34 H. Doc. 129. 



suddenly near the top, and the folds of the enamel on the inner side 

 of the tooth are coarser. The base of the tooth is more compressed 

 than in L. elegans, in which respect the tooth resembles more L. 

 acuminata. 



The small tooth found with the specimen may be one of the lateral 

 teeth of the same species; but it is difficult to determine this without 

 a microscopical examination of its structure. These fossils are un- 

 questionably of tertiary age. L. elegans is found in the Calcaire 

 grossier in the environs of Paris, and in the London clay at Sheppy. 

 The same species is also found fossil in the Crag, having been trans- 

 ported with the remains of many other species from the London clay. 

 Several species of this genus have been described from the Atlantic 

 States by Dr. R. W. Gibbes. 



ZYGOBATES, Jgass. 



11. z. ? A fragment of a tooth of the genus zygobates is 



interesting inasmuch as it shows that this genus of the order of the 

 family of skates, with pavement-like teeth, to have occurred in Cali- 

 fornia during the tertiary period ; though the fragment of the tooth 

 before me is too imperfect to allow the species to be identified. It 

 may not be out of place to remark that no species of this genus, or 

 the allied genera Einoptera, .ZEtobates, or Myliobates have thus far 

 been found in the Pacific ocean. 



Several fragments of bone found with the teeth at Ocoya creek 

 (Pose creek) belong to the family of Scomberoides, but are too imper- 

 fect to admit of beinsr identified. 



