SPECIES OF CAEBONIFEEOTJS MUECHISOXIA. 573 



are not well preserved, it is uncertain whether it possesses the other 

 characteristics of Coelocaulus — viz., the narrow umbilicus, vertical 

 columella, and reflected peristome. Its compact flattened whorls 

 distinguish it from Hormotoma. 



It is quite distinct from any other Carboniferous species in Britain 

 that I am acquainted with. But it bears a strong resemblance to the 

 Silurian forms Terehra (?) sinuosa, Salter,^ Turritella cingulata, 

 Hisinger,^ and Murcliisonia Ayma,^ Billings. It is evidently closely 

 allied to the Devonian shells described by D.-P. GEhlert, of which 

 M. Davidsoni * is the type. 



Length 11 1 millim. ; width of penultimate whorl 4| millim. ; 

 height 2 1 millim. 



Locality. There are only two specimens in the Tate Collection, 

 Alnwick. That figured is from Lewis Burn, the other from Caw- 

 hope. 



Formation. Calciferous Sandstone Series. 



Section Ceeithioides, Haughton, 



Shell elongated, conical, whorls slightly convex, smooth, band not 

 raised above the surface ; base flat, grooved. No umbilicus. Mouth 

 probably subrhomboidal. 



Mtjechisonia (Ceetthioldes) telescopium, Haughton. (PI. XYII. 

 figs. 1, 4, 5, 8.) 



Cerithioides telescopium, Kev. Prof. Haughton, 1859, ' On some 

 Fossil Pyramideliidae from the Carb. Limestone of Cork and Clonmel,' 

 Proc. Dublin University Zool. & Bot. Assoc, vol. i. pt. iii. p. 282, 

 pi. XX. figs. 2, 3, 4. 



? Murchisonia maxima, L. G. De Koninck, 1883, ' Paune du Calc. 

 Carb. de la Belgique,' vol. viii. pt. 4, p. 26, pi. viii. fig. 7. 



? Gly^ptohasis conica, ibid. p. 92, pi. viii. figs. 4-6. 



Shell large, conical, composed of more than nine whorls. Whorls 

 smooth, flattened, slightly convex, the lower whorls becoming more 

 convex in the larger specimens. Sinual band wide, situated below 

 the centre of the whorl, very slightly sunk below the surface, bounded 

 on each side by a shallow groove. Lines of growth curving back- 

 wards to the band above and forwards again below, obscure on the 

 band itself. Base very flat, ornamented by numerous spiral lines 

 alternately strong and fine, separated by grooves which become gra- 

 dually wider towards the outer margin. Mouth imperfectly known, 

 probably subrhomboidal. No umbilicus. Shell-structure thin. 



This shell is quite distinct from any British species with which I 

 am acquainted, but it bears a strong resemblance to two Belgian 

 shells — namely, Murchisonia maxima and Glyptohasis conica, De 

 Koninck. I have examined the specimens of these in the Brussels 



1 Mem. Geol. Surv. 1848, vol. ii. pt. i. p. 357, pi. xiv. fig. 2. 



2 ' Leth. Suecica,' 1837, p. 39, pi. xii. fig. 6. 



3 ' Canad. Nat. and Geologist,' vol. iv. 1859, p. 358, fig. 8. 



* Bull. Soc. d'Etudes Scientifiques d' Angers, 1887, p. 20, pi. vii. figs. 4^4 d. 



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