78 MES. .TA^'E LOXGSTAFF OX [vol. IxXlil, 



of five and four whorls respectivelv. They are from Brockle}\ 

 Lesmahagow. 



Ho lo type. — ^I would select as holotvpe the smaller of Mr. 

 Smith's specimens, as it is best preserved (PL YI, fig. 7). It 

 consists of seven and a half whorls, the length of which = 4*25 milli- 

 metres and Avidth = l*25 mm. 



Local i t v.— Moss Mullock. 



AcLTSTXA AsiLTONEXSTS (Bolton). (PL VI, fig. 9.) 



Loxuueniu ashtovense Bolton, 1907. t^ J. G. 8. vol. Ixiii, p. 464. & pi. xxx, 

 tigs. 17a-17 r. 



Remarks. — Mr. Bolton kindly lent me the holotvpe and 

 numerous other specimens of this species from the same locality. 

 I found that the lines of growth were discernible on three examples, 

 and that they indicate the form of aperture characteristic of 

 Aclisina. A figure of one of these is given in this paper (PL A'l, 

 fig. 9). On the later whorls there is a certain amount of irregu- 

 larity in the ornamenting strije, three or four near the middle arc 

 generally stronger than the others, and the spaces between them 

 are wider, while on the earlier whorls only one of the spaces is 

 Avider; sometimes very fine striae are intercalated between the 

 coarser striae. This species greatly resembles A. rohusta Stevens,^ 

 from the Coal Measures of Danville (Illinois), but it is somewhat 

 smaller, the upper part of the whorl is flatter, and the lines of 

 growth are more oblique. 



Holotype. — Op. elf. pi. xxx, fig. 17a, Bolton Collection, 

 Bristol Museum. 



Locality and horizon. — ^Ashton Vale Colliery, in the Base- 

 ment-Beds of the Bristol Coalfield. 



Genus MuRCHTSoxiA D'Archiac & T)e Verneuil. 

 Subgenus Aclisoides Donald. 

 AcLisoiDES STiuATULA (Dc Kouiuck). (PL VI, figs. 10-15.) 



Aclisina sfriatula Dc Koiiiiick, 1P81, ' Fiiaiie <lu Calcaire Carbonifere de 



Belgique ' pt. iii. Ann. Mas. Roy. Hist. Xat. Belg. vol. vi, p. 86 & pi. ix, 



tigs. 57-58; and 1883, pt. iv, vol. viii. pi, xxxiii, tigs. 41-42, & pi. xxxiv, 



figs. 49-51. 

 3furcJiisonia striatnla De Koninck, 1843, ' Description cles Aniniaux Fossiles 



du Terrain Carbonifere de Belgique' p. 415 & pi. xl, tigs. 1 n-7h. 

 Muvchisonia snbsulcafa De Koninck. 1843, op. cit. p. 416 & pi. xxxviii,. 



figs. 4 rt-4 c. 

 Aclisoides {3£nrcJiisonia) striatula De Koninck, Donald, 1898, Q. J. G. S. 



vol. liv, p. 67 & pi. V, tigs. 6-8. 

 Aclisoides striatnla, var. armstrongiana Donald, 1898, op. cit. p. 68 & pi. v, 



fig. 10 [exclude fig. 9J. 

 Bhahdospira selkirkii Donald, 1898, op. cit. p. 65 & pi. v, fig. 4. 



Remarks. — I have already stated the reason {op. cit. pp. 45, 46) 

 wh}'' this species could not be placed in the genus Aclisina : namely, 

 the presence of a sinus in the outer lip and a protoconch of different 



1 Amer. Journ. Sci. & Arts, vol. ii (1858) p. 259. See also F. B. Meek & 

 A. H. Worthen, Geol. Surv. 111. vol. v (1873) p. 596 & pL xxix, figs. 6a~6h. 



