16 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
Specimens examined—Continued. 
z | 
a : No. of speci- 
3 = mens. 
Locality. = = 
S & e ; 
Fi = | Nature of bottom. Ss ee 
=| g a} ° f 
3 N. lat. W. long. | F eve = 
= o ae = 
a A = = 
OFF MARTHA’S VINEYARD 
Continned. 
°o ‘ “ ° ‘ a 1881. 
937 | 39 49 25 69 49 00 | 616 gn. S. M. Aug. 4| 4 
945 39 58 00 71 13 00 207 gn. M.S Aug. 9 1 1 0 
946 | 39 55 30 71 14 00 247 gn. M.S Aug. 9 1 0 
947 39 53 30 71 13 30 319 S. M | Aug. 9 2 2 0 
952 39 55 00 70 28 00 396 yl. M. S Aug. 23 1 0 
994 39 40 00 71 30 00 368 M Sept. 8 1 
1029 | 39 57 06 69 16 00 | 458 yl. M.S, Sept. 14] 1 
1882. 
1124, 40 01 00 68 54 00 640 fne. 8. gn. M Aug. 26| 3 2 1 
1125; 40 03 00 68 56 00 ; 291 S. M. Aug. 26 
1140 39 34 00 71, 56. 00! ||) (374 sft. M. P. Sept. 8| 7 2 0 
1142 | 39 32 00 72 00 00 322 S. M. P. Sept. 8 1 ae 0 
1143 |} 39 29 00 72 01 00 452 sft. M. Sept. 8! 1 
OFF DELAWARE BAY. 
1881. 
1049 | 88 28 00 73 22 00 435 M. Oct. 10.| 2 if 
In the Blake dredgings of 1880 the species was taken at the following 
stations : 
Station. N. lat. W.long. | Fathoms. Specimens. 
| 
oO ’ u" oO ’ “ 
325 33 35 20 26:2740) 7 10 647 1g 
332 385 45 30 74 48 #O 263 2c 
334 gf 38 20 30 | 73 26 40 395 22 
337 38 20 8 73 23 20 740 Fragments only. 
343 39 45 40 | 70 55 O 732 3 2 with eggs. - 
309 40 11 40 68 22 0 304 1 del el a 
312 39 50 45 102, AL 10 466 lg 
This species grows to be by far the largest brachyuran in our waters. 
The largest specimen which I have seen is from the Blake collection of 
1880, and was taken off Cape Hatteras. This specimen, measurements of 
the carapax of which are given in the last line of the following table of 
measurements, is more than six inches across the carapax and two feet 
across the outstretched legs. Very large individuals differ considerably 
from the specimens originally described. In all the large specimens the 
teeth of the antero-lateral margin of the carapax become reduced to an- 
gular tubercles, and in some of the larger ones the fourth tooth- becomes 
entirely obsolete. Specimens of the same size vary much, particularly the 
larger ones, in the prominence of the anterolateral teeth, so that the pro- 
pertional breadth of the carapax, including the teeth or spines, varies 
much more than the breadth excluding the teeth or spines, as shown 
in the table of measurements. This variation is partially due to the 
wearing away of the teeth, which probably takes place rapidly on 
account of the softness of the exoskeleton, which is much less caleareous 
than usual, the branchial regions of the carapax being so soft as to be 
readily bent or indented with the finger, 
