Cope. J 1<U I Aug. 17 



On some new or little known Reptiles and Fishes of the Cretaceous No. '6, 



of Kansas. 



Bx E. D. Cope. 

 \ 



(Read before the American Philosophical Society, August 17, 1877.) 



TOXOCHELYS LATIREMIS Cope. 



Final Report U. S. Geol. Surv. Terrs. II. pp. 98, 299. 



Two nearly complete crania of this species found by Mr. Sternberg, en- 

 able me to give the genus a definite position in the system. 



The prefrontals have an extensive mutual contact, and extend to the ex- 

 ternal nares, where they are somewhat contracted by the superior pro- 

 cesses of the maxillary. They descend to the vomer, and are extensively 

 in contact with it. There are no distinct nasal bones. Lachrymal foramen 

 rather small. The temporal fossa is extensively roofed, and the supraoccip- 

 ital crest much produced backwards. 



The posterior nares are rather anterior, and are separated, and not 

 underroofed by the osseous vomer. This element expands in front of the 

 nares, where it sepai-ates the maxillaries. 



A foramen separates the maxillaries from the palatines, and the ectop- 

 terygoids expand laterally. The superior alveolar surface is wide, and 

 slightly concave. The external border is elevated and acute, and the inner 

 border is slightly prominent and is roughened. 



The characters above adduced show that the genus Toxochelys is one of 

 the Gryptodira, and that it is distinct from Euelastcs (Cope) of the creta- 

 ceous No. 5. In that genus the posterior nares are underrun by a produc- 

 tion of the vomer, and the alveolar faces of both jaws are much wider. 

 The general form of the skull of Toxochelys is much like that of many 

 Trionyehidm, but from these the characters of the marginal bones of the 

 carapace, and the form of the extremities separate it. 



ICHTHYODECTES GOODEANUS Sp. nOV. 



This largest species of the genus is represented by a right premaxillary 

 and a large part of the maxillary bones. The alveolar border is concave 

 at the anterior part of the latter, and then becomes convex. The maxil- 

 lary border is incurved at its anterior extremity, so that the line of teeth is 

 turned inwards as well as strongly upwards, the middle part of the border 

 being the most prominent. In this respect it differs from the other species, 

 where the anterior part of the alveolar border is the most prominent. The 

 anterior border is sigmoidally curved, and the vertical diameter is twice 

 the transverse. The premaxillary teeth number thirteen and are somewhat 

 compressed so as to have opposed cutting edges ; they are without grooves 

 or ridges. The maxillary teeth are round in section. The posterior maxil- 

 lary condyle is not protuberant, and is decurved anteriorly. The maxil- ' 

 lary underlaps the premaxillary to near its anterior border. 



