S. L Smith on Brazilian Crustacea. 23 



(Ilistoire Naturelle des Crust., tome ii, p. 297, pi. 23, fig. 1 and 2,) has 

 tlie thoracic legs of the second pair longer than those of the third ; 

 he also states that the ti-ansverse sulci of the abdomen are not inter- 

 rupted on the first three segments ; and raoreovei', in his figures no 

 spines are indicated upon the bases of the antennae, or upon the coxae 

 of the posterior thoracic legs, and the flagella of the antennaa and the 

 antennulrc are much shorter than in our species. 



Heller (op. cit., p. 95) and DeHaan (op. cit., p. 159), both state that 

 in the guttatus the spaces between the spines of the carapax are 

 smooth, while in our species they are tubei'ctilose and hairy. Neither 

 Edwards, De Ilaan nor Heller mention the sub-cheliform posterior 

 thoracic legs as a character of the female of P. guttatus. 



Aipheus heterochelis Say. 



Alphsus heterochelis Say, Journal Acad. N'at. Sci., Philadelphia, vol. i, p. 243, 1818; 



Edwards, Histou'e naturelle des Crust, tome ii, p. 356; Gibbes, loc. cit, p. 196. 

 Aipheus armiUaiics Edwards?, Histoire naturelle des Crust, tome ii, p. 354, 1837. 

 Aipheus lutarius Saussure, op. cit, p. 45, pi. 3, fig. 24, 1858. 



A large number of specimens collected at the Reefs of the Abrolhos 

 agree perfectly with specimens from Florida and Aspinwall. 



Palsemon Jamaicensis Olivier. 



Cancer {Astacus) Jamaicensis Herbst, op. cit, Band ii, p. 57, Tab. 2T, fig. 2, 1796. 

 Paloemon Jamaicensis Olivier, Encyclop., tome viii, (teste Edwards,) ; Desmarest, op. 

 cit., p. 237 ; Edwards, Histoire naturelle des Crust, tome ii, p. 398, Regne animal 

 de Cuvier, 3^ edit, pi. 3, fig. 4 ; Saussure, op. cit, p. 49. 



Of this species there are in the collection two specimens, both 

 males, from Penedo, Rio Sao Francisco. 



In both specimens the rostrum is stout, a little shorter than the 

 antennal scale, and is armed above with twelve, and below with four 

 teeth. The anterior legs are longer than the carapax, and nearly 

 naked, except a few fascicles of hairs on the fingers ; the hands are 

 slender, and about half as long as the carpus, which is sliglitly shorter 

 than the merus. In the smaller specimen the second pair of legs are 

 equal, stout, very long, and thickly beset with small spines; the 

 hands are cylindrical, much longer than the carapax, and the fingers 

 half as long as the palmary portion of the hand. In the larger speci- 

 men the legs of the second pair are quite unequal, the left one being 

 considerably longer and much stouter than the right, and the fingers 

 only a third as long as the palmary portion ; the right hand is much 

 as in the other specimen, but considerably smaller iu proportion. In 

 both specimens the penultimate segment of the abdomen is broad, 



