570 MISS J. DONALD ON NEW AND LITTLE-KNOWN 



from Vise. The only difference lies in the uppermost keel bounding 

 the band being somewhat finer on these. 



Among shells belonging to the British Isles this form most 

 nearly resembles Turritella ? sulcifera, Portlock, and may possibly 

 be identical with it. The only known specimen of that species, 

 however, is very small and imperfectly preserved, so it is impossible 

 to identify others with it with any degree of certainty. It therefore 

 hardly appears advisable to unite them as one species, but should 

 the discovery of more and better specimens from Cullion prove them 

 to be the same, the name pentonensis must be dropped or adopted 

 as a variety of sulcifera. It also has some similarity to M. quadri- 

 carinata, M'Coy, but the sinual band is narrower, the keels bounding 

 it are more nearly equal in strength, and the widest space is above 

 the band instead of being occupied by the band itself. Length of 

 specimen (PI. XVI. fig. 10), composed of twelve whorls, 1(5 millim. ; 

 width of body-whorl 5 millim. ; height of body-whorl 5 millim. A 

 larger shell, of which only eight whorls are preserved, is 23 millim. 

 in length ; the body-whorl is crushed, so its exact dimensions cannot 

 be given. 



Locality and Formation. Fairly abundant in the Calciferous 

 Sandstone Series at Penton. It occurs in the shales of the Lower 

 Limestone Series at Law Quarry, Dairy, at Craigenglen, and at 

 Hairmyres. There are also three specimens in the Museum of 

 Practical Geology, London, from the Carboniferous Limestone of 

 Halkin Mountain, Holywell. 



MuRCHisoNiA (HrPEEaoNiA) KiRKBTi, sp. uov. (PL XVI. fig. 13.) 



Shell conical, composed of eleven or twelve somewhat rounded 

 whorls. Whorls ornamented with five keels, which, with the ex- 

 ception of the uppermost, are very strong in comparison with the 

 size of the shell. Spaces between the keels pretty equal in width. 

 Sinual band situated between the second and third keels. Lines of 

 growth curving backwards to the band above and forwards below. 

 Base slightly produced. Mouth rather longer than wide. Columella 

 simple. 



This shell may be distinguished from M. pentonensis by its greater 

 spiral angle, stronger keels, and less angular whorls. It bears 

 some resemblance to M. nana, De Kon.,^ but the keels are much 

 stronger and the whorls are' not quite so rounded. It is very 

 like M. nebrascensis,^ Geinitz, but has not so great a spiral angle 

 as that species is represented to have in the figure. 



I am indebted to Mr. J. W. Kirkby for specimens of this species. 

 Length of sheU consisting of eleven whorls 8| millim. ; width 3| 

 millim. ; height of two last whorls 3^ miUim. 



Locality and Formation. Kanderstone, Pife. Low down in the 

 Calciferous Sandstone Series, about 3000 feet below the base of 

 the Carboniferous Limestone Series, which there is equivalent to 

 the Yoredales of the North of England. 



^ ' Faune du Calc. Carb. de la Belgique,' 1883, vol. viii. pt. 4, p. 20, pi. xxxiv. 

 figs. 27, 28. 



^ ' Carbonformation und Dyas in Nebraska,' 18C6, p. 12, pi. i. fig. 17. 



