7 6 Addison E. Verrill, 



Florida (Coutiere) ; Beaufort, N. C. (Hay and Shore) ; Porto 

 Rico (Rathbun) ; Brazil (Coutiere) ; Colon (Yale Mus., No. 484). 



A peculiar specimen, perhaps a .variety or a distinct species, 

 comes from Colon. (No. 735~b.) See plate 48, figs. 2-211. In 

 this the rostrum is preceded by a low, wide, flat tooth, obtuse at 

 the tip. It makes a distinct notch in front of it, at the base of 

 the rostrum. In a profile view its upper margin overhangs so that 

 there is a cavity all around it. The rostrum is slightly lanceolate 

 and has a deep fossa on each side, much as in armillatns. The eye 

 lobes are prominent with a slight elevation in front. Edge of 

 front, between the eyes, is nearly straight, without the emargina- 

 tions seen in typical armillatus. 



The basicerite is a minute acute spine; scaphocerite is large, 

 its spine strong, a little longer than the carpocerite and equal to 

 or exceeding the antennular stalk. Stylocerite is small, not very 

 acute, and does not reach the end of the first segment. It is 

 shorter than the rostrum. 



The third maxilliped (pi. 48, figs. 2, 2") is covered with unusu- 

 ally long hairs distally ; the exopod appeared to be divided distally 

 into two slender annulated flagella. Legs of the second pair are 

 long, slender; first and second articles of the carpus are long. 

 Propodus of third legs have numerous spines beneath (fig. 2b) ; 

 its dactyl is elongated and little curved ; legs of fifth pair (fig. 2c) 

 are more slender, brush of hairs on the propodus is not very long ; 

 dactyl is long and slender. Large cheliped is lacking. 



Alpheus heterochaelis Say, or Crangon heterochaelis. Big-clawed Snap- 

 ping Shrimp. 



Alpheus heteroch&lis Say, Journal Acad. Nat. Sci. Philad., vol. i, p. 243, 

 1818. M.-Edwards, Hist. Nat. des Crust., ii, p. 356, 1837. Gibbes, loc. 

 cit, p. 196. Kingsley (pars), Synopsis N. Amer. sp. Alpheus, Bull. 

 U. S. Geol. and Geog. Survey, iv, p. 194, 1878 (description) ; List 

 Caridea, Bull. Essex Inst, x, p. 58, 1878; Proc. Acad. Nat. Sci. Philad., 

 for 1880, p. 417 (pars) ; Carcinological Notes, No. v, Bull. Essex Inst., 

 xiv, p. 120 (16), 1883. Brooks and Herrick (pars), Johns Hopkins 

 Univ. Circ., vol. xi, pp. 69, 70, 1892 (life history) ; Mem. Nat. Acad. 

 Sci., v, pp. 361-463; pi. ii (colored), pis. xvi-xx, 1892. (Embryology 

 and life history.) Rathbun, M. J., Proc. Wash. Acad. Sci., ii, p. 152, 

 1900; Brachy. and Macr. of Porto -Rico, p. 107, 1901 (pars). Coutiere, 

 op. cit, 1910, p. 485. 



Crangon heterochcelis Hay and Shore, op. cit., p. 386, pi. 26, fig. 6, 1918. 

 Alpheus lutarius Saussure, op. cit., p. 45, pi. iii, figs. 24-24*', 1858. 



