776 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



Fig. 6.— Operculum of Pylo- 

 cheles partitus. x 3. 



others are equal or subequal; from the large spine the margin slopes 

 rapidly to the hand; the direction of the crest is perpendicular to 

 the plain of the hand. A sulcus runs along the ridge of the carpus 

 into the notch. The palm is broad arcuate on the outside, straight on 

 the inside; the surface is flat. The largest spines are on the inside 

 margin of the palm; there are three spines on the dact3'l near its 

 base; beyond this the margin is granular rather than spiny. Scattered 

 over the surface of the hand are numerous but well separated bristle- 

 bearing granules; behind the lingers the granules are arranged in more 

 or less regular rows; elsewhere the granules 

 are more numerous and irregular. The ex- 

 posed surfaces of the hand and the crest of the 

 carpus are well covered with stiff bristles. 



The segments of the abdomen are slightly 

 calcified and very hairy. The telson is about as 

 in Pylocheles agassizii Milne-Edwards, except 

 that the articles are markedly longer in pro- 

 portion than are shown in the figures of that 

 species. 



Type. — One specimen, a male, is labeled 

 "Cozumel in a sponge Jan. 29th, 1885, Alba- 

 tross'', U.S.N.M. No. 9892. "Length, 45 mm. from the end of the 

 chelipeds to the end of the telson. Length of the carapace 10 mm. 

 Length of the abdomen to the end of the telson 20 mm. U.S.N.M. 

 No. 9901. 



A second specimen, a female, was taken by the U. S. Fish Commis- 

 sion steamer Alhatross off Habana, station 2348, 23° 10' 39" north lati- 

 tude, 82° 20' 21' west longitude, in 211 fathoms. Length of carapace 

 7.5 mm. 



This species is closely related to Pylocheles agassizii A. Milne- 

 Edwards. A comparison of the specimens with the plate ^ brings out 

 the following strong characters by which they may be separated: 



In Pyloclidcii agassizii the projections of the front are weak. The 

 sinus behind the eye is shallow and evenly rounded. The acicle is 

 figured as broad and notched or toothed on each side, while in PyJocJie- 

 les jMirt it us the acicle is narrow and has but three spines, including the 

 terminal spine. The spinules of the inside margin are so small that 

 they can not be well made out without a lens. The carpal crests differ 

 greatly in shape. Pylocheles agassizii has no notch nor has it a sulcus 

 running along the upper margin of the carpus. 



^A. Miliie-E(l wards et E. L. Bouvier, Mem. Mus. Comp. Zool., XIV, No. 3, p. 20, 

 pi. I, April, 1893. 



