eee | PROCEEDINGS OF THE NATIONAL MUSEUM. 245 
and do not converge. The comparative length of the rostrum in the 
two forms is, therefore, not constant. Most of the tuberculous forms 
have more divergent horns and greater interorbital breadth, but a 
specimen from Pensacola offers an exception to this rule, having 
horns no more divergent and a frontal breadth no greater than in the 
typical cornuta. There is then no additional character by which the 
tuberculous forms can be separated from the smooth. A. Milne Ed- 
wards’s specimen was 36 millimeters long, including the rostrum. We 
have specimens of the same size which agree well with his description 
and figure; but larger specimens differ in having a number of the tu- 
bereles spiny; in all cases, however, the tubercles are disposed as in 
the typical cornuta. 
In the collection of the museum, P. cornuta celata ranges from 21 to 
30 fathoms in the Gulf of Mexico and Caribbean Sea (A. Milne Edwards 
records it from 175 fathoms); while cornuta is found in shallower water. 
The young specimens of both varieties it is almost impossible to sep- 
arate, and under the supposition that the variation in the adults is the 
result of the different range in depth, I propose to make the deep water 
form a subspecies of cornuta as the best arrangement that can be made 
with our present knowledge. 
Length of largest specimen, from tip of rostrum te tip of posterior 
spine, 91; width, including spines, about 65; width, without spines, 
47.5; length of rostrum, about 50; length of cheliped, 87 millimeters, 
RECORD OF SPECIMENS EXAMINED. 
Pensacola, Florida, from stomach of fish; Silas Stearns (4505, 9373). 
Gulf of Mexico; U.S. Fish Commission, 1885, 1889: 
| ). 
Cat. No.| Station. | Lat. N. | Long. W. pie Nature of bottom. 
° / “a Oo fe he 
16045 | 2370 | 291815] 85 32 00 25 | ers. gy. 8. brk. Sh. 
15144 2373 29 14 00 85 29 15 25 Co. — 
15145 2374 29 11 30 85 29 00 26 S. G. brk. Sh. 
15147 2405 | 284500} 85 02 00 30 | gy. 5S. brk. Co. 
15146 2406 | 284600) 84 49 00 26 crs. S. Co. 
9803 2407 28 47 30 84 37 00 24 | Co. brk. Sh. 
15148 2409 27 04 00 | 83 21 15 26 | ers. gy. S. brk, Sh. 
15205 5110 26 19 00 82 50 00 21 Sh. 8. bk. Sp. 
15150 2412 26 18 30 83 08 45 27 | tne. gy. 8S. bk. Sp. brk. Sh. 
15149 2413 26 00 00 82 57 30 24 | tne. S. bk. Sp. brk. Sh. 
16068 5070 25 23 00 82 54 30 264 | Sh. 8. 
15276 5063 25 17 00 32 54 30 27 =| Sh. 8. 
9847 2414 25 04 30 82 59 15 26 | fne. wh. S. brk. Sh. 
Off Cape Catoche, Yucatan; U. 8. Fish Commision, 1885: 
Cat. No. | Station. | Lat. N. | Long. w. | Fath: Nature of bottom. 
PEE otoor NOt ulead A Aa ee i i be ere ESE oe 
! 
Oo ‘ us (8) , iy 
9592 2366 | 22 28 00| 87 02 00 27 | fue wh. Co. 
16051 2365 | 22 18 00| 87 04 00 24 | wh. R. Co. 
9567 2360 | 22 08 30 | 86 49 00 26 | wh. Co. 
15143 2363 | 220730! 870600| 21| wh. R. Co. 
