‘2 
436 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
like Norvegicus, while the sculpture of the distal somites of the abdo- 
men is more like spinosus. 
The dorsal carina of the carapax is armed with three spines, and 
usually a smaller fourth one in front of the others and just back of the 
base of the rostrum; the subdorsal carina is armed with two spines, as 
in Norvegicus, and often with a rudiment of a third behind these; the 
lateral carina does not extend back of the middle of the carapax, and is 
armed with a single spine, as in Norvegicus. There are no distinct car- 
in on the first four somites of the abdomen, but the fifth somite is flat- 
tened above and has subdorsal carinze slighty, diverging posteriorly, and 
below these, each side, another carina, nearly parallel with the subdor- 
sal; and the sixth somite is flattened above and subdorsally carinated, 
as in spinosus, though the carinz are not quite as conspicuous on either 
somite as in that species. 
The eyes, antennule, and antenne are very nearly as in P. spinosus. 
The external maxillipeds reach a little beyond the tips of the chelipeds, 
the penultimate segment reaches nearly to the tip of the antennal scale, 
and the ultimate segment is a little less than twice as long as the penul- 
timate, while in P. Norvegicus it is about once and a half as long, and in 
P. spinosus much more than twice as long, as the the penultimate seg- 
ment. The thoracic legs differ scarcely at all from those of P. spinosus. 
The lamellze of the uropods are very nearly as in P. spinosus. The 
inner lamella reaches nearly or quite to the tip of the telson, is lanceo- 
late, and six or seven times as long as broad; the outer lamella is about 
a tenth shorter than the inner and about four times as long as broad. 
The telson is once and a fourth to once and two-fifths as long as the 
sixth somite of the abdomen, is very narrow, slightly acuminate, and 
has a very narrow and acutely triangular tip, armed with only two very 
long,.slender, and plumose setz, which arise near together from the 
under side. 
This species appears to be much smaller than either Norvegicus or 
spinosus. The following measurements are from two of the larger speci- 
mens: 
Length from tip of rostrum to end of telson ....-.-.------ 
Length of carapax along dorsum.....--.--.-.----------- - 
Length of rostrum in front of the back of the orbit..... 
Breadth of carapax at anterior margin .....-......-..---+- 
Greatest breadth of carapax 
ienothiorsixth somite of. abdomen... )- -lasc- = cision sector eect trseeeiee le tonic eben die aes eet 
Breadthyor the same in the middle - 3-2 c= eeer omens eo rake eee rele lame ielele ae alae 
eee eee ee eee ee ee ee eee ee ee ee ee or) 
PAP UNM SOSS 
RPoowronaud” 
Stations 865 to 867, 870 to 874, 877, 878; 65 to 155 fathoms. At most 
of these stations it was taken in great abundance. 
