BRITISH DEVONIAN BRACHIOPODA. 63 



Sowerby's figure (' Geol. Trans./ 2nd ser., vol. v, pi. 56, fig. 3), which represents the 

 same form and characters. The radiating striae are beyond all comparison finer, and 

 require a lens to be distinctly traced. They are remarkably close, numerous, zx^^flexuous. 

 The front margin shows no mesial concavity (which I find to be generally more distinct 

 in P. analoga than in pi. 7, fig. 10, * Geol. of Yorkshire'), the reflected border is much 

 undulated, so as to be even nodular, and the concentric rugae are so very irregular and 

 discontinuous as to give quite a difi'erent air to the whole." 



We all know how very variable Strophomena rhomboidalis is in shape and character ; 

 •and it may, therefore, be perhaps desirable to maintain the shell under description as a 

 named variety. 



Genus — Lept^na, Dalman, 1828. 



50. Lepttena ? NOBiLis, Jf'Coy, sp. Dav., Dev. Mon., PI. XVIII, figs. 19—21. 



Since describing this species at p. 86 of my 'Devonian Monograph,' a few fine 

 large examples have been found by Mr. G. F. Whidborne in the Middle Devonian at 

 Lummaton, near Torquay. One measured two inches in length, by two and three quarters 

 in breadth. The dorsal valve is concave, and marked in the same manner as the ventral. 



51. Lept^na? Looiensis, Dav. Dev. Men., p. 84, PL XVIII, figs. 13, 14. 



Described but not named at p. 84 of my ' Devonian Monograph,' and named Looiensis 

 in the Explanation of Plate, this species seems to me distinguishable from Lejpt. ? laticosta 

 by the absence of the wider median rib. As already stated, it is common in the brown 

 grits at Looe, in Cornwall,^ but it has been subsequently found in abundance by Messrs. 

 J. G. Grenfell and Whidborne in Lower-Devonian shales at the Saltern Railway-cutting, 

 behind Saltern Cove, Paignton. Another example in sandstone was found by Mr. J. E. 

 Lee at Smuggler's Cove, near Torquay. 



^ Looe Harbour, in Cornwall, is from thirteen to fourteen miles almost due west from Plymouth. 



