26 SYNOPSIS OF THE CHARACTERS OF THE 



Bellerophon (Euphemus?) globatus. Sow. sp. 



BeUerophon globatus. Sow. Sil. Syst. ? and Geol. Trans Bellerophon globatus. Phil. Pal. Fos. 



A few very obscure casts of a minute globular BeUerophon, with a pervious umbilicus, have been provi- 

 sionally referred to this species ; they are identical with those of N. Devon, which Professor Phillips has also 

 provisionally ranked with this SUurian species. 



Bellerophon (Euphemus) iNTERSECTUs. M'Coy. (PL III. fig. 10). 



Sp. Ch — Globose, umbiUcate, aperture expanded, outer lip very slightly bilobed ; back rounded, spirally 

 marked with distinct rounded ridges, intervening spaces flat, crossed by delicate transverse striae, slightly re- 

 troflexed on the middle of the back. 



This beautiful little shell is easily distinguished from the Bellerophon decussatus, or rather, perhaps, B. 

 striafus of Fleming, which it most resembles, by the want of a band ; the retictdation is also coarser. Diameter 

 one and a half hues. 



Bellerophon (Euphemus) orbiculus. M'-Coy. 



Sp. Ch. — (From the casts) globose diameter one fifth less than the width ; smootli ; spire of three whorls, 

 which are exposed in a very narrow, rounded umbilicus, whorls increasing rapidly in size; back broad, 

 roimded ; mouth arched, twice as wide as long, sides rounded ; shell very thin. 



This species difiers from the casts of the B. urii, and B. (/lobatus, in the shortness and width of the 

 mouth, and in the more broadly rounded back, its form being almost' identical with that of the B. D' Orhignii 

 (Portk.), from which it differs in its very thin shell, and smooth surface, even the casts of that species being dis- 

 tinctly sulcated. Diameter of large specimens five lines. 



Bellerophon (Euphemus) Uril Flem. sp. 



BeUerophon Urii. Flem. Brit. Anim Bellerophon Urii. Phil. Geol. York. — Bellerophon Urii. Portk. Geol. Rep. — 



Bellerophon D'Orbiguii ? Portk. Geol. Eep. 

 Sp. Ch. — Globose; mouth expanded; vimbllicus imperforate; surface with numerous, spiral, narrow, 

 rounded ridges, separated by smooth, concave fuiTows. 



This species, so common in the Glasgow coal fields, occurs occasionally in the Irish carb. limestone ; the 

 regular spiral ridges are very characteristic of the species ; the furrows are somewhat wider than the ribs they 

 separate. Diameter half an inch, thickness half an inch. 



PTEROPODA. 



CONULARIA QUADRISULCATA. SoW. 

 Conularia quadrisulcata. Sow. Min. Con. 



I have seen one imperfect large specimen from the Kildare limestone, which seemed to be of this species, 

 although larger, and tapering more gradually than the Coal Brook Dale specimens. This specimen has very 

 strong longitudinal fuiTOws at the four angles, but the furrow down the middle of each of the faces is very 

 slight. Although the surface is obviously marked with strong transverse ridges, which meet at an obtuse angle 

 in the centre of each of the sides, yet the specimen is too imperfect to determine any thing farther. 



