326 G. B. Wieland — On Marine Turtles. 



cles really represent a disappearing series of dermal elements 

 is further strengthened by the writer's observation that inter- 

 polated ossicles also occur in the marginal series of occasional 

 specimens of Lytoloma angusta, as will be further considered 

 below. 



Despite the frequent occurrence of Toxochelyds in the 

 Niobrara, until now no complete carapace has been described. 

 It is, therefore, of timely interest that a specimen collected by 

 Mr. Charles H. Sternberg in Gove County, Kansas, and very 

 recently acquired by the Yale Museum, includes a carapace 

 and plastron sufficiently complete to determine accurately all 

 the details of shell structure and form. The original locality, 

 according to Mr. Sternberg, is in a ravine about three miles 

 north of Monument Rocks, and about four miles east of the 

 western Gove County line. This fossil is numbered 2823 in 

 the Yale Museum accession list, and on the basis of the analy- 

 sis given below is referred to the new species Toxochelys 

 Bauri. in honor of that distinguished student of the Testudi- 

 nata the late lamented Professor Georg Baur. As shown on 

 Plate X, T. Bauri, represents one of the most ornate of all 

 extinct Testudinate species. The type consists in the follow- 

 ing elements : — 



The nuchal and eight closely articulated neuralia with the 

 ninth median or post-neural element bipartite, and followed 

 by an antero-pygal and the pygal marginal (the postero-pygal 

 being the only median element absent) ; three epi-neural ossi- 

 cles respectively seated on the 3d and 4th, the 5th and 6th, 

 and the 8th-1.0th members of the neural series ; the lst-3d, 

 and the 8th-llth right marginals ; the 4th-6th, 8th and 10th 

 left marginals ; most of the pleuralia ; also the right hyo- and 

 hypoplastron nearly complete, and various fragments of verte- 

 brae with several centra and arches. Of the right pleuralia 

 the first and seventh are complete, and the third, fourth and 

 sixth only lack rib-tips, while the expanded plates of all the 

 right pleurals but the distal portion of the fifth, are fortunately 

 present. On the left side the pleurals are not so complete, 

 only the proximal ends having been recovered, with the excep- 

 tion of the third, which only lacks a middle portion of the 

 plate. Cf. figure 6. 



The hyo- and hypoplastron lack their interior digitations, 

 but fortunately permit an approximate restoration from what 

 is known of the plastron of several other species (cf. figure 7). 

 The fragmentary or not directly determinable skeletal parts 

 include two dorsal centra, 4 cm in length, and several caudal 

 centra, with a few portions of cervicals. 



With the exception of some of the middle and anterior 

 marginals, which are curiously crushed from very different 



