EXPLANATION OF THE PLATES. 



Figs. 8. & 9. have large rugose impressions derived also from pressure of the intes- 

 tines. Small fish-scales are seen on the surface of figs. G. & 9. 



Fig. 4. is black, and is the specimen which Dr. Prout's analysis shows to be coloured 

 probably by Sepia. 



PLATE XXIX. 



Fig. 1. Large Coprolite, showing the transverse section at the upper end of its folded 

 lamina, and containing fish-scales. 



Fig. 2. Portion of a large Coprolite in the collection of Captain Waring, containing 

 an undigested vertebra of Ichthyosaurus and fragments of other large bones. 



Fig. 3. Opposite side of fig. 2. exhibiting the same vertebra, and two smaller ones. 



Fig. 4. Part of the largest Coprolite yet discovered at Lyme, exhibiting vertebrae of 

 Ichthyosaurus at its fractured surface. 



Fig. 5. Portion broken from fig. 4. showing the same vertebrae, and the coracoid bone 

 of an Ichthyosaurus imbedded in it : this bone has been transferred in the draw- 

 ing to A, from its real place at B, on the other side of the specimen. 



PLATE XXX. 



Figs. 1. to 12. inclusive, are Coprolites from the lias at Lyme Regis. 



Fig. 1. Sauro-coprus, containing rings, resembling the horny rings in the cups of the 

 suckers of Sepiae ; it also shows the edge of the folded lamina. 



Fig. 2. Sauro-coprus full of fish-scales, and at the point A containing a congeries of 

 small rings resembling those at the extremity of the arm of a small Sepia. 



Fig. 3. Magnified appearance of the rings at A. fig. 2. 



Fig. 4. Coprolite full offish-scales, and exhibiting no traces of folded structure. 



Fig. 5. Amorphous Coprolite, thin and flattened ; it appears to have been evacuated 

 in a semi-fluid state before it was moulded to the usual shape in the intestines. 



Figs. 6. to 12. inclusive. Small Coprolites from the lias at Lyme Regis, resembling 

 many of those in the lias on the Severn ; they are without spiral structure. 



Figs. 7. 10. 11. & 12. have small fish-scales in them. 



Figs. 13. to 29. inclusive. Coprolites from the bone bed in the lowest lias at West- 

 bury-on-Severn, Aust Passage, and Blue Anchor near Watchet; they are mostly 

 black, smooth, and glossy; and many of them have small round points (like those 

 on urinary calculi) irregularly projecting from their surface, but they contain no 

 uric acid ; it is unknown from what animals they are derived ; kw of the forms 

 ■ here represented occur among the Coprolites at Lyme Regis. 



Figs. 17. & 18. exhibit on their surface a convoluted etructure. 



Fig. 19. contains small scales and fragments of small bones : scales and bones are 

 rare in the Coprolites from the Severn district. 



