270 



aaa. Species known only from teeth and parts of crania : 

 Mosasaurus acutidens, Gibbes. 



Holcodus acutidens, Gibbes, pro parte, Smithsonian Contributions, II, p. 9, Plate III, figs. 6-9. 



? Mosasaurus minor, Gibbes, 1. c, p. 7, Plato I, figs. 3-5, 1851. 



Cretaceous of Alabama. 

 Mosasaurus copeanus, Marsh. 



American Journal of Science and Arts, 1869, 398 ; Cope, Extinct Batracbia and Reptilia of 

 North America, 1870, p. 198. 



Greensand, No. 4, New Jersey. 

 Mosasaurus crassidens, Marsh. 



American Journal of Science and Arts, 1870, February and March ; Cope, Extinct Batracbia 

 and Reptilia of North America, 1870, 198. 



Greensand of North Carolina. 

 aaaa. Species of uncertain reference : 

 Mosasaurus miersii, Marsh. 



American Journal of Science and Arts, 1869, 395. 



Greensand below No. 5, New Jersey. 

 Mosasaurus brumbyi, Gibbes. 



Cope, Extinct Batracbia and Reptilia of North America, 1870, p. 198. — Amphorosteus Brunibgl, 

 Gibbes, Smithsonian Contributions, II, 1851, p. 9, Plate III, figs. 10-16. 



Cretaceous of Alabama. 



LlODON, Owen. 



Proceedings of the British Association for the Advancement of Science, 1841, p. Ill ; Cope, Transactions 

 of tho American Philosophical Society, Extinct Batracbia, etc., 1870, p. 200 ; Proceedings of the 

 American Philosophical Society. 1871, December. 



a. Species with the dorsal vertebral centra compressed; Macrosaurus, 

 Owen : 



LlODON LiEVIS, Owen. 



Macrosaurus laivis, Owen, Journal of the Geological Society of London, 1849, 380, plate. — 

 Liodon tori's, Cope, Extinct Batracbia and Reptilia of North America, 1870, 205 

 (exclusive of Lockwood's specimen). 



Greensand, No. ; . New Jersey. 



LlODON MITCITILLII, DcKilV. 



Geosaitrus mikhillii, DoKay, Annals of the Lyceum of New York, III, p. 140. — Mosasaurus 

 mitchillii, pro parte, Leidy, Cretaceous Reptiles of tho United States, p. Go, Plato XI, 

 tigs. 1-4 ; Cope, Proceedings of the Boston Society of Natural History, 1869.— lircpa- 

 nodon impar, Leidy, Proceedings of the Academy of Philadelphia, 1856,255 —LcsUeo- 

 dus impar, Leidy, Geological Survey of North Carolina, p. 224, figs. 45-46, fide Leidy. 



This species is at least twice as large as the L. hecis, equaling the largest 

 of (he order. Much of the cranium remains unknown, but isolated teeth are 



