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University of California Publications in Geology [Vol. 9 



appearance. Each whorl ornamented by nine or ten prominent varices, 

 which at angles of whorl produce nodes or short spines which become 

 stronger with age. Immediately under body whorl is a deep groove 

 or canal, in front of which the anterior portion of whorl protrudes. 

 Aperture large, angular, with simple outer lip. Canal long, recurved. 

 Height of imperfect type, 92 mm. ; diameter, 70 mm. 



This species has heretofore been identified as Trophon ponderosum 

 Gabb. From this it differs by much larger size, stronger angulation 

 at base of body whorl, longer canal, and in having the deep groove at 

 base of last whorl. Trophon carisaensis P. M. Anderson is apparently 

 a close relative of this form, but differs from Trophon magister, n. sp., 

 in smaller size, more prominent upper and less prominent lower nodes 

 on body whorl, suture being higher up on posterior whorls, and the 

 smaller angle which the upper surface makes with the axis of shell. 



Occurrence. — Type from University of California locality 2098, 

 NW % see. 24, T. 21 S, R. 14 E, M. D. B. & M. This species occurs 

 commonly in the upper portion of the Jacalitos beds. 



TURKITELLA NOVA, n. sp. 

 Plate 11, figure 3 



Shell turreted, whorls flat, with well-defined depressed suture. 

 Between the two more prominent spiral ridges, but somewhat nearer 

 the upper is a narrow groove. Immediately above and also immedi- 

 ately below the suture is a low ridge. Between the low ridge above 

 the suture and the heavier of the two ridges near the middle of the 

 whorl is a wide groove, giving a distinctly excavated appearance to this 

 portion of the whorl. Diameter, 11 mm.; height unknown. 



This form is decidedly similar to Turritella cooperi Carpenter, of 

 which it is probably the precursor. It differs, however, in having the 

 narrow middle groove, the minor ridges near the suture, and the 

 excavated area at the lower part of the whorls. 



Occurrence. — Type from University of California locality 2533, 

 NE 14 sec. 2!), T. 21 S, R. 14 E, M. D. B. & M.. on west bank of 

 Waltham Canyon. 



Associated with this species are found in the type locality Macoma 

 vanvlecki Arnold, Pecten estrellanus Conrad var. terminus Arnold, 

 Pecten oweni Arnold, Cancellaria tritonidea Gabb, Ficus nodiferous 

 Gabb, Turris (Bathytoma) coalingensis Arnold, Thais kettlemanensis 

 Arnold, Turris (Bathytoma) tryoniana (Gabb). 



Transmitted October 1, 19J5. 



