REPORT ON THE BRACHYURA 257 



31. Macrocceloma camptocerum {Stimpson). 



Stations 44 and 46. off Key West, 5^ fathoms. 



One male has unusually long rostral horns, over one-third 

 the entire length of the carapace. 



32. Macrocceloma diplacanthum (Stimpsori). 



Station 6S. off Little Cat Island, Bahamas, on the submerged 

 bank connecting it with Eleuthera. 3 to 13 fathoms. 



^^. Macrocceloma septemspinosum [Stimpson). 



Stations 24 and 27. off Key West, 50 to 60 fathoms; station 

 28, off Sand Key. 116 fathoms; Bahama Banks. 



34. Macrocceloma eutheca [Stimpson). 



Station 24. off Key West, 60 fathoms; one male; off Havana, 

 one young male; Bahama Banks, one male, one young 

 female. 



These specimens I believe to be Stimpson's Pcriccra 

 eutheca. In the largest male, from station 24, the rostral 

 horns are slender, parallel for one-half their length, with a 

 U-shaped interspace, tips slightly divergent. The orbital 

 sheath is prolonged far beyond the outer spine of the basal 

 antennal joint, and is tipped with three spines, one antero- 

 superior, one postero-inferior, the other postero-superior and 

 situated just in front of the superior closed sinus; in the ''Alba- 

 tross " specimens ( Proc. U. S. Nat. Mus.. 1S92, 251), the 

 sheath is shorter, projecting but little bevond the outer anten- 

 nal spine, and exclusive of the latter, is armed with four spines, 

 one antero-superior, one postero-inferior. one inferior, and the 

 fourth superior and behind the closed sinus. The carapace is 

 very narrow behind the orbits. The gastric, cardiac, and intes- 

 tinal prominences are spines. There is a spinule at the summit 

 of the branchial region and one strong spine at the lateral mar- 

 gin which is inserted in a transverse line with the cardiac spine. 



Dimensions. — Entire length. 27; length from between rostral 

 horns. 24: greatest width at orbits, 15.2; greatest branchial 

 width, 23; branchial width, without spines, 18; antero-lateral 

 width at narrowest point, 10 mm. 

 iv— 3 Y 



