220 MISS J. DONALD ON THE GENUS [May 1 895, 



by a keel, probably represents the sinual band ; there are two finer 

 keels below and one above. Lines of growth not discernible. 

 Mouth rounded. Base flattened. Columella nearly straight. 



The species which this most resembles is M. quadricarinata, 1 

 M'Coy, but the whorls are more convex, the sinual band is situated 

 on the most prominent part of the whorl instead of above the angle, 

 and the keels limiting it are about equal in strength ; besides which 

 the base is more flattened. 



The collection of Dr. John Young, Glasgow, contains four speci- 

 mens of this species : one (PI. VIII. fig. 1) has eight whorls pre- 

 served ; it is about 4 miliim. in length, and about lg millim. in 

 -width. I also have portions of two additional shells which 

 Dr. Young has given me. 



Locality. Glencart, Dairy. 



Formation. Tipper Limestone Series (d?). 



Mr. John Smith, Kilwinning, has a single specimen (PI. VIII. 

 figs. 2, 2 a) consisting of twelve whorls ; the apex is entire, but the 

 base is slightly broken. Length about 4| millim., width li millim. 



Locality. Law, Dairy. 



Formation. Lower Limestone Series (d 3 ). 



Murchisonia dispae, M'Coy. (PI. VIII. figs. 3-8.) 



Murchisonia dispar, F. M'Coy, 1853, Ann. & Mag. Wat. Hist. ser. 2, vol. xii. 

 p. 191 ; F. M'Coy, 1854, ' Contrib. Brit. Pal.' p. 259 ; F. M'Coy, 1855, ' Brit. 

 Pal. Eocks and Foss.' p. 531, pi. 3 i, figs. 37, 37 a; ?E. Tietze, 1871, 'Pala;on- 

 tographica,' vol. xix. p. 141, pi. xvii. fig. 22 ; J. J. Bigsby, 1878, 'Thes. Dev.- 

 Carb.' p. 325 ; R. Etheridge, 1888, ' Foss. of Brit. Islands,' vol. i. Palaeozoic, 

 p. 301 ; H. Woods, 1891, ' Cat. Type Foss. in Woodwardian Museum,' p. 107. 



? Murchisonia aiigulata, L. G. de Koninck, 1883, ' Faune du Calc. Carb. de 

 la Belgique,' vol. viii. pt. iv. p. 18, pi. xxxiv. fig. 4 (in Annates Mus. Roy. Hist. 

 Nat. Belgique). 



Shell elongated, turriculated, composed of more than seven 

 whorls. Whorls angular below the middle, slightly convex above, 

 flattened below, body-whorl produced. Sinual band situated on 

 the angle, composed of a strong and prominent keel with a fine 

 line on each side of it. Ornamented above the band by about six 

 spiral lines; sometimes two are decidedly stronger than the rest, 

 while the two upper ones are generally the finest. Below the band 

 on the body-whorl there are numerous and stronger keels, with one 

 or two fine lines between them ; the upper six keels are usually the 

 strongest ; only two or three of these keels with the alternating 

 lines are visible on the spire, the rest being hidden below the suture ; 

 the space between the third and fourth keels is the widest. Lines 

 of growth fine, curving backwards to the band above and forwards 

 below. Sutures oblique, fairly deep. Mouth longer than wide. 

 No umbilicus. Test thin. 



The form which this species most resembles is M. angulata of 

 De Koninck, but the specimen figured by him is smooth above the 

 angle, showing no traces of spiral lines ; also the angle is higher up 



1 ' Notes on some New and Little-known Species of Carb. Murchisonia,' 

 Quart. Journ. Greol. Soc. vol. xlviii. (1892) p. 564, pi. xvi. figs. 3-6. 



