54 MISS J. DONALD ON THE GENUS ACLISINA. [Feb. 1 898,. 



Carluke ; Bowertrapping ; Eobroyston : Auchenbeg, Lesmabagow ; 

 and at Glencart, Dairy. It is remarkably abundant at Swindridge, 

 from which locality I have seen about thirteen specimens with the 

 protoconch more or less intact. Examples with the protoconch also 

 occur at Law, Eaesgill, and Bowertrapping. 



The Belgian specimens are all from Tournai, and none that I 

 have examined retain the protoconch. 



AcLisiNA ELONGATA, Fleming. (PI. Ill, figs. 6-10.) 



Terehra or Turho clavicula longissima, pars, D. Ure, 1793, ' History of Rutherglen 

 & E. Kilbride,' p. 308 & pi. xiv, fig. 11. 



Turritella elongata, J. Fleming, 1828, ' Brit. Animals,' p. 305 ; H. G. Bronn, 1848, 

 'Index Palseont.' p. 1333; T. Brown, 1849, ' Illustr. Foss. Conch. Gr. Brit. & 

 Irel.' p. 71 ; J. Morris, 1854, 'Cat. Brit. Foss.' p. 284; J. J. Bigsbv, 1878, 'Tlies.- 

 r>ev.-Carb.' p. 335 ; R. Etheridge, 1888, ' Foss. of Brit. Is.' vol. i. Pal. p. 308. 



7 Loxonema 'polygyra, M'Coy, 1844, ' Syn. Char, Carb. Foss. Irel.' p. 30 & pi. iii, 



fig. 1. 



Murcliisonia elongata, J. Armstrong, J. Young, & D. Robertson, 1876, 'Cat. of 

 W. Scot. Foss.' p. 56. 



Aclisina elongata, J. Donald, 1885, ' Carb. Gaster. from Penton, etc' Trans.- 

 Cumberl. & Westmorl. Assoc, no. ix, p. 132 & pi. ii, figs. 3, 4, 4 a & 4 J. 



Description. — Shell small, elongated, conical, composed of about 

 sixteen whorls. Protoconch of the type imperfectly known, the 

 anterior portion elevated and showing a faint rib at its junction 

 with the conch, upon which the ornamenting threads begin imme- 

 diately. Whorls convex below, rather flat above. The convex 

 part is ornamented by from five to seven raised threads, the 

 flat part by two threads, one situated a short distance above the 

 lower ones, the other just below the suture, one or both of these 

 frequently absent ; one or more additional threads on the body- 

 whorl. Sutures deep. Aperture subovoid. Inner lip reflected on 

 the body-whorl. Columella simple. Base convex, imperforate. 



Remarls. — When I wrote my paper on the ' Carboniferous 

 Gasteropoda from Penton ' I was not aware of the existence of 

 the Ure Collection, and I then regarded an elongated spiral shell 

 collected by Dr. John Young, from the same horizon as TJre's 

 specimens, as the type of Turritella elongata. I afterwards heard 

 of the collection being preserved in the rooms of the Royal Society, 

 Edinburgh, and through the kindness of Mr. Gordon I obtained 

 access to it. 



In his 'History of Eutherglen & E. Kilbride/ 1793, p. 308, the 

 Rev. D. Ure briefly describes this species as 'striated spirally,' 

 and states that it, with another shell which is ' striated trans- 

 versel}-' {Loxonema Urei, fig. 7), 'is found in a recent state on all 

 the shores of Europe. The till in which they are enveloped lies- 

 between the two strata of limestone at Stuartfield and Laurieston. 

 Many specimens are no thicker than a fine thread, and about -^^ 

 inch in length. By a microscope they are found to be equally 

 perfect, and to contain the same number of spires with the largest 

 specimens.' He calls both species Terehra or Turho clavicula 

 longissima. Later, in 1828, Fleming, in his ' British Animals,' 

 p. 305, names the spirally-striated shell Tui-riteUa elongata, but he* 



