1914] Dickerson: Fauna of the Martinez Eocene of Calif ornia 149 



ten of the P. fresnoensis, and its apical angle is decidedly greater. 

 The nodes of this shell are not so pointed as those of 8. crenatospira 

 Cooper. The portion of the whorl between the shoulder and the 

 suture in 8. crenatospira is curved. 



Named in honor of Dr. H. W. Fairbanks. 



SURCULA (SURCULITES) ANDERSONI, n. sp. 

 Plate 16, figure 11 



Shell very long, slender; spire high about two-fifths of length ;-nine 

 or ten whorls, nodose, angulated, with sinus slightly above angle judg- 

 ing from growth lines ; twelve or thirteen elongate rounded nodes mark 

 each whorl. The body whorl is distinctly marked by revolving lines 

 which alternate in size. A very distinct collar appears just below the 

 channeled suture of each whorl. 



Dimensions. — Length of broken specimen, 40 mm. ; width of body 

 whorl, 12 mm. 



Occurrence. — The type specimen was found at University of Cali- 

 fornia Locality 243, Trochocyathus zitteli zone of type locality. It 

 also occurs at Selby Smelter on the Carquinez Straits. 



Surcula (SurcuUtes) praeattenuata Gabb of the Tejon resembles 

 this species closely, but its body whorl is decidedly shorter in propor- 

 tion to length. 



Named in honor of Mr. F. M. Anderson, Curator of Invertebrate 

 Palaeontology, California Academy of Sciences, San Francisco. 



SURCULA, sp. 

 Plate 16, figures 13a, 136 

 Shell fusiform, with moderately high spire, with seven or more 

 nodose whorls ; suture line prominent and just beneath the nodes. 

 About fourteen nodes ornament the body whorl, while only ten are 

 found on the fourth whorl. The nodes are acute, and strong spiral 

 lines of growth mark them. The nodes on the body whorl are much 

 longer than those on the upper whorls. The portion of the whorl 

 between the shoulder and the suture is concave, with the center of 

 the concavity two-thirds of the total distance above the nodes. This 

 surface is marked by the curved lines of growth of the sinus and the 

 apex of the curve is two-thirds the distance above the nodes, thus 



