THE BRITISH FOSSIL BRACHIOPODA. 285 



DEVONIAN. 



1. LEPTiENA? irregularis, JRoemer. Dav., Appendix to Supplements, Vol. V, PI. 



XX, fig. 23. 



Lept^na irregularis, C. F. Roemer. Das Rheinische Uebergangsgebirge, p. 75, 



pi. iv, fig. 1, 1844. 

 — Schnur. Bescbreibung Eifel. Bracbiopoden, p. 224, pi. xli, 



fig. 3, 1853. 



Shell semicircular, broader than long ; hinge-line straight, as long as the greatest 

 breadth of the shell ; sides rounded, broadly indented in front. Ventral valve moderately 

 convex, with a deep, concave, longitudinal depression, commencing at about half the 

 length of the valve and extending to the front. Area triangular, narrow ; fissure small. 

 Dorsal valve slightly concave, flattened posteriorly. Surface of valves covered with very 

 fine radiating lines. 



Length 1 inch 4 lines, breadth 2 inches 2 lines. 



The shell is sometimes irregular in shape on account of the median depression not 

 being always situated in the middle. 



Of this species one incomplete specimen of a ventral valve only was found by Mr. A. 

 Champernovvne in the Middle Devonian at Lummaton, near Torquay. It agrees in every 

 respect with the figures published by Schnur in his work on the Eifel Brachiopoda, as 

 well as with specimens of the same sent to me by Prof. Schnur and by Dr. Kayser, 

 which they had obtained at Gerolstein, in Germany. 



Together with this species Mr. Champernowne found in the same locality a specimen 

 of Atrypa aspera, with spines half an inch in length. 



There still remains a goud deal to be done with respect to our Devonian species. 

 The Looe locality is one of considerable interest, and its fossils should be carefully 

 collected. These beds, according to Dr. Kayser, are the equivalent of the Taunus 

 Quartzites of the Rhine, the lowest Devonian deposits of that district. In them 

 Dr. Kayser found the large Bhynchonella Pengettiana and several more of our Looe 

 species, and in a similar condition of internal casts and impressions. These Rhenish 

 fossils have been described and figured by Dr. E. Kayser in his ' Neue Beitrage zur 

 Kenntniss der Fauna der rheinischen Taunus quartziten,' 1883. 



