624 



MISS JANE DONALD ON CARBONIFEROUS 



fig. 2) is the upper part of a shell, of which five entire whorls are 

 preserved, and a portion of another. 



Length 23 millim., height of lower whorl about 5| millim. 



Formation. Carboniferous limestone. 



Murchisonia kendalensis, M'Coy. (PI. XXIV. figs. 3-5.) 



Rostellaria angulata, J. Phillips, 1836, ' Geol.Yorks.' vol. ii. p. 230, 

 pi. xvi. fig. 16 (sinistra). 



Non Murchisonia Verneuiliana, L. G. de Koninck, 1843, ' Precis 

 element, de Geologie, par. J. J. d'Omalius d'Halloy,' p. 516. 



Non Murchisonia Verneuiliana, L. G. de Koninck, 1843, ' Descr. 

 des Anim. Foss. du Terr. Carb. de la Belgique,' p. 414, pi. xxxviii. 

 fig. 5. 



Murchisonia Verneiiiliana, var. hendalensis, F. M'Coy, 1855, 

 ' Brit. Pal. Rocks,' p. 532, pi. 3 h. figs. 11 and 12. 



Murchisonia Verneuiliana, var. Jcendalensis, J. J. Bigsby, 1878, 

 ' Thes. Devonico-Carboniferus,' p. 327. 



Non Murchisonia Verneuiliana, L. G. de Koninck, 1883, ' Eaune 

 du Calc. Carb. de la Belgique,' p. 25, pi. xxxiv. figs. 35, 36, 37. 



Shell elongated, conical, composed of from eleven to seventeen 

 gradually increasing whorls. A little below the middle of each 

 whorl is a broad, flat band, which represents the sinus in the outer 

 lip. It is solid, and bounded by two fine grooves on the lower 

 whorls, but on the upper whorls it is frequently hollowed out in the 

 centre, forming two keels, separated by a groove. Above the band 

 the whorl is almost flat, while below it is slightly convex. The 

 surface of the whorls is smooth, with the exception of the lines of 

 growth, which are strong and irregular ; they curve back to the band 

 above and forwards below; on the band they are strongly arched 

 (fig. 3 a). On some specimens there is a strong angle on the body- 

 whorl below the band, which is visible just above the sutures on the 

 upper whorls. On many specimens, however, the base is rounded, 

 and the angle is scarcely visible. There is a small umbilicus. The 

 sutures are deep. The mouth is longer than wide, but it is not well 

 preserved in any of the specimens I have seen. 



M'Coy thought this shell might be a variety of M. Verneuiliana, 

 de Kon. ; but de Koninck doubts its being identical with his species, 

 and, after the examination of his specimens at Brussels, I certainly 

 think the differences are sufficiently marked for, it to constitute a 

 distinct species. It is a much more solid-looking shell than M. 

 Verneuiliana, de Kon., the spiral angle is less, the whorls more 

 numerous, and the form of the band is usually different ; it also 

 possesses an umbilicus. 



Should it be deemed advisable to take the tricarinate shell as the 

 type of M. angulata, Phill., this shell must be called M. hendalensis, 

 M'Coy. Otherwise, of course, the name kendalensis must be 

 dropped, and this must be termed M. angulata, Phill., while the 

 tricarinate shell must have a new name. 



M'Coy identifies this shell with the Devonian species M. angulata, 



