94 



BULLETIN 12&^ UNITED STATES NATIONAL MUSEUM 



the confluence of these 

 granules forming inter- 

 vening pits or depres- 

 sions in the old. 



Measurements. — M ale 

 (24150), length of cara- 

 pace to tips of ros- 

 trum 7.4, width of car- 

 apace 6 mm. Female 

 (15164), length of car- 

 apace 8.5, width 6.5 

 mm. 



Variations. — The 

 Porto Rican and St. 

 Thomas specimens are 

 more delicate than 

 those from the Gulf. 

 The four conical eleva- 

 tions of the carapace, 

 gastric, cardiac and 

 branchial (paired), are 

 less high, but the sm*- 

 mounting spines are 

 longer and slenderer, 

 and the branchial 

 spines tend to be less 

 erect, more divergent. 

 Besides the variations 

 in the abdomen, al- 

 ready mentioned, the 

 supraorbital spines 

 vary in direction, being 

 either slightly diverg- 

 ent, parallel, or con- 

 vergent. 



Range. — Bahama 

 Banks; Straits of Flori- . 

 da; Gulf of Mexico; St. 

 Thomas and Porto 

 Rico ; Island of Fernan- 

 do Noronha, Brazil. . 

 Depth, 7 to 37 fathoms. 

 Material examined. — • 

 See table, page 94. 



