586 J. W. KIRKBY ON MARINE FOSSILS IN THE 



though scarcely so thick-shelled as specimens of that species found 

 in the Carboniferous-Limestone series. 



Sangtjinolites abdbnsis, Etheridge, Geol. Mag. 1877, vol. iv. p. 246, 

 pi. xii. f. 9-11. 



This species is very abundant in Zones 3 and 10 of the Pitten- 

 weem and Anstruther section; it is also found in some of the 

 Eanderstone beds and in a limestone near Craig Hartle. It varies 

 somewhat in length, some examples having the posterior side more 

 drawn out, with the diagonal ridge more pronounced and slightly 

 arcuate. 



Sangtjinolites subplicatijs, sp, nov. 



This species only occurs in Limestone No. 5 at Eanderstone, where 

 the examples are usually more or less flattened by pressure. It is 

 very probably the shell termed Modiola in the east of Fife sheet 

 No. 41 of the Geological Survey Maps ; but it has more the cha- 

 racter of Sanguinolites than of the latter genus, and it does not 

 seem far removed from S. plicatus as figured by Portlock *. It may 

 be described provisionally as follows : — 



About two inches long and y^^- wide ; thin-shelled ; with 

 nearly straight and parallel dorsal and ventral margins, the latter 

 with a slight sinus below and rather behind the umbo. The 

 anterior side is short and rather pointed ; the posterior is long and 

 obliquely truncate. The umbo is wide, and from it to the postero- 

 ventral angle runs a well-marked diagonal ridge. The surface is 

 marked by strong lines of growth, which occasionally almost take 

 the form of plications. 



Sed&wigkia gigantea, M'Coy, Syn. Carb. Poss. Ireland, p. 62, pi. xi. 

 f. 40. 



I have several specimens of a large Schizodus- shaded shell from 

 Limestone No. 6, Eanderstone, which evidently come very close to 

 the Sedgwickia gigantea, M'Coy. The specimens, which are all 

 more or less crushed, are thin-shelled, from 3 to 3^- inches long, 

 2 inches wide, and have the anterior side marked with the regular, 

 strong ridges, parallel with the margin, that are characteristic of 

 the genus, the remainder of the surface being comparatively smooth. 



Pleukophorus elegans, sp. nov. 



This shell is extremely abundant in Limestone No. 10 at Eander- 

 stone, associated with Littorina scotohurdigcdensis. Prof, de Koninck 

 thinks it comes near Gypricardia cylindrica, M'Coy, though he 

 agrees in referring it to Pleurojphorus as a new species. It may be 

 described as follows : — 



Elongate, less than half as wide as long, convex, and thick-shelled. 

 Both dorsal and ventral margins slightly convex. The anterior side 

 very short, narrow, and somewhat pointed ; the posterior side 

 narrow towards the extremity and obliquely truncate. The umbos 



* Geol. Londonderry, pi. xxxiv. f. 18t 



