564 MISS JANE DONALD ON THE GENERA [Nov. I906, 



typical of the species. Even then he cannot reconcile Hall's state- 

 ment, of there being a sharp ' retral curve ' of the striae on the 

 band, with the figure 5 e, where the lines indicate a shallow sinus 

 such as Dr. IJlrich has observed to be the case on individuals that 

 he takes as typical bicincta. I must also remark that the band is 

 here represented much wider than in his figures of bicincta. 



I have compared the Scottish specimens with examples of Murchi- 

 sonia bicincta, Salt., 1 in the British Museum (Natural History), and 

 find that they greatly resemble one another, with the exception that 

 the lines of growth below the band appear slightly more oblique on 

 the latter, a circumstance which has caused Dr. Ulrich to consider 

 it a distinct species, which he has named Lophospira obliqua. 



Dimensions. — The specimen figured in PI. XLIV, fig. 2 has 

 the apex broken ; the four remaining whorls = 15 millimetres in 

 length and 12*5 mm. in width. The other example also has the 

 apex broken, and only three whorls remain which = 9*5 mm. in 

 length and 9 mm. in width. 



Locality and Horizon. — Balclatchie (Ayrshire), in beds of 

 Llandeilo age [Lapworth]. Messrs. Peach, Home, & Macconochie 

 record this species from the Llandeilo of Minuntion and the Middle 

 Bala of Shallock Mill in the same county ; but I have not met 

 with it in any of the Scottish collections from these localities. 



Lopbtosptea bicincta (Hall) var. scotica nov. (PI. XLIV, figs. 3 



& 4 and text-fig. 2.) 



This variety resembles the type in every particular, except that 



^. the upper keel is about midway between 



Fig. 2. - Lophospira the band and ihQ gut also there is 



bicincta, *,«r. scotica another ^ Mer kee} ftt the 8utur ^ and 



nov from the Llan- the sheU ig all of ter gize< It 



dfo of Balclatchie. seemg the more abundant form> as there 



Magnified J, cha- are eight specimens in Mrs> Gray > s col _ 



lection. It resembles L. hiimilis, Ulrich, 2 

 in ornamentation, but the spire is not so 

 depressed. Dr. Ulrich considers that L. 

 humilis is closely allied to L. bicincta. 

 Where the outer surface is not well- 

 preserved both on the type and on the 

 variet} T , the sinual band appears as merely 

 a single strong keel, the finer bordering 

 keels being obliterated. 

 Dimensions. — The specimen figured in PI. XLIV, fig. 3 has 



the apex broken, leaving only three whorls, which = 18*5 millimetres 



in length and 16 mm. in width. Width of specimen of which the 



aperture is shown (PI. XLIV, fig. 4) = 18 mm. 



Locality and Horizon. — Balclatchie (Ayrshire), in beds of 



Llandeilo age [Lapworth]. 



1 Geol. Surv. Canada, ' Canadian Organic Eemains ' dec. i (1859) p. 19 & 

 pi. iv, figs. 5-6. 



2 Final Sep. Geol. & Nat. Hist. Surv. Minnesota, vol. iii, pt. ii (1897) 

 p. 968 & pi. lxxii, figs. 12-15. 



