196 BULLETIN OF THE 
Polycheles! tanneri, sp. nov. 
Orbital sinus rounded at the bottom, outer margin spinulose. Median carina 
of carapace furnished with two anterior rostral spines, followed by five (or six) 
spines in front of the cervical groove, the fourth (or fifth) of which is double. 
The arrangement of these spines may be thus formulated: 2. 1. 1. 1. 1. 2. 1 (or, 
2.1.1.1, 2.1). Back of the cervical groove the spines of the median carina are 
2.2.2. Marginal spines of carapace arranged as follows : 5—3—13 or 14). 
A longitudinal row of four small spinules on the anterior division of the 
carapace midway between the median and marginal rows, and arow of twelve 
or fifteen on the branchial regions inside the margin of the carapace. There 
are, besides, two or three spines on each side of the hind margin of the cara- 
pace, and a few along the cervical groove. 
Resembles P. nanus (Smith), but differs in the number of spines on the 
median and sublateral carinze of the carapace, in the existence of a spine on 
the antero-external angle of the first and second abdominal pleure, and in the 
greater number of spines on the merus, carpus, and propodus of the chelipeds. 
P. nanus, moreover, is described as having the posterior pair of thoracic ap- 
pendages chelate in the male, while in the males of P. tanneri that I have 
examined these appendages are simple. Compared with the types of P. agassizii 
(A. M. Edw.), the carapace of the present species is broader and fewer-spined 
on the margins; the first and second abdominal pleure are armed with an 
anterjor lateral spine ; the rostral spine is double ; and the orbital sinus is 
broad and rounded at the bottom. P. agassizit, like P. tanneri, has non-chelate 
posterior legs in the male. 
Station 3354. 322 fathoms. 1 male. 
Bu, aby 2 males, 1 female. 
We SEB R: Bisel oC 12 males, 14 females. 
e 3409. 327“ 1 female. 
Polycheles sculptus pacificus, subsp. nov. 
Differs from the Atlantic P. sculptus Smith as follows. The carapace is 
broader in proportion to the breadth of the abdomen, the lateral margins con- 
verging strongly at the posterior end, where, in P. sculptus, they continue 
nearly parallel to one another; there is a small spine on each branchial region 
inside of and on a level with the second spine of the submarginal carina, which 
spine is entirely wanting in P. sculptus; the spine on the anterior border of 
the ophthalmic lobe is larger and blunter; the pleure of the second abdominal 
somite have a different shape, their anterior margins being in line with the an- 
terior margin of the tergum, whereas in P. sculptus they form a strong obtuse 
angle with that margin. 
1 The genus Polycheles, as here defined, comprehends Polycheles, Pentacheles, and 
Stereomastis of Bate. 
