’ 
442 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
indistinct articulations, while the four or five distal ones are separated 
by conspicuous articulations, of which the ultimate is about twice as 
long as broad, but the next three or four, each, only about half as long 
as broad. The chela is slender, only a very little stouter than the distal 
end of the carpus, nearly a third as long as the carpus, and about half 
as long as the merus, and the digits are alike, about as long as the basal 
portion, slightly gaping, and with a very few long, setiform hairs. The 
third, fourth, and fifth pairs of legs are exceedingly slender, sparsely 
armed with minute spinules and slender sets; and the dactyli are very 
long and slender, slightly and regularly bent, and flattened a little verti- 
cally (or in the direction of the plane of the cervature), and wholly un- 
armed; the fifth pair reach beyond the tip of the rostrum, and the fourth 
and third pairs are successively a little longer; the dactylus in the fifth 
pair is a third or a little more than a third as long as the propodus, in 
the fourth pair a little longer than in the fifth, and in the third pair not 
far from half as long as the propodus. 
The abdomen is evenly rounded and not at all compressed above, and 
less geniculated at the third segment than in P. Montagui. The sixth 
segment is about once and two-thirds as long as the fifth. The telson is 
about once and a half as long as the sixth segment, and terminates in an 
acutely triangular tip, armed each side with two long spines, of which 
the proximal is very much the longer, and at the extreme tip with a few 
long, plumose sete. 
Measurements. 
z Set Se | = 
Bigs ee lao llpers 
3 i E=| es 5 ae re 2, He 
2 Station. — ee ehte| 58 ~ A 
8 yi a | #3 ae ge 2S 
= @ 8) am Ow fe) S) ow 
A 7) 4 oO 4 a) ei} 
mm mm mm mm 
446 
Hee wot block Islands sass a seme caste siceiieciee seis ae rot 42 19.2 10.0 5.1 oe 
347 
22870 OH / BOCK TSland jaocao cease seccescmaccceseeees. fof 50 22.0 11.8 6.2 iad 
3+46 
3.4878 off Blocklsland te cccc accnmesscceensiclcisiencicie= 2 40 16.5 8.3 5.0 aah 
2+6 
A4087908 Block Island = sa.ccviseiewieccerceinceceesinecsics Q 61 25.0 12.8 8.0 rr 
