SANGUINOLITES SUBCARINATUS. 409 



Geological Survey of Scotland contains a tablet with seven specimens of uncrushed 

 and better preserved examples from Corrie Burn, near Kilsyth, some of which I 

 figure, PL XLVI, figs. G, 7. In spite of the fact that this shell is not at all typical 

 of the genus, either in its surface markings or in possessing an oblique ridge, I 

 think that Mr. R. Etheridge, jun., indicated its correct genus. The shell is not 

 an Edmondla, for it possesses both lunule and escutcheon. 



I am inclined to think that Mr. J. W. Kirkby has confused another species — 

 Sanguinolites clavatus — erected by Mr. R. Etheridge, jun., with ^S*. abdenensis (which, 

 by the way, he calls S. abdensls). He most kindly sent me a series of specimens 

 from the marine bands of the Calciferous Sandstone series of Fife, which he 

 referred to this species, but they undoubtedly all belong to S. clavatus. The 

 localities of the two shells belong to very different horizons ; for it will be noted 

 that 8. clavatus is found only in the Calciferous Sandstone series. 



Some specimens, PI. XLVI, figs. 8, 9, show a number of irregularly distributed 

 tubercles on the surface ; but I am not satisfied Avhether they are adventitious or 

 a constant character. Many species of the genus have a tuberculated shell, but 

 in these the tubercles are arranged in definite radiating rows. 



This species is not likely to be confused with others of the genus, from most 

 of which it ditfers by its smooth, unsulcated exterior and the absence of oblique 

 ridge. I do not understand why Mr. R. Etheridge, jun., thought it related to 

 8. angustatas, Phill., sp., which has well-marked concentric sulci and ridges over 

 the anterior two thirds of its valves. 



Sanguinolites subcakinatus, M'Got/, 1851. Plate XLVII, figs. 1 — 4, 



Sanguinolites subcaeinatus, M'Coy, 1851. Aun. Mag. Nat. Hist., ser. 2, 



vol. vii, p. 173. 



— — — 1855. Brit. Pal. Foss., p. 506, pi. 3r, 



fig. 4. 



— — Bigshy, 1878. Thesaurus Devonico-Carboniferus, 



p. 313. 



— — Etheridge, 1888. Brit. Foss., pt. 1, Palseozoic, 



p. 290. 



8pecifiG Characters. — Shell below medium size, inequilateral, transversely 

 oblong, tumid, subcarinate. The anterior end is short, narrowed from above 

 downwards, encroached on above by a large and elongate lunule, and its border is 

 elliptically curved. The inferior margin is elongated, very slightly convex, rising 

 posteriorly to form a bluntly rounded postero-inferior angle with the posterior 

 border. The latter is truncate, very slightly oblique from above downwards and 



53 



