Boone, Crustacea, Cruises of ''Eagle" and "Ara," 1921-28 169 



Distribution : A reef dweller. Known throughout the "West Indian 

 region as far north as Beaufort, N. C, and southward to Brazil. 



Material examined : One specimen taken in dragnet in 2 fms., Port 

 Antonio, Jamaica, February 17, 1926, by the " Ara." 



Color: In life this sponge shrimp has the body brownish-grey, or 

 grey, somewhat darker on the abdomen, transversely banded with 

 nine, occasionally ten, elliptical, incomplete bands of creamy white, 

 of about the same width as the same alternating grey bands. On some 

 specimens the six creamy bands on the abdomen are bordered with a 

 fine line of orange, which line also frequently margins the caudal fan. 

 The antennal peduncle is greyish, the flagella and ambulatory legs 

 orange, banded alternately with white. The chelipeds are usually 

 pale, thickly speckled with grey with two or three transverse white 

 bands on the upper surface, the finger-tips either delicate salmon or 

 whitish. 



Technical description: Animal very robust; the great cheliped 

 large and superficially much like that of Crangon heterocJiaelis. Cara- 

 pace 11.5 mm. long, including the rostral tooth, which is 1 mm. long. 

 Kostral tooth slender, spine-like, projecting beyond the frontal margin 

 about one millimeter and continuing posteriorly as a ridge for about 

 twice that distance where the terminating ridge meets the apex of a 

 flat, lanceolate process whose lateral margins are sharply defined by a 

 ridge which is posteriorly confluent with the definition of the orbital 

 lobe which is convex dorsally, with the frontal margin also convex; 

 there is a sulcus on either side between the rostral ridge and the orbi- 

 tal lobe. The abdominal segments have the epimera only moderately 

 developed; the telson is one and two-fifths times as long as the sixth 

 segment, moderately tapered and rounded distally and ciliated, with 

 two pairs of submedian, short, articulated spines on the dorsal surface. 

 The caudal fan has each blade slightly longer than the telson, and 

 heavily ciliated marginally; the inner blade is wider than the telson, 

 broadly oval; its distal margin evenly rounded. The outer blade is 

 also oval but larger than the inner, with the distal portion transversely 

 articulated and a small spine on the distal angle of the lateral margin 

 of the proximal portion of the blade ; there is an oblique longitudinal 

 ridge on the dorsal surface of this blade. 



The antennulae have the basal article broad and scarcely extending 

 beyond the rostral spine ; the second article is one and one-half times 

 as long as the first, cylindrical ; the third peduncular article is scarcely 

 three-fifths as long as the second, stocky; the flagellum is biramose; 



