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440 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM — 
Right chelate leg. 
No.| Sex. | Length. | 
Length. | Ischium. Merus. Carpus. | Propodus. | Dactylus. No. segs, 
in carp. 
mm. mm. mm. mm. mm. mm. mm. 
1 fof 52 13 3.4 2.7 4.1 2.1 0.9 5 
2 fof 60 15 4.0 3. 2 4.5 2.6 ifal 5 
3 fof 75 22 5.2 4.9 7.0 3. 8 1.5 5 
6 2 80 23 5. 9 5.1 7.2 4.0 1.6 5 
10 2 90 24 6.6 5.3 7.6 3.9 1.6 5 
7 9) 82 20 5.5 4.4 6.5 3. 2 1.2 18 
4 fof 61 15 4.1 3.2 4.6 2.5 1.0 6 
5| ot 65 16 4.0 3.2 5. 0 2.5 1.0 8 
8 2 84 22 5.5 1.6 7.0 3.4 1.3 8 
Left chelate leg. 
No. | Sex. | Length. 
Length. | Ischium. Merus. Carpus. | Propodus. | Dactylus. No. segs. 
in carp 
mm. mm mm. mm mm mm. mm. 
1 rofl 52 24 5.5 4.5 10.1 ibit 0.6 53 
2 fof 60 27 6.5 5.9 12.3 1.2 0. 6 53 
3 fof 75 35 9. 0 8.0 15.0 1.9 0.9 58 
6 2 80 37 9.0 8.5 16.0 2.0 1.0 64 
10 2 90 41 10.3 8.8 18. 2 2.0 1.0 64 
7 °) 82 39 10.0 8.4 7.6 1.9 0.9 63. 
4; o 61 27 6.7 5.7 12. 2 ra 0.6 54 
3 fof 65 27 6.6 5.8 12.1 1.2 0.6 52 
8 Q 84 39 9.0 8.8 17.5 1.9 0.8 56. 
Station 870, 155 fathoms (abundant); 873, 100 fathoms; 878, 142 
fathoms (very abundant). It was also taken in abundance this season 
at many stations in shallow water off Rhode Island. 
In the dredgings off Cape Cod, in 1879, this species occurred at a 
great number of the stations, in 15 to 116 fathoms, and was very often 
associated with P. Montagui, and at 116 fathoms with P. propinquus. 
It was particularly abundant in 25 to 50 fathoms, several quarts of 
specimens often being taken at one haul of the trawl. In the dredgings 
previous to 1879 it occurred very much less abundantly, and was care- 
lessly confounded with P. Montagui, under which name specimens of P. 
leptocerus may have occasionally been distributed in the sets of speci- 
mens made up from the Fish Commission collections and distributed from 
the National Museum. In the dredgings of 1877—78, it occurred sparing- 
ly, in 22 to 48 fathoms, in Massachusetts Bay ; and in 75 to 90 fathoms, 
in the Gulf of Maine, off Cape Ann, in considerable abundance and of 
large size; in both localities associated with P. Montagui, and in the 
Gulf of Maine with P. borealis also. In Casco Bay, in 1873, a few 
specimens only were taken. Among great numbers of specimens of P. 
Montagui from the Bay of Fundy I have not succeeded in finding a 
single specimen of the new species, although it very likely occurs there. 
At Halifax, Nova Scotia, a few specimens only, most of them very 
small, were taken, and these were from 18 fathoms. In the region of 
George’s Banks, in 1872, it was taken in 30, 45, 50, 60, and 430 fathoms, 
