268 NATURAL HISTORY BULLETIN. 



71. PlLUMNUS GEMMATUS SUmpSOU. 



Dry Tortugas. 



72. Pilumnus pannosus Rathbun =P. gemmatus A. Milne 



Edwards not Stimpson. 



Bahama Banks, from millepores. 



73. Pilumnus holosericus Rathbun sp. nov. PI. v, Fig. 1. 

 Egg Island, Bahamas; one male. 



Densely pubescent; carapace tuber cnlate; lateral teeth obtuse; 

 large hand partially bare outside. 



Allied to P. gemmatus Stimpson and P . pannosus Rathbun. 

 Carapace more oval than in those species. Surface covered 

 with a short, smooth velvety pubescence which does not con- 

 ceal the boundaries of the areolations. On either side of the 

 gastric region there is a tuft of long hairs. Antero-lateral 

 teeth shorter than in gemmatus or pannosus and blunt, even 

 when the pubescence is removed. Tubercles of the carapace 

 and chelipeds smaller and more numerous than in the allied 

 species. Larger hand with the lower and distal portion of 

 the outer surface bare and unarmed, but this space is smaller 

 than in pannosus. Fingers shorter than in that species. 

 Smaller hand with entire outer surface pubescent and hairy. 

 Ambulatory legs pubescent and fringed with long hairs. 



Dimensions. — Length of male, 6.1; width 8.3 mm. 



Distribution. — Type locality, St. Thomas, one male received 

 from the Copenhagen Museum (U. S. Nat. Mus. No. 19,705). 

 A smaller specimen, also a male, was taken at St. Thomas by 

 the "Albatross." A larger specimen, a male, 6.8 mm. long 

 and 9.1 wide, was collected at Egg Island, Bahamas, by the 

 University Expedition. Several specimens are in the Museum 

 at Copenhagen, including one from St. John, West Indies. 



This species need not be confused with pannosus which has 

 a much more ragged appearance; nor with gemmatus which 

 is a considerably longer species and has the entire outer sur- 

 face of both hands tuberculate. 



