146 BULI^KTIN 4 260 



Explanation of Plate 10. 



(20) 



Page. 

 Fig. I. Trophon morulus Con., X2 100, 314. 



2. Murex (^Pteronotus) matthewsensis Aid., X2... loi, 315. 



3. Triton {Ranularia) eocensis Aid., xi^ " " 



4. Triton {Simpulum) showalteri Con., xi^ 102, 316. 



5 . Pyrula juvenis Whitf " " 



6. Pyrula juvenis Whitf. , xij4, showing quadricarinate 



body whorl and typically crenulated shoulder. 



7. Calyptraphorus velatus var. compressus Aid 104, 318. 



Back view.* (Enlarged.) 



a. Front view.* " 



b. Side view.* " 



8. Labrum of the same species; showing acute posterior ter- 



mination. From a cast, i ^ mi. N. E. of Clayton. 



9. Aporrhais s^.,\ X2 105, 319. 



10. Cerithiuvt {Companile) claytonense Aid " " 



Showing internal plaits.* 



11. The same species; exterior view.* 



