﻿PLATE XVII. 



DEVONIAN SPECIES. 



Fig. 



1 — 3. Leptana or Orthis} laticosta, Conrad. Fig. 1, from Meadfoot, near Torquay 



(gutta-percha impressions). Collection of Geol. 

 Survey. Fig. 2, interior of ventral valve ; fig. 3, 

 internal cast of ventral valve. 



4 — 7. Orthis striatnla, Schloth. Figs. 4, 5, Middle Devonian, Woolborough Quarry. 



Collection of Mr. Lee. Fig. 6, Collection of Mr. Champer- 

 nowne. Fig. 7, young shell, Lummaton, near Torquay. 



8 — 12. „ hipparionyx ?, Vanuxem and J. Hall. Internal casts of the dorsal and 



ventral valves, from Looe, Cornwall. Figs. 8 — 11, Collec- 

 tion of Mr. Pengelly. Fig. 10, Mus Geol. Survey. 



13 — 17. „ arcuata, Phil. Fig. 13, from the original figure in Phillips' 'Pal. Foss.,' 



tab. xxvi, fig. 107. Middle Devonian, Hope's Nose, near 

 Torquay. Figs. 14, 15, from Hope's Nose. Collection of Mr. 

 Pengelly. Fig. 16, a specimen much out of shape. Fig. 17, one 

 of Phillips' figures of 0. longisulcata, * Pal. Fos. of Devon,' &c, 

 tab. xxvi, fig. 105. This is a distorted specimen, which looks 

 very like some similar ones found at Hope's Nose ; the identi- 

 fication is, however, uncertain. Locality, Linton. 



IS — 23. „ inter line a ta, Sow. Fig. 1 8, Upper Devonian, Landlake, Cornwall. Mus. 



Geol. Survey. Fig. 19, Petherwin, Cornwall. Mus. Geol. 

 Soc. Fig. 20, internal cast of ventral valve ; fig. 21, enlarged 

 interior of same valve; Petherwin. Survey Collection. 

 Fig. 22, internal casts of dorsal valve, Petherwin. Mus. 

 Geol. Survey. Fig. 23, interior of ventral valve; fig. 23\ 

 enlarged ; Petherwin. They are drawn from gutta-percha 

 impressions, made from the internal casts. 



24. „ granulata, Phil. From Middle Devonian, Woolborough Quarry. Collec- 



tion of Mr. Pengelly. This is a doubtful so-termed species. 



