150 PALAEONTOLOGY OF CALIFORNIA. 



positive were it not that he holds the same opinion about several other species, and 

 it is not probable that a single boulder should have contained several species, 

 never afterwards encountered by Professor Brewer on his visit, by me on the three 

 or four occasions when I have been there, or by Dr. Horn, who collected there 

 assiduously for a number of months I 



Mr. Conrad, in the Smithsonian Check List, mentions a P. Gabbii, Con. No 

 such species has ever been described ; can this be the shell ? Mr. C. says he does 

 not remember, and I have no other clue. 



SURCULA, H. & A. Ad. 



S. PILEATTENUATA, 11. S. 

 PI. 26, Fig. 27. 



Shell very long and slender; spire unusually high; whorls 

 angulated, numerous (perhaps ten or more). Surface marked by 

 a row of small nodes on the angle of the whorls, and by numer- 

 ous small revolving ribs, crossed by irregular lines of growth, the 

 latter, at times, elevated, so as to form imperfect longitudinal ribs. 

 Aperture short, as compared with the height of the spire ; outer 

 lip broadly and shallowly emarginate above the angle of the 

 whorl, produced and regularly convex below. 



Length, 2.5 inch (about); length of aperture, 1 inch; length of body whorl, .7 

 inch. 



From the Tejon Group, San Diego ; Dr. Cooper. 



This species can be at once distinguished by its extremely elongate form, and 

 the comparatively short aperture. As is usually the case with very slender fossil 

 shells, it is nearly impossible to obtain an entire specimen, and I have never been 

 able to see the whole spire. From the rate of diminution in size of the whorls 

 towards the apex, I believe the species to have had at least ten, and perhaps one 

 or two more volutions. 



S. (Surculites) sinuata,' Gabb. 



PI. 26, Fig. 28. 

 (Conus sinuatus, Gabb; Pal. Cal., Vol. 1, p. 123, pi. 29, fig. 227.) 



Shell broadly fusiform, spire shorter than the aperture, tur- 

 reted ; whorls about six to six and a half, angulated, concave 



