A front paddle preserved in the Yale collection, has, as usual, the humerus more expanded distally. An outline of the coracoids and scapulæ, as preserved, is given in text-figure 5.
Polycotylus dolichopus n. sp. Niobrara Cretaceous of Kansas.
A species quite distinct from P. latipinnis is represented in the Yale collection by two specimens, the one a femur and most of the paddle (No. 1642), the other a humerus and some
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of the mesopodial and epipodial bones (No. 1646), both from the Niobrara chalk of Kansas.
I am convinced that these two specimens are conspecific, judging especially from the shape of the epipodials, but in the possibility that they may prove to be distinct, specimen No. 1646 may be considered the type of the species. The species is especially characterized by the slenderness of the shaft of
