Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 47 



chela and the strong, stocky ambulatory legs, the left one of the sec- 

 ond pair having the propodus wide, compressed. The eyestalks are 

 also compressed but much less so than in the American west coast spe- 

 cies, C. compressus. 



Type: Herbst's type came from the East Indies, according to his 

 text. However, Doflein pointed out that the type in the Berlin Mu- 

 seum was unquestionably the West Indian species. 



Distribution : Confined to the West Indian f aunal region, having 

 been repeatedly recorded from southern Florida and the Keys and 

 nearly all of the West Indian Islands, as far south as northern Brazil. 

 One fossil specimen from Bermuda in the shell, Livona pica, has been 

 reported by Dr. A. E. Verrill and is deposited in the Peabody Museum, 

 Yale University. 



Material examined : Two specimens from the shores of Corrientes 

 Bay, Cuba, February 22, 1924, collected by William K. Vanderbilt; 

 one specimen (dry) from the Florida Reefs, 1923. 



Color: In life this species is bright red, except the great claw, 

 which is a vivid purplish-blue. 



Technical description : Carapace twice as long as wide, precervi- 

 cal region about as long as the postcervical, subrectangular with the 

 lateral margins converging slightly anteriorly and terminating in an 

 acute tooth between which the frontal margin is nearly straight, with- 

 out a median point ; the sidewalls are almost at right angles with the 

 dorsal surface and are hard, calcareous; on the upper surface there 

 are numerous coarse punctae and along the lateral margin a few fine 

 cilia. The postcervical region widens posteriorly and has the post- 

 lateral angles forming rounded lobes ; the upper surface is calcareous 

 and the lateral walls are covered by a tough membrane and set 

 sparsely with short setae. 



The abdomen is covered with a tough integument and bears on its 

 upper surface thickened semicalcareous wrinkles, indicating the ob- 

 solete segmentation; the pretelsonic segment and telson are small, 

 calcareous and bent under, forming a device by which the crab holds 

 onto the shell house. The pretelsonic segment bears a semioval cal- 

 careous plate on the upper surface ; the proximal part of the telson is 

 unequal-sided, being much shorter on the left side; the distal section 

 is also lopsided, the right side being the smaller, its lateral margins 

 each have a median incision, on either side of which the margin is 



