1913] Dicker son: Fauna of Eocene at Marysville Buttes 281 



Cooper described this species from a single specimen im- 

 bedded in rock and hence a portion of the specimen was not 

 visible. The "wide interval" between the revolving rib near the 

 suture and the rib at angle is marked on the body whorl by five 

 riblets which alternate in size, and two or three on the penulti- 

 mate whorl. A persistent minor riblet can be seen between the 

 other revolving ribs. On the body-whorl 12 or 13 revolving ribs 

 alternating with minor riblets are found. The vertical ribs on 

 the body-whorl extend nearly the length of this whorl excepting 

 on the columella where they extend only a third to a half of the 

 length. The columella is marked by six plaits which increase 

 regularly in strength, the uppermost being the strongest. Colum- 

 ella slightly incrusted. Four or five nearly perfect specimens 

 were found at University of California Locality 1853. 



Dimensions : Length, 10mm ; width of body- whorl, 3mm. 



FUSINUS (PRISCOFUSUS) LINEATUS, n.sp. 

 Plate 11, figure 12 



Shell, small, spindle shaped, eight whorls. The first three 

 minute, rounded, smooth ; the remaining whorls rounded and 

 marked by equal, flattened ribs with interspaces half as wide as 

 the ribs. The number of the ribs on fourth whorl is four, five 

 on fifth and sixth and about fifteen on the body-whorl. The 

 body-whorl is somewhat longer than the spire. Mouth, long, 

 slightly widened posteriorly and narrowed anteriorly into a short 

 canal. Inner lip slightly incrusted. 



University of California Locality 1853. 



Dimensions: Length 6mm; width of body-whorl, 2mm. 



TEEEBRA WATTSIANA Cooper 

 Plate 11, figure 10 



Terebra wattsiana Cooper. — Cooper, J. G., Catalogue of California 

 Fossils, Bull. 4, California State Mining Bureau, p. 39. 1894. 



"Whorls regularly tapering, about fourteen (upper three or four lost); 

 flattened, slightly turreted by narrowing in front, the highest with about 

 twenty-three narrow, close-set riblets crossing their whole width ver- 

 tically, and increasing to about fifty on body-whorl. Base and columella 

 smooth, mouth normal, canal much twisted, not deep. Length, about 

 1.75 inch; breadth, 0.45; mouth, 0.4; width, 0.10. More robust, larger, 

 and fewer-whorled than T. califomica Gabb, also of Div. B, but nearly 

 allied to that species. A single specimen only was found at Marysville 

 Buttes by Mr. W. L. Watts." 



