CRETACEOUS FOSSILS. 149 



all peculiar to the older divisions of our California Cretaceous, and two out of the 

 three species are represented by but few specimens, and are confined to single 

 localities. 



E. PONDEROSA, Gabb. 



(Ncptunea ponderosa, Gabb; Pal. Cal., Vol. 1, p. 88, pi. 18, fig. 38.) 



The most common of the three species, numerous specimens having been ob 

 tained at Tuscan, or Lick Springs, by Dr. Veatch. It has also been found at 

 Pence's Kanch, Butte County. 



E. PERFORATA, Gabb. 



(Neptunea perforata, Gabb ; Pal. Cal., Vol. l,p. 89, pi. 18, fig. 39.) 



Referred by error to page 81 on the index to the plate. 



Not rare at Cottonwood Creek, Shasta Group ; unknown elsewhere. 



A small shell, half an inch long. 



E. HOFFMANNII, Gabb. 



(Neptunea Hoffmannii, Gabb ; Pal. Cal., Vol. 1, p. 90, pi. 18, fig. 41.) 

 Found with the preceding. Rare. 



? NEPTUNEA GRACILIS, Gabb. 



This shell, and ? N. supraplicata, were referred to Neptunea, because they agree 

 with that genus, more than with any other. They however possess some charac 

 ters which render this reference doubtful, and more perfect material than has yet 

 been obtained will perhaps warrant their separation. 



PERISSOLAX, Gabb. 

 P. BLAKEI, Con. Sp. 



(Busycon ? Blakei, Con. ; P. R. R. Rep., Vol. 5, p. 322, pi. 2, fig. 13.) 

 (P. Blakei, Gabb ; Pal. Cal., Vol. 1, p. 92, pi. 21, fig. 110.) 



A specimen before me, of this shell, from Martinez, has three distinct revolving 

 angles on the body whorl, instead of the two on the specimen figured as above, 

 and the spire is not so high. Mr. Conrad denies my determination of the species, 

 saying that his Busycon Blakei is very different. I cannot agree with him, and am 

 perfectly satisfied that this is the shell described by him from Tejon, where it is 

 very abundant, and where no similar shell has ever been found. I would be less 



