PLATE 68. 



Fig. 1-14. 503. 1. HoMALONOTUS DELPHINOCEPHALUS. { Pag. 309.) 



I, 2 8t 3. Individuals of different sizes, from the smallest yet seen. 



4. An individual of medium size, and remarkable for having the caudal e.\tremity obtuse. 



5. A large individual of this species, where the caudal extremity is very acute. 



6. A small specimen rolled up. This position is very rare for this species, though quite common in the H. 



dckayii. 



7. 8 & 9. The head and caudal shields as they occur separately in the rock. 



10. The head of a l.irge individual, witli a part of the glabella broken up, .ind which has carried wilh il the 

 hypostoma or clypcus, the iniiiressioii of which is still visible. 



II. The lower side of this separated fragment, showing the clypeus. 



12. A lateral view of several of the articulations of the body, as shown when the individual is bent a little 



downwards in the middle. 



13. Several articulations still more expanded, showing their entire form. 



1-i. A portion of the surface from the caudal extremity enlarged, showing the characteristic little papulous 

 elevations. 



