Boone, Crustacea, Cruises of ''Eagle" and "Ara," 1921-28 171 



as long as the propodus, curved, laterally concave, acuminate. The 



fifth pair of legs is substantially shorter than the fourth, but otherwise 



similar. 



Synonymy. — Alpheus armillatus H. Milne Edwards, Hist. Nat. 

 Crust., vol. II, p. 354, 1837. — Coutiere, Ann. Sci. Nat., series 8, 

 vol. 9, p. 129, fig. 117, 1899 ; Proc. U. S. Nat. Mus., vol. 37, p. 485, 

 1910. — ^Verrill, Trans. Conn. Arts and Sci., vol. 26, p. 73, pi. 20, 

 fig. 4b, pi. 21, figs. 4-4a, pi. 26, figs. 1-ld, pi. 27, figs. 1-ls, 1922. 



Alpheus lancirostris Rankin, Ann. N. Y. Acad. Sci., vol. 12, p. 541, 

 pi. 17, fig. 5, pi. 17, fig. 5, 1900. 



Crangon armillatus Hay and Shore, Bull. U. S. Bur. Fish., vol. 35, p. 

 386, pi. 27, fig. 1, text fig. 9, 1918. — Schmitt, Univ. Iowa Studies 

 Nat. Hist., vol. 10, No. 4, p. 76, 1924. 



Alpheus heterochaelis Say. 



Plate 61. 



Type: Say founded the species on material from South Carolina 

 and a specimen from Amelia Island, Florida. 



Distribution: Known from Beaufort, N. C, southward through- 

 out the West Indian region to Maceio, Brazil. Taken at the Bermudas, 

 in Porto Rico, Curagao and Barbados. 



Material examined : Two specimens taken at Pigeon Key, Florida, 

 by the ''Ara," William K. Vanderbilt, commanding. 



Color : See the color plate of Brooks and Herrick. 



Technical description : Animal robust, superficially resembling 

 C. armillatus, from which it may at once be separated by the different 

 rostrum, and differently placed grooves on the cheliped. The rostrum 

 is simple, a linear ridge, projecting the distal third of its length be- 

 yond the frontal margin as an acute spine and continuous posteriorly 

 as far as the base of the orbital lobes, from which it is separated by 

 a deep sulcus ; the ocular lobe is convex, rounded on the frontal mar- 

 gin. The carapace and abdominal segments are very similar to those 

 of C. armillatus except that the telson of C. heterochaelis is substan- 

 tially wider in proportion to its length than is that of an armillatus 

 of the same size and sex. 



The antennulae have the first article two-thirds as long as the sec- 

 ond, and the second article twice as long as the third article. 



The antennae have the scaphocerite with a shorter, acuminate tooth 

 at the distal margin and the scale slightly wider, and its distal half 

 with the margin more rounded than does armillatus; the carpocerite 



