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



seven and a half whorls, whose length = about 8f mm., width 

 = 2-i- mm. The smaller example (PL III, fig. 16) has five whorls 

 preserved, of which the length =5 mm., width = 1| mm. ; its whorls 

 are slightly more exsert, and therefore appear higher in proportion 

 to the width than the others. 



Lomlity and Horizon. — Law, Dairy, in the Lower Limestone 

 Series (cF). Mr. Keilson possesses one specimen from the Upper 

 Limestone Series of Glencart, Dairy (d^). 



A shell in the collection of ]VI. Destinez at Liege, from Yise, 

 strongly resembles this species ; the lines of growth are distinctly 

 preserved on it, and are those characteristic of the genus, being 

 sigmoidal, and coming prominently forward below. 



ACLISINA ATTENFATA, Sp. nOV. (PI. lY, figS. 2 & 3.) 



Terehra or Turbo clavicula longissima (pars), D. Ure, 1793, 'History of Ruther-- 

 glen & E. Kilbride,' p. 308 & pi. xiv, %. 11. 



Turritella elongata (pars), J. Fleming, 1828, 'Brit. Animals,' p. 305. 



Description. — Shell slender, elongated, composed of more than 

 nine whorls. Whorls rather wide in proportion to the height, 

 convex below, flat or slightly concave above, increasing very gra- 

 dually. Whorls ornamented on the lower two-thirds by five raised 

 threads, the two uppermost of which are the strongest and furthest 

 apart ; there are several additional fine threads on the body-whorl ; 

 the upper third of the whorl is smooth, or sometimes there is a very 

 fine thread near the middle. Sutures not much inclined. Base 

 convex. Aperture rounded. Columella nearly straight, slightly 

 thickened. 



HemarJcs. — None of the specimens that I have examined have the 

 protoconch entire. One has a small portion preserved showing 

 the junction with the conch, upon which the ornamenting threads 

 commence almost immediately. 



Resemblances. — This shell strongly resembles A. elongata var. 

 varians in its ornamentation, but the space between the two- 

 strongest threads is greater, and the fine threads below are not so 

 numerous. It also diff'ers in having a smaller spiral angle. It 

 bears some likeness to A. costatida in its slender form, but the two 

 upper threads are much stronger in comparison with the lower ones. 

 It appears to be a well-marked form intermediate between these 

 two species. 



Locality and Horizon. — There are six specimens in the Ure Col- 

 lection in the rooms of the Royal Society of Edinburgh. One has 

 five whorls preserved whose length =2 mm., width = rather less 

 than 1 mm. There are specimens from High Blantyre in my own 

 collection, given me by Dr. Young, and in Dr. Hunter- Selkirk's 

 collection from East Kilbride. The latter also possesses examples 

 from Erankara Hall. In the collection of Mr. Neilson there are 

 several individuals from Capeli'ig. All the above are from the 

 Lower Limestone Series {d^). It also occurs in the Upper Lime- 



