36 SUPPLEMENT TO THE 



Budleigli-Salterton specimens of Sp. Verneuilii ; and I found no reason for attributing the 

 Lower-Devonian specimens that occur in the quartzite boulders of Budleigh-Salterton to 

 8p. Tn(/en, for they presented all the forms we find Sp. Verneuilii to assume at Eerques 

 in the Boulonnais. 



Mr. G. F. Whidborne has also found in the Middle Devonian at Lummaton a 

 ventral valve of a Spirifer (Sup., PI. II, fig. 1) which I am unable to separate from 

 Sp. Verneuilii ; and I expect it will have to be admitted that Sp. Verneuilii is not abso- 

 lutely restricted to the Upjjer Devonian, but occurs also in the middle and lower portions 

 of that system. 



In June, 1877, the presence of Sp. Verneuilii in the Upper Devonian rocks under 

 Tottenham-Court Road, London, at Messrs. Meux and Co.'s Brewery, and at a depth of 

 11 40 feet, was announced by Mr. R. Etheridge, The Devonian rocks were also reached in 

 another boring carried down by the New-River Company at Turnford or Wormley, six 

 miles south of Ware, at a depth of 980 feet (see a paper by Mr. R. Etheridge in the 

 'Popular Science Review' for July, 1879). Having myself examined the specimens 

 attributed to Sp. Verneuilii, I am able to corroborate Mr. Etheridge's identification. 

 Some of the cores may be seen in the Museum of Practical Geology, London, and others 

 in the Brighton Museum. 



Genus — Cyrtia, Dalman, 1828. 



24. Cyrtia? Whidbornei, Dav. Dav. Dev. Sup., PI. II, figs. G, 7. 



Shell transversely semicircular, broader than long ; hinge-line straight, slightly less 

 than the greatest width of the shell ; cardinal angles rounded. Dorsal valve moderately 

 convex, divided along the middle by a broad, flattened, mesial fold, slightly indented 

 along the middle. On each of the lateral portions of the valve there exist two or three 

 wide rounded ribs, of small elevation, sometimes bifurcating. Ventral valve conical, 

 divided by a deepish mesial sinus, margined by a somewhat prominent rounded eleva- 

 tion. Area large, triangular, almost flat, and bent backwards at right or obtuse angles 

 to the plane of the dorsal valve, divided along the middle by a narrow fissure arched over 

 by a convex pseudo-deltidium. Surface of the valves covered with very fine radiating 

 striae. Interior not completely known. A large specimen measured — length 7, width 1 2, 

 depth 7 lines. 



Obs. — This species was first pointed out to me by Mr. Whidborne as intermediate in 

 shape between Sp. nuda and Sp. simplex, and with markings difierent from either. It 

 seems, however, referable to the genus or sub-genus Cyrtia, and most nearly resembles 



