362 NEW YORK STATE MUSEUM 
the Buffalo Society of Natural Sciences and its posterior portion is 
here reproduced in text figure 76. Closer study of this indicates that 
again an ultimate abdominal segment has been mistaken for a telson, 
as the fact of its equal width with the preceding segments readily shows. 
The misleading bilobed aspect is produced by a strong development 
of the median dorsal keel which appears in this cast as a deep cleft. In 
the true British bilobus the telson is nearly twice as long as the ulti- 
mate postabdominal segment. 
As it would be fatuous to base a species on the manducatory edge 
of a coxa or even the whole coxa itself,! Grote and Pitt’s term cum- 
mingsi is here rejected. This is the more necessary, as these authors 
afterward referred to their species the free ramus of a chelicera which 
is clearly identical with P. cobbi Hall. 
Pohlman’s P. buffaloensis, acuticaudatus, quad- 
raticaudatus, macrophthalmus (?) and bilobus all 
belong to one species. We adopt the first name here used, P. buffalo- 
ensis, emending the species by a fuller description. 
Description. Body slender, lanceolate in outline, five times as long 
as wide. 
Cephalothorax. The carapace in mature specimens is trapezoidal, 
the lateral margins subparallel, slightly convex or angular, forming an 
obtuse angle with the slightly convex anterior margin. The posterior 
edge is broadly concave. The surface seems to have been uniformly 
convex. The compound eyes form the antelateral angles of the carapace, 
are subelliptic in outline and equal about one half the length of the 
carapace in younger and four ninths in the largest individuals. 
The ocelli and the doublure are as in P. macrophthalmus. 
Abdomen. The abdomen does not differ in either its proportions 
or characters from that of P. macrophthalmus. The operculum 
which is not well known in the latter, is here well exposed in several speci- 
1 Although Grote and Pitt figured only the former, nearly the whole coxa is pre- 
served in fainter outline [plate 79, fig. 1]. 
