PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 3 
BRACHYURA. 
MAIOIDEA. 
Amathia Agassizii Smith, Bull. Mus. Comp. Zool., Cambridge, x, p. 1, pl. 2, figs. 2, 
3, 1882. 
Specimens examined. 
z ro No. of speci- 
3 a mens. 
Locality. = 3 
x es Nature of bottom. s o 
8 N. lat. W. long. 2 8 2 
2 5 = = og a 
3 a — 
a : s E 
OFF MARTHA’S VINEYARD. 
Sap aT o 7 u" 1881. 
939 | 39 53 00 69 50 30 264 gn. S. M. | Aug. 4)1 
1032} 39 56 00 69 22 00 | 208 yl. M. Sept. 14/1 ty. 
1882. 
1113 | 39 57 00 70 37 00 192 gn. M. Aug. 22 | 1 
1154 | 39 55 31 70 39 00 193 S. M. Oct. 413 
In the original description above referred to it is stated that this 
species resembles Amathia Carpentert Norman (Scyramathia Carpenteri 
A. M.-Edwards); it is, however, probably not closely allied or even 
congeneric with that species, but apparently closely allied to Amathia 
crassa A. M.-Edwards, and possibly identical with it. I was misled in 
regard to the armament of the carapax of Scyramathia Carpenteri by 
the woodcut given in the Depths of the Sea (no description of the species 
has yet appeared), for Milne-Edwards states that the species is closely 
allied to Scyra umbonata Stimpson, certainly a very different species from 
Amathia Agassizii, and has united them in his new genus Scyramathia. 
As indicated above, all the specimens seen are males. One of these 
is much larger than the larger of the two original specimens described 
and figured in my reportabove referred to, but differs very little from it, al- 
though the spines of the horizontal series on the branchial region, above 
_the bases of the cheliped and first ambulatory leg, are considerably 
longer, and there are two well-developed spines, instead of two or three 
small ones, on the lateral margin back of the anterior angle of the bue- 
cal area. Measurements of this specimen are given in the last column 
of the accompanying table of measurements. The other specimens show 
all gradations between this and the young specimens originally de- 
scribed. 
