146 Addis on E. Verrill, 



It belongs to that section of the genus that Bate named Brachy- 

 carpus, on account of the short carpus of the second pair of legs. 



Reported from Bermuda by Bate. It was not taken there by 

 the Yale parties, nor by later collectors, so far as reported. Porto 

 Rico ; off Havana, 78 fathoms ; off Jamaica, 23 fathoms ; Curacao 

 (Rathbun) ; Bahamas (Rankin). 



Periclimenes Costa. 



Periclimenes Costa, Ann. Acad. Aspir. Nat. Nap., ii, i, 1846. 

 Borradaile, Ann. Mag. Nat. Hist., vol. ii, p. 380, 1898. 

 Rathbun, Brach. and Macrura, Porto Rico, p. 121, 1901. 



The carapace has antennal and hepatic spines. The rostrum is 

 elongated and compressed, nearly straight, usually more or less 

 dentate above and below; tip slender, acute. Antennulae are 

 biflagellate, the larger flagellum rather long, thick, and bifid ; stalk 

 is wide, excavate, with a large basal scale on the outer side. 

 Antennal scale long and rather large. 



Legs of first and second pairs slender with simple chelae ; second 

 pair the longer and larger, about as long as the body. Other legs 

 have acute dactyls. Telson narrow, tapered, subacute or acute, 

 with four dorsal and four or six terminal spines. The statocyst 

 contains a round concretion made up of concentric layers, without 

 any sand grains. 



This genus has been referred to the family Pontonidce by several 

 writers, but it seems to me more closely related to Palcemonidce. It 

 agrees pretty closely, in most of its characters, with Leander, 

 Pal&monella, Palcemonetes, etc. while it is quite unlike Pontonia 

 and allied genera, which have a small and mostly edentulous 

 rostrum. It has the rostrum, telson, an excavate antennal stalk 

 with a lamellate antennular scale, and a large antennal scale formed 

 much as in Leander, etc. It closely resembles Palcemonella. 



Periclimenes americanus (Kingsley) Borr. 



Anchistia wnericana Kingsley, Proc. Acad. Nat. Sci. Philad., xxx, 1878, 

 p. 96, 8 (Key West) ; Bull. Essex Inst., vol. x, p. 65 ; vol. xiv, p. 

 109, pi. ii, figs. lo-ioa, 1882; American Nat., xxxiii, p. 718, figs, xo-ioa. 



Periclimenes americanus Borradaile, Ann. Mag. Nat. Hist., ser. (7), vol. 

 ii, P- 383, 1898. Verrill, these Trans., x, p. 580, 1900, Bermuda. Rath- 

 bun, M. J., Brachyura and Macrura of Porto Rico, p. 121, 1901. 



