86 Addison E. V err ill, 



inner surfaces of the fingers have a slender groove and carina. 

 The median carina of the fixed finger becomes more prominent, 

 with a raised sharp edge, on the distal third. 



The rostrum is a stout, tapering, flattened, triquetral spine. 

 The ocular lobe has a small slender spine. The basal antennal 

 spine is rudimentary or small. 



On the outer distal margin of the outer branch of the uropods 

 there is a small black spine, which usually retains its color a long 

 time in preserved specimens. It is less conspicuous than the 

 similar spine of A. nigrospinatus Ran., of the Bahamas. Several 

 other species have the same spine black or dark. 



We found this large species common at Bermuda, especially in 

 holes and crevices in rotten limestone and dead corals on the reefs. 

 It was also contained in the early collections of J. M. Jones and 

 Dr. G. Brown Goode. Key West (Gibbes) ; Cuba (Guerin) ; 

 Natal to Maceio and Pernambuco, Brazil ; and Porto Rico, 4 to 6 

 fathoms (Rathbun). 



Gibbes (op. cit.) gave only a brief description of this species, 

 but as he mentioned particularly the strong rostrum, stout at base, 

 the orbital spine, and the simple large chela without grooves or 

 notches, there can be no doubt about the identification of his 

 species. 



The Alphcus wcbstcri Kingsley was described in nearly the 

 same terms, but Prof. Kingsley mentioned, in addition, the oblique 

 impressed line that bounds the supero-proximal area of the large 

 chela and the black uropodal spine. The oblique impressed line. 

 which is present in all other species, is not always distinct in 

 alcoholic specimens, unless allowed to partially dry, and the black 

 spine often fades out in alcohol. It is smaller and much less con- 

 spicuous than in A. nigro-spinatus Rankin, of the West Indies. 

 Prof. Kingsley had erroneously placed A. formosus as a synonym 

 of A. minus, and was, therefore, naturally led to describe the real 

 formosus as a new species. They are perfectly identical. 



Alpheus poeyi Guerin seems to be allied to or identical with this. 

 Some of his figures are reproduced on our plate XXV, figs. 6-60. 

 The chela, as figured, is longer and differently shaped. 



Synalpheus Bate. Smaller Snapping Shrimps. 



Synalpheus Bate, Voyage of Challenger, Rep. Zool., vol. xxiv, p. 572, 

 >.* Coutiere, Ann. Sci. Nat., ser. 8, Zool., vol. ix, pp. 154, 334, 



