H. Doc. 129. 19 



Resembles N. alveata, Con., of the California Eocene. (See p. 10.) 



BULLA. 



53. B. JUGULARIS, Conrad, pi. vi, fig. 62, 62a, 62ft. Oblong elon- 

 gated, much contracted toward the apex; acutely rounded at the base. 



Locality. Ocoya creek. W. P. Blake. 



PLEUROTOMA. 



54. P. TRAXSMONTANA, Conrad, pi. vi, fig. 69. Fusiform, with ru- 

 gose revolving lines and distant short longitudinal undulations on the 

 body whorl ; volutions of the spire rounded; longitudinally undulated. 



Locality. Ocoya creek. W. P. Blake. 



55. P. OCOYANA, Conrad, pi. vi, fig. 71. Short fusiform body, 

 whorl ventricose, contracted near the suture, surface marked with re- 

 volving lines and numerous longitudinal furrows. 



Locality. Ocoya creek. W. P. Blake. 



SYCOTOPUS. 



56. s. OCOYANUS, Conrad, pi. vi, fig. 72. Spire depressed; whorls 

 flattened above ; shoulder sub-angulated, sides somewhat flattened, 

 columella profoundly rounded above and concave below. 



Locality. Ocoya creek. W. P. Blake. 



TURRITELLA. 



57. T. OCOYANA, Conrad, pi. vii, figs. 73, 73a, 73ft. Volutions 13 

 or 14, straight at the sides, rounded at base, and having well marked 

 revolving lines, base broad; volutions suddenly tapering to the apex. 



Locality. Ocoya creek. W. P. Blake. 



COLUS. 



58. c. ARCTATUS, Conrad, pi. vii, fig. 76. Narrow fusiform whorls 

 rounded ; beak very slender, somewhat sinuous. 



Locality. Ocoya creek, Cal. W. P. Blake. 



TELLINA. 



59. T. OCOYANA, Conrad, pi. vii, fig. 75. Elliptical compressed in- 

 equilateral ; posterior extremity acutely rounded, much above the line 

 of the base ; anterior end somewhat acutely rounded ; cardinal teeth 

 robust. 



PECTEN. 



60. p. NEVADANTJS, Conrad, pi. vii, fig. 77. Ovate, flat or slightly 

 concave; ribs 17? large, flattened on the back; interstices strongly 

 wrinkled transversely. 



This shell is so much nearly allied to N. Humphreysii of Maryland, 

 that, taken in connexion with P. Catittifornis, pi. viii, it may be 

 regarded as a Miocene species. The strata in which they occur maj 

 safely be referred to that period. 



Locality. Ocoya creek. W. P. Blake. 



