PLATE 5. 



Athleta lugardi, sp. nov. 



FIG. I. An adult example showing the long, narrow aperture with the marginally thin 

 labrum, the prominent rounded posterior callosity, and the twisted " bourrelet " 

 at the base. 



FIG. 2. Summit view of the volutions of the same specimen showing periodical growth 



ridges. 

 FIG. 3. An apertural view of a smaller specimen with a less depressed spire. 



Turritella mauryana, sp. nov. 

 FlG. 4. View showing sub-quadrangular aperture, and the sub-horizontal shelf-like 



structure of the volutions. 



FIG. 5. The earlier part of the spire of another specimen. 

 FIG. 6. Fragment of an adult form showing the well excavated striations between the 



suture and peripheral carination. 



Turritella cf. sulcifera, Deshayes. 

 FIG. 7. A profile view of example showing the closely spiral sculpture. 



Exechestoma cossmanni, sp. nov. 

 FlG. 8. Dorsal aspect of example in which the upper part of the spire is absent, showing 



the equidistant tubercles and the pair of spiral ridges at the base. 

 FlG. 9. Ventral aspect of a smaller specimen showing the sub-quadrangular aperture. 



Stellaxis bicingulata, sp. nov. 

 FIG. 10. Spiral view of example. 



FIG. 1 1 . Base of another specimen showing marginal tubercles to the whorls in the 

 umbilical cavity and the bicingulation near the margin. 



Solariaxis cf. spectabilis (J. de C. Sowerby). 



FlG. 12. Spiral view exhibiting close concentric striations bearing minute tubercles. 

 FlG. 13. The base of another specimen with deep umbilical cavity and marginal 

 tubercles to the whorls. 



Bonellitia cf. evulsa (Solander). 



FlG. 14. Ventral view showing aperture and the triplicate columella. 

 FlG. 15. Dorsal view of another example showing the elevated plications. 



Neverita cf. calvimontana (Deshayes). 

 FlG. 1 6. Dorsal view showing depressed spiral region, with minutely canaliculated 



suture, and extensive body whorl. 

 FlG. 17. A younger specimen exhibiting the semilunate aperture, with a prominent 



funiculate callosity occupying the umbilicus. 



Trigonostoma decorata, sp. nov. 

 FIG. 1 8. Apertural view showing spinose sutural margins and the interno-marginal 



ridges of the labrum. x 2. 

 FlG. 19. Dorso-lateral view of another example showing the sutural sulcation furnished 



with radial ridges, x 2. 



