NO. 1699. ON EDE8TV8 AND RELATED GENERA— HAY. 61 



EXPLANATION OF PLATES. 

 Plate 12. 



Figs. 1-3. Eclestus crenulatus, Xf. 

 Fig. 1. View of right side. 



2. View of section at tlie fracture tliroiigli tlie second tootli from tlie 



riglit. 



3. View of section at tlie fracture tlirougli tlie fourtli tooth from right. 



4. Edcstus scrratus, Xt- View of right side. 



In Figs. 2, 3, the narrow white lines are at the boundaries between the con- 

 tiguous sheaths. 



Plate 13. 



Figs. 1, 2. Edestus hcinrichii, X G. 



Fig. 1. Cross-section through shaft and front of tooth. 



2. Vertical sagittal section of shaft and part of tooth. 



In both of the figures the vascular channels are represented in black. 



3. Edestus hcinrichii, X45. 



Part of sagittal section through tooth to show vascular canals and 

 the dentinal canals diverging from them. 

 4,5. Ctcnacanthiis varians, X6. Cat. No. 604S, U.S.N.M. 



4. Transverse section. The vascular canals are black. 



5. Longitudinal section. 



Plate 14. 



Lissoprion fcrricri, Xts. 



Fig. 1. Part of the outer whorl, with 7 large teeth, and some small teeth of 

 an inner whorl. 

 2. The axis and about 12 teeth of another specimen. 



Plate 15. 



EissoiJiion ferrieri, Xiu. View of spiral showing the whorls and some of the 

 teeth. 



