104 PROCEEDINGS OF THE 



DESCRIPTION OF THE FIGURES.* 

 Plate I. 



Chiton Dalriensis, Etheridge, jun. 



Fig. 1. — Anterior plate of the full size. x 5. Collection. — J. 

 Bennie. 



Fig. 2. — Intermediate plate, largest observed, x 4. Collection. — 

 J. Smith. 



Fig. 3. — Side view of the same plate, x 4. 



Fig. 4. — A similar but smaller plate, with the apophyses in place, 

 x 4. Collection. — J. Smith. 



Fig. 5. — Side view of the same plate. x 4. 



Fig. 6. — Another form of intermediate plate, probably of this 

 species, in which the apex is much produced backwards, and the 

 ornament partially removed from the centre. x 4. Collection. — 

 J. Smith. 



Fig. 7. — A fourth form, with the granules similarly removed, and 

 the anterior concavity somewhat enlarged by reason of slight 

 fracture. x 4. Collection. — J. Smith. 



Fig. 8. — A very delicate and transversely elongated plate, also, 

 probably, of this species. x 4. Collection. — J. Smith. 



Fig. 9. — Normal form of posterior plate, with the apophyses 

 a little broken. x 7. Collection. — J. Bennie. 



Fig. 10. — Interior of posterior plate. x 6. 



Fig. 11. — A posterior plate more transversely elongated in pro- 

 portion to its length. x 6. Collection. — J. Bennie. 



Fig. 12. — Side view of the same, x 6. 



Fig. 13. — A posterior plate presumed to be a variety of C. 

 Dalrieims, in which the apophyses are larger, and dorsal ridge 

 longer. x 8. Collection. — J. Bennie. 



Fig. 14. — Side view of same ; the vertical posterior end is well 

 shewn. x 8. 



Chiton Armdroiujianus, Etheridge, jun. 



Fig. 15. — An entire posterior plate of this species, with portions 

 of ornamentation enlarged ; Williamwood, near Glasgow. x 3. 

 Collection. — J. Armstrong. 



* Unless otherwise stated the examples figured are from Law Quarry. 



