4 



BEITISH FOSSILS. 



Explanation of Plate I. 



rig. 1. Upper side of Temnechinus excavatus, showing the deep and conspicuous inter- 



ambulacral sulcations. 

 rig. 2. Under side. 



Fig. 3. Side view of the same specimen. 



Fig. 4. The apical disk seen from above and magnified. 



Kg. 5. The same seen laterally, showing the steep sides of the genital plates, and the 



intermediate eye plates. 

 Fig. 6. Ambulacral and interambulacral plates, taken from the sides just below the 



confluent sulci. 



Fig. 7. Similar plates, taken from the neighbourhood of the mouth. 

 Fig. 8. An internal ambulacral arch. 

 Fig. 9. A spine highly magnified. 



Note on the species of Temnechinus. 



I have met with four species of this genus, all of which are described in my 

 " Monograph of British Tertiary Echinoderms," contained in the publications of the 

 Palseontological Society. These are 



1. Temnechinus turhinatus. Forbes. 



From the Eed Crag of Sutton. 



2. Temnechinus excavatus. Wood. 



3. Temnechinus melocactus. Forbes ; and 



4. Temnechinus globosus. Forbes. 



AU three from the Coralline Crag. 



Edward Forbes. 



Octoher, 1852.. 



