568 MISS JANE DONALD ON THE GENERA [NoV. I906, 



band with but a slight degree of obliquity, strongly concentric or 

 subquadrangular on the band and passing downwards almost 

 vertically. Sinus probably of moderate depth. Aperture sub- 

 quadrate ; columella slightly twisted back ; inner lip apparently 

 reflected on the body-whorl. 



Remarks and Resemblances. — The types of this species, as 

 described and figured by M'Coy in the ' Syn. Silur. Toss. Irel.', are 

 in the Museum of Science and Art, Dublin. They occur as external 

 moulds, and the drawings are made from wax-impressions. M'Coy 

 describes a variety of this species in his ' Brit. Palaeoz. Foss.' p. 294, 

 which is figured from an Irish specimen, as he considers it better 

 preserved than the English examples. This figure consequently 

 agrees with the specimens in the Dublin Museum. Through the 

 kindness of Prof. Hughes, I have been enabled to examine the 

 specimens in the Sedgwick Museum referred to as being a variety 

 of L. jmlchra by M'Coy, with the exception of the example 

 from Alt-yr-Anker, Meifod, which appears to be missing. They 

 are all external moulds, and none of them resemble this species 

 sufficiently to be considered a variety of it. That from the Middle 

 Bala slates north of Tremadoc is too poor to make anything of. 

 The specimen from the Llandovery of Mathyrafal is not a Loplw- 

 spira, as the lines of growth pass over the submedian keel without 

 being deflected to form a sinus. Those from the Llandovery of 

 Mullock Quarry, Dalquorhan, constitute a new species of Loplio- 

 spira. The only British species which L. pulchra resembles is 

 Ulrichospira similis, Don., 1 but there the band is grooved, the 

 ornamentation is different, and the lines of growth make more 

 concave curves. L. puLchra bears some likeness to L. medialis 

 var. burginensis, Ulrich, 2 in its general contour, form of band, and 

 lamellose lines of growth ; but it differs in having less oblique 

 lines of growth, a decided keel below the suture on which these 

 lines are acutely bent, and no umbilicus. Xone of the specimens 

 in the Museum of 'Practical Geology, London, marked Murchisonia 

 pulchra agree with this species ; neither have I seen any undoubted 

 representatives of it in Mrs. Gray's collection, nor in the Geological- 

 Survey Collection, Edinburgh. 



Dimensions. — The specimen figured in PI. XLIV, fig. 10, con- 

 sists of seven whorls =16 millimetres in length, and the penul- 

 timate whorl = 9-5 mm. That which is figured in PI. XLIV, 

 fig. 11, consists of portions of two whorls, which measure 9*5 mm. 

 in length and 9-5 mm. in width. 



Locality and Horizon. — M'Coy states that this species is 

 very common in the grey slate resting upon trap at GlencrafT, 

 Leenane (Co. Galway). I am informed by Mr. McHenry that this 

 rock is of "Wenlock age. 



1 Quart. Journ. Geol. Soc. vol. lxi (1905) p. 569 & pi. xxxrii. fig. 3. 



2 Final Eep. Geol. & Nat. Hist. Sury. Minnesota, xol. iii, pt. ii (1897) p. 974 

 & pi. lxxiii, figs. 30-31. 



