72 M«s. .JXSE LONGSTAFF OX [vol. Ixxiii, 



Remarks. — About sixteen specimens of this species have been 

 examined, but only one lias the protoconch intact (PL Y, tig. 8). 

 It is in Mr. J. Smith's collection, and was found by him at High 

 Smitliston, in the Upper Limestone Series. 



Holot3'pe. — Oj). cif. pi. iv, tig. 1. Bennie Collection, Eoval 

 Scottish Museum, Edinburgh. 



Locality and horizon. — Law, Dairy, in the Lower Lime- 

 stone Series. 



AcLJSiXA pusiLLA Donald. (PI. \, tig. 9.) 



AcUshia 2nisiUa\)o\uM, 1898, op. cif. p. 63 & pi. iv, ligs. 14,li«,& Ub 



rexclude fis. 15]. 

 ? Aclis'ma jparvida I.)oii:ild, 1898, pars, op. cit. p. 64 & ]>!. v, tigs. 2, 2 a, & 2 h. 



Remark s.^ — This species is distinguished by its slender form, 

 tlattened whorls, and relatively broad, Hat apex. The examination 

 of a number of specimens shows that there is a slight variation in 

 the strength of the ornamenting threads. The example of which 

 a portion of a whorl is figured {op. cif. pi. iv, fig. 15), from Grlen- 

 cart, is really A. shiiiUs, a species which A. pusilla greatly 

 resembles ; but the latter is smaller, the whorls are lower, and the 

 protoconch is flat. Several examples have the apex intact. It is 

 probable that figs. 2.2a, & 2h in pi. v. oy;. cit. represent an imma- 

 ture form of this species. 



Holotype.— 0/j. cif. pi. iv, fig. IJ:. A figure (PI. Y, Hg. 9) of 

 the protoconch of this shell is given, as that previoush' drawn 

 belonged to another specimen. Smith Collection. 



Locality and horizon, — Law, Dairy. Lower Limestone 

 Series. 



Besides the holotyi)e there are six additional specimens in the 

 Bennie Collection, and one in the Young Collection from Law, 

 Dairy ; also seven from Dykes, Kilbirnie, in tlie Smith Collection. 

 They are all from tlie Lower Limestone Series. 



Aci.isiXA ELOXGATA (Fleming). (PL Y, Hgs. 10-12.) 



AcHsina elongata (Fleming) Donald, 1898, op. cit. \). 54 & pi. iii, figs. 6-6 a. 



Remarks. — It is unfortunate that the holotype should be an 

 exceedingly small specimen w4th the apex broken, consisting of 

 four and a half whorls in a length of 2 millimetres. All the 

 gasteropods from the same locality have similar dimensions. Most 

 of the examples from Penton are of greater size ; that figured in 

 OJ). cif. pi. iii, fig. 6, is the largest, but it is not w^ell preserved, 

 being greatly crushed. The enlarged ])ortion of a whorl (fig. 6 a) 

 is part of a fragment of a shell, showing the ornamentation and 

 contour distinctly, and on the same slab Avith it are two smaller 

 specimens fairly preserved, one of which has twelve whorls with a 

 length of 5-5 millimetres. Many of the examples from Law, 

 Dairy, exhibit the ornamentation and contour well, as they are 

 preserved in such a manner as to be easily detached from the matrix. 

 Mr. R. Dunlo]) possesses an exceedingly fine series of about foi-tv 



