148 University of California Publications in Geology [Vol. 8 



Its very graceful, long, turreted spire is its distinguishing feature. 

 Named in honor of Professor G. D. Louderhack, University of 

 California. 



SURCULA MERRIAMI, n. sp. 

 Plate 16, figure 10 



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

 nodose whorls ; suture line prominent and just below 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 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 indicating the position of the 

 sinus. The canal is broken but the upper portion suggests that it is 

 a long one. 



Dimensions. — Length of broken specimen, 21 mm. ; width of body 

 whorl, 13 mm. 



Occurrence. — University of California localities 1556 and 1558. 

 The strong spiral lines on the nodes are the distinctive features of 

 this shell. Two specimens have been found. 

 Named in honor of Professor J. C. Merriam. 



SURCULA FA1RBANKSI, n. sp. 

 Plate 16, figure 12 



Shell spindle-shaped, slender with eight whorls, nodose, convex and 

 angulated in middle ; suture well marked and deep. About ten nodes 

 ornament each whorl. They extend to the suture. The whorls are 

 but slightly swollen. The portion of the whorl between the shoulder 

 and the surface is flat and the lines of growth of this area are curved 

 with the apex of the curve near the suture, indicating that the sinus 

 is above the shoulder of the whorl. The inner lip appears to be 

 slightly incrusted. 



Dimensions. — Length, 45 mm. ; width of body whorl, 20 mm. 



Occurrence. — University of California Locality 1540. 



At first sight this shell looks like Pleurotoma fresnoensis Arnold, 

 but it is much larger, the number of whorls is only eight instead of 



