410 Description of the Fossils in the older Deposits of the Rhenish Provinces. 



Fig. 16. LeptcBua plicata. Semicircular, slightly convex, plaited ; plaits about 25, branched near the 

 margin ; hinge-line about three-fourths the length of the shell ; lower valve nearly flat, with a narrow 

 descending plaited border. A species of Leptcena, which bears much resemblance to an Orthis, especially 

 Orthis Flabellulum, but does not agree with that genus in the form of the hinge. If Leptcena and Pro- 

 ducta were to be considered two genera, this would be a species of Leptcena. Loc. Haustig near Siegen. 

 (a, a.) Inside of the upper valve. 

 (b.) Outside of the lower valve, 

 (c.) Inside of the lower valve, all casts. 

 Fig. 17. Homalonotus Knightii (Silurian System, 651, pi. 7. fig. 7)- Loc. Daun. 



NOTE BY MM. DE VERNEUIL AND D'ARCHIAC, September 10, 1842. 



Since our Table was sent to press, we have received the Fifth Number of Count Miinster's Beitrage 

 zur Petrefactenkunde. The new species described in it from the Clymenia limestone of Upper Frau- 

 conia are limited to the following number : — 



Species. 



Calymene 2 



Asaphus 1 



Otarion 2 



Harpes 1 



Posidonomya 2 



Avicula 4 



Cardium? 4 



Lunulacardium .... 1 



Species. 



Capulus 2 



Melania 1 



Euomphalus 1 



Turritella 1 



Clymenia 8 



Orthoceratites 1 



Goniatites 1 



Total 



32 



