white, 

 except the large chela-, which are pale blue (('. S. Y.I. 



Some specimens an- dark -ray above, finely spotted with white 

 and light gray. Others are red or reddish bro\\-n. thickly specked 

 and spotted with white or yellou i-h white. 



The colors are imitative of the sand, -ravel, stones, alga', etc. 



The median tooth of the front is obtuse. There i- a very distinct, 

 transverse, granulated ridge across the front. The merus of the 

 chelipeds usually has three (rarely 1) -harp teetl ..... the inner mar- 

 gin; the outer margin is finely serrulate. 



The chela- are large, flat, angular; the maim- has a distinct, granu- 

 lated, raised line on the outside. 



One of our larger male specimen- ha- the carapace 1 1 ..">""" long ; 

 9.5 mm broad ; between orbits, 5 mm ; merus of cheliped-, io mm long; 

 larger chela, 18 mm long; 7.3 mi " high. The larger chela i- stouter than 

 the other, with shorter and stouter digit-, which are laterally 

 incurved and slightly crossed at the tips. 



Variety pallidus, nov. 



Many Bermuda specimens differ from the ordinary form in having 

 the carapace nearly smooth, with scarcely any traces of the trans- 

 verse rugse and granules, so conspicuous in the typical form, and 

 in lacking the coarse granules on the outer surface of the chela-. 



O ._> 



The color is usually white or pale yellow. The chela? are the same 

 in form and carinse, and the merus of the chelipeds has three sharp, 

 spaced teeth on the front edge, as in anaatus. In most other 

 respects there are no differences between them. Whether it has the 

 same habits was not noted. Length of carapace, S-10 ram . 



This species is very common at Bermuda. It lives under stones 

 and in the interstices and crevices of dead corals, etc. It was in the 

 early collections of J. M. Jones, and has been taken by nearly all 



