Vol. 62.] OMOSPIRA) LOPHOSPIRA, AND TURRITOMA. 559 



imperfectly known, but was probably trilineate. Lines of growth 

 sharp and regular, curving back to the band above and forward 

 below. Ornamentation consisting of a keel below the suture and 

 another below the band, which is covered by the suture on the 

 earlier whorls. Aperture longer than wide, imperfectly represented. 

 Base produced. 



Eemarks and Resemblances. — There are four specimens of 



this species in Mrs. Gray's collection, and two in the Geological 



Survey Collection, Royal Scottish Museum, 



Fig. 1. — Lophospira which are all imperfectly preserved. The 



excavata,sp. nov., lines of growth are clearly seen on a portion 



from the Llan- of the surface of one of Mrs. Gray's examples, 



deilo of Minuntion but not on the band, which is much worn on 



(Gray Collection), all the shells ; there are traces of a fine line 



Magnified 4 dia- on each side of the central ridge. This 



meters. species is distinguished from L. bicincta (Hall) 



by the spire being slightly higher, the lines 



of growth being more oblique below the band, 



and the band appearing somewhat wider. It 



greatly resembles L. obliqua, Ulr. 1 (Murchisonia 



bicincta. Salt.), but the spiral angle is less, 



the shell being rather longer in proportion 



to the width. The whorls are also more 



excavated above the band than in either of 



these species. 



Dimensions. — The specimen figured in 

 PL XLIII, fig. 6 has the apex broken, leaving about four whorls 

 which = 20 millimetres in length and 14 mm. in width. The 

 shell, of which a portion of the surface is illustrated in the appended 

 figure, also has the apex broken, and the four remaining whorls 

 = 16 mm. in length and 11 mm. in width. 



Locality and Horizon. — Minuntion (Ayrshire), in rocks of 

 Llandeilo age [Lapworth]. 



Lophospira variabilis, Don. 



For description and figures see Quart, Journ. Geol. Soc. vol. lviii 

 (1902) p. 334 & pi. ix, figs. 7-10. 



Remarks. — Since writing the description, I have met with ten 

 more specimens of this species, as well as many internal moulds, all 

 in Mrs. Gray's collection. 



Lophospira borealis, Don. 



For description and figures see Quart. Journ. Geol. Soc. vol. lviii 

 (1902) p. 333 & pi. ix, figs. 5 & 6. 



Lophospira trispiralis, sp. nov. (PL XLIII, figs. 7 & 7 a.) 



Diagnosis. — Shell small, turreted, composed of about nine 

 gradually-increasing whorls. Whorls angular, flat or slightly 



1 Final Rep. Geol. & Nat. Hist. Suit. Minnesota, vol. iii, pt. ii (1897) p. 965 

 & pi. lxxii, tigs. G--8. 



