OF CONCriOLOOY. 89 



In the upper member are found the following Cephalapo- 

 dee: — 



Nautilus, apparently Texanus, Shum. The same species, 

 whether Texanus or not, is not rare in tbe older group, in the 

 Northern part of the State, associated with over a dozen spe- 

 cies of Ammonites. 



Aturla Mathewsonli, G., claimed by Mr. Conrad as A.zic-zic 

 or A. angustata, has been found at Tejon* and Clayton in Di- 

 vision B ; but the specimen from which my drawing was 

 taken, and by means of which Mr. Conrad recognizes a Ter- 

 tiary fossil, was found by Mr. Mathewson and myself in the 

 older member, associated with Turritella Safford;i, Venus va- 

 rians, Pugnellus hamulus, and other equally characteristic 

 species of that group! 



Ammonites, n. s., referred incorrectly to A. Newberryanus 

 (Report, pi. 10, fig. 5), also found abundantly at Martinez in 

 Division A. Several specimens were collected by myself, as- 

 sociated, in the same rock, and within a few feet of a specimen 

 of Cardita Hornii, G., (C. jjlanicosta, var. regia of Conrad. 



t Ammonites Cooperii, G. One of the Ammonitidse, whether 

 an Ammonite or not, is from the presumed Eocene of Mr. Con- 

 rad, from San Diego, and the family is sufficient to establish 

 the age of that deposit, had we no other proof. 



Fusus Californicus, Con. sp. Mr. Conrad is mistaken in 

 supposing that my specimens do not come from his typical lo- 

 cality. His figure (Pacific R. R. Rep., Vol. V., pi. 2, fig. 11,) 

 is apparently taken from an internal cast, corresponding ex- 

 actly with many found at Clayton and Tejon. I have speci- 

 mens from both localities. There is no other shell, yet found 

 by myself or any of my friends, that will correspond with his 

 figure ; and, so far as his description goes, it agrees perfectlv 

 with my species. I quote it at length: — "Fusiform; spire 

 conical, volutions rounded, somewhat flattened above; (it must 

 be remembered that this is in the cast) body whorl ventricose. 

 beak short and narrow." 



Volutilithes Navarroensis, Shum. As I understand the genus 

 Rostellites, Con., one important character is the existence of ;i 

 large number of small folds on the columellar lip. Our spe- 

 cies has but three. It cannot be the same asi?. Texanus, Con., 

 which, as figured by Mr. Conrad, has at least eight folds ; and 

 the character of the spire is sufficiently different to separate it. 



* I might here remark, that I use the local name " Tejon " to designate 

 a stretch of country about four or five miles long, including the north end 

 of the Canada or " Cajon " de las Uvas and Alizos Creek, containing a 

 continuous deposit of the rocks in question. It was from this place that 

 Mr. Conrad oblained the boulder, containing the originals of his paper in 

 the "Pacific Railroad Report." 



