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University of California Publications in Geology [Vol. 9 



MUREX PERANGULATUS, n. sp. 

 Plate 11, figures la, lb 

 Shell heavy, six or seven whorls, with three prominent thick varices 

 which are continuous from body whorl up the spire. Spire low with 

 indistinct slightly appressed suture. Spiral sculpture consisting of ( on 

 the body whorl seven and on the others two) prominent somewhat 

 nodose ribs, on last whorl an intercalary occurs between each pair. 

 Canal open, straight. Outer lip slightly thickened, margin sharp, 

 internal spiral lines continue to edge, anterior part projects about 



5 mm. in front of columella. Inner lip smooth, columella imperforate. 

 Dimensions of type : height, 45 mm. ; width, 27 mm. 



This species resembles somewhat Purpura foliata Martyn, but dif- 

 fers in having apparently no anterior tooth or spine characteristic of 

 that genus, open canal, a low spire, and a projecting and not as much 

 thickened outer lip. 



Occurrence. — University of California locality 2649, on ridge above 

 Coalinga-Priest Valley road, SE y 4 sec. 19, T. 21 S, R. 14 E, M. D. B. 



6 M. 



MYTILUS KEWI, n. sp. 

 Plate 9, figure 1 



Shell elongate ovate, of moderate thickness. Surface sculptured 

 by numerous unequal incremental lines and minute radiating striae. 

 A wide depressed area passes from slightly above the beak to about 

 middle of base. Beak terminal, somewhat curved. Posterior end 

 regularly rounded. Posterior dorsal margin slightly arcuate, with 

 small angulation a little more than one-half of the distance from the 

 beaks to the anterior end. Base straight except slight arch where it 

 meets the depressed area. Dimensions of type, which is a small speci- 

 men : length, 86 mm. ; height, 45 mm. ; maximum diameter, 34 mm. 



This species seems to be rather closely allied to Myiilus expansus 

 Arnold, which occurs in the lower Miocene. M. expansus Arnold has, 

 however, a broader posterior outline and the depressed area is not as 

 well marked. M. hewi, n. sp., differs from M. coalingensis Arnold, 

 which also occurs in the Jacalitos beds, by being smaller, having less 

 acute and not as much thickened beak, and in the depression extending 

 from beak to basal margin. 



Occurrence. — University of California locality 2680, near top of 

 ridge at center of NW V 4 sec. 8, T. 22 S, R. 15 E, M. D. B. & M. 



