ri05) Galveston Well Fossils 23 



Cerithium sp. a. PI. 4, fig's 10, a. 



Fragments distinguished from the preceding species by their 

 more slender form, finer ribs, alternate and even striation, and 

 lack of granulation. It will be observed also that in this species 

 the ribs are prominent only above the middle of each whorl. 



Range in depth- From 2,236 to 2,871 feet. 



Cerithium sp. fi. PI. 4, fig. n. 



Fragments resembling galvestonense in size and number of ribs 

 but without a carination and granulations ; basal stria of each 

 whorl noticeabl)' larger than the others. 



Range in depth. — From 2,236 to 2,920 feet. 



Cei'ithiiims^. y. PI. 4, fig. 12. 



Fragments distinguished from the above by the gentle sloping 

 humerel band, the non-alternate spiral striation, and the large spi- 

 ral line just below the suture. 



Range in depth. - From 2,465 to 2,871 feet. 



MODULUS. 



Hlodiilns modidnsf Lin. 



Small, imperfect specimens from depths of 2,552 and 2.871 feet. 



TURRITELLA. 



Turritella subgrundifera Dall, var. 



The variety from the well inclines somewhat towards tiginna 

 Kiener, now living on the western coast of Mexico , for the basal 

 carina is not quite so prominent and the spiral striae not so limit- 

 ed in number nor so even in size as in the typical form. Again, 

 fragments indicate that this variety sometimes attains a consider- 

 ably^ larger size than the type form. 



Range in depth. — From 2,552 to 2,920 feet. 



SOLARIUM. 



Solarium pranulatum. 



