call] 



NOTKS ON SOME: UPPER CRETACEOUS VOLUTID.E 



17 



to the swollen fasciole by the posterior sinus, the whole with faint 

 sparse spiral threads with slightly wider interspaces ; posterior sinus 

 strong, short, not deep ; whole shell with a thick coat of enamel, and 

 about six whorls, anterior portion defective in all the specimens. 

 L,on. of spire above the posterior sinus 48, diameter about 45 mm. 



Ripley formation of Upper Cretaceous at Bullock's Mill, near 

 Dumas, and Mount Olivet Church, Union county, Miss. (20,503 and 

 20,576 in part, U. S. Nat. Mus.). 



Although imperfect, the form and sculpture indicate a distinct 

 species easily recognizable from the differential characters of the 

 diagnosis. The substance of the shell is soft and chalky. 



VOLUTOMORPHA ASPERA Dall, n. sp. 

 (Figure 5) 



Fig. 5.— /". aspera Dall. 1/1. Ripley, Fig. 6.— V.turriatla Dall. 1/1. Upper 

 Miss. part of spire, showing sculpture and 



form. Bullock's Mill, near Dumas, 

 Miss. 



Shell considerably crushed and wanting the earlier whorls, but 

 showing one well-marked plait ; the last whorl with about thirteen 

 narrow ribs, obsolete in front of the suture, prominent at the shoul- 

 der, weaker over the body; the whorl between suture and shoulder 

 constricted and more or less axially wrinkled ; posterior sinus at the 

 appressed suture ; the sinus is narrow and shallow ; spiral sculpture 



