Boone, Crustacea, Cruises of ''Eagle" and "Ara," 1921-28 71 



Type: The type was collected at Trinidad by the United States 

 Bureau of Fisheries steamer "Albatross" and is deposited in the 

 United States National Museum. 



Distribution : Hitherto known only from the type taken at Trini- 

 dad and eight specimens taken at Caracas Bay, Curagao, in coral, 

 Meandra and from between the roots of a Gorgonian. Thus the 

 "Ara" material substantially extends the northern range of the 

 species. 



Material examined: Five specimens dredged in 20 fms., south of 

 Sand Key, Key West, Florida, January 25, 1924, by the "Ara." 



Technical description : Carapace wider than long, 5.1 mm. wide, 

 4 mm. long, interorbital margin 2 mm. wide, frontal margin appar- 

 ently straight in a dorsal view but actually produced in the median 

 line to a little point and slightly concave on either side, when viewed 

 from the under side. The preorbital angle is approximately right- 

 angled and the postorbital angle is slightly obtuse, the acuminate tip 

 bent down close between the eye and the antennal base. The antero- 

 lateral margin is only moderately arcuate, the branchial regions 

 tumid, the sidewalls prominent, the posterior margin slightly sinuate 

 and carinate. The dorsal surface is longitudinally convex ; there are a 

 pair of low, transverse elevations on the mesogastric region; the cer- 

 vical groove is well defined, a line runs out onto the branchial region 

 from the urogastric region; the hepatic and branchial regions, par- 

 ticularly on the posterior half, are covered by a series of coarse, trans- 

 verse rugae. The abdomen is broad, with all the segments well de- 

 veloped ; the first and second segments have the lateral margins taper- 

 ing, rounded ; the third, fourth and fifth segments have this margin 

 relatively straight; the sixth segment is smaller than the fifth, with 

 the postlateral margin excavate ; the telson is rounded, with the basal 

 section triangular, the remaining sections wedge-shaped, like four 

 slices of pie, the suture between the proximal and distal pair of sec- 

 tions being nearly straight. The uropoda have the peduncular joint 

 short and wide ; the blades are nearly equal, elongate-ovate, but with 

 the distal half slightly the wider ; the margins are ciliated. 



The eye has a very short stalk, only the calcareous edge of which 

 shows; the cornea is spherical, large, completely filling the ocular 

 cavity. 



The antennulae are slender and fold transversely within the fossett 

 beneath the frontal border. 



