Vol. 51.] MURCHISONIA AND ITS ALLIES. 227 



MxmcHisoNiA (Hxpergonia) eastigiata, sp. nov. (PL IX. fig. 4.) 



Shell elongated, turriculated, composed of more than eight whorls. 

 Whorls gradually increasing, convex, slightly angular above the 

 middle, more convex below the angle than above. Sinual band 

 broad, situated above the angle, bounded by a keel on each side 

 with a fine thread down the middle. Three keels below the band 

 on the spire, an additional one on the body-whorl, and one keel 

 above the band just below the suture ; space between this uppermost 

 keel and the band the widest. Lines of growth not preserved. 

 Sutures deep and oblique. Mouth longer than wide. No um- 

 bilicus. 



There is only one specimen of this species in the Museum of 

 Practical Geology, London. It somewhat resembles M. quinque- 

 carinata, var. •pulchella, 1 in shape, but may be distinguished by its 

 more convex whorls and also by the form of the sinual band. The 

 spiral angle is smaller than that of M. pentonemis, 2 the sutures are 

 more oblique, and the sinual band is different. 



The apex of the shell is broken and only seven and a half whorls 

 remain, of which the length is 16| millim. ; width of body-whorl = 

 5 millim. 



Locality. Clattering Ford, Cumberland. 



Formation. Calciferous Sandstone Series (dr). 



Mttechisonia (Hypergonia) M'Coti, sp. nov. (PL IX. fig. 5.) 



Shell very elongated, turriculated, composed of more than seven- 

 teen whorls. "Whorls angular, increasing very gradually. Angle a 

 little below the middle of the whorl bearing a strong keel, and 

 having two slighter ones above and two below. The widest space is 

 that between the keel on the angle and the lower of the two above : 

 it probably represents the position of the sinus. Lines of growth 

 not visible. Base convex, columella simple. Mouth imperfectly 

 known. 



As neither the mouth nor the lines of growth are preserved, we 

 cannot be certain whether this is a species of Murchisonia or 

 Aclisina. I refer it to the former on account of its great similarity 

 to other members of the genus, especially to M. quadricarinata, 

 both in the form and ornamentation of the whorls ; but it is more 

 elongated, having a much smaller spiral angle. It occurs as 

 external casts in an impure limestone, and perfect representations of 

 the shell are obtained by pressing wax into the cavities. 



Length of specimen figured (PI. IX. fig. 5) = 7 millim. ; width 

 = lg millim. 



Locality. Widdle Pell, Wensleydale. 



Formation. Yoredales (d s ). 



Mr. J. Smith also possesses three specimens of this species. The 

 whorls are not quite so angular ; as many as seventeen are 



1 'Notes on some New and Little-known Species of Oarb. Murchisonia] 

 Quart. Journ. Geol. Soc. vol. xlviii. (1892) p. 566, pi. xvi. fig. 7. 



2 Ibid. p. 569, pi. xvi. figs. 10-12. 



