Geology. ‘ aT5 
Several teeth of a very interesting species of Oxyrhina are found 
lengths of their curves. The specimens agreeing in this character differ 
greatly in size, and yet not more so than may be seen in the same jaw 
of our living species. 
Found with the preceding by Mr. Blake. wd 
9.) Lamna clavata, Agas.—Two teeth from Ocoya creek indicate 
the latter. The posterior surface is smooth as in L. cuspidata, 
Found with the preceding in the tertiary formation of Ocoya creek. 
(10.) LZ. ornata, Agas.—A second species of Lamna has been brought 
microscopical examination of its structure. ese fossils are un- 
questionably of tertiary age. JL. 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, ape, be transported with 
the remains of many other species from don clay. Several 
hg <4 this genus have been described from the Atlantic States by 
» h. W, Gibbes, A, ike 
(11.) Zygobates, >—A fragment of a tooth of the genus Zygo- 
bates 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 
California 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 
Benera Rhinoptera, Atobates, or Myliobates have thus far been found in 
the Pacific ocean. eee 
Several fragments of bone found with the teeth at Oce 
sigs creek) belong to the family of Scomberoides, but are 
+t to admit of being identified. 
