Yol. 65.] THE GENTJS LOXONEMA. 215 



of which he refers to Loxonema s. str. and seventeen to Slylonema. 

 All of these occur in E. e 2 except one, namely, L. (Stylonema) 

 Zibens, Barr., which is from E. e 1. None of the Bohemian species 

 appear to be represented either in Britain or in Scandinavia. 



In America two Ordovician and about thirteen Silurian species 

 are recorded, but few are sufficiently well represented to show 

 whether they really belong to the genus sensu stricto. 



Loxonema sinuosum (Sow.). (PL X, figs. 1 a & 1 6.) 



Terebra (?) sinuosa, J. de C. Sowerby, 1839, ' Silurian System ' p. 619 & pi. viii, 



fig. 15. 

 Loxonema sinuosum (Sow.), J. Phillips, 1841, ' Pal. Foss. Cornwall, Devon, &c.' 



p. 98, non p. 99 & pi. xxxviii, fig. 182. 

 Non Terebra (?) sinuosa (Sow.), J. W. Salter, 1848, Mem. Geol. Surv. vol. ii, 



pt. i, p. 357 & pi. xiv, fig. 2. 

 Loxonema sinuosum pars, H. G. Bronn, 1848, ' Index Palseont.' p. 670. 

 Terebra sinuosa, T. Brown, 1849, ' Illustr. Foss. Conch. Great Brit. & Irel.' 



p. 251 & pi. xxxiii* fig. 62. 

 Loxonema sinuosum, A. d'Orbigny, 1850, 'Prodr. Paleont. Strat.' vol. i, p. 29. 

 Loxonema sinuosum, J. Morris, 1854, 'Catal. Brit. Foss.' p. 255. 

 1 Loxonema sinuatum, F. Schmidt, 1858, Arcliiv fur die Naturkunde Liv- Ehst- 



& Kurlands, ser. 1, vol. ii, p. 202. 

 Loxonema sinuosum, J. Sowerby, 1867, ' Siluria ' 4th ed. p. 532 & pi. xxiv, fig. 3. 

 Loxonema sinuosum pars, J. J. Bigsby, 1868, 'Tbes. Sil.' p. 156. 

 ? Loxonema sinuatum, S. P. Woodward, 1871, ' A Manual of the Mollusca ' 2nd ed. 



p. 141. 

 /Loxonema sinuosum, J. W. Salter, 1873, 'Catal. Cambr. & Silur. Foss.' p. 172. 

 Loxonema sinuosum, A. C. Ramsay, 1881, 'Geology of N. Wales' Mem. Geol. 



Surv. 2nd ed. p. 468. 

 Loxonema sinuosum, J. D. La Touche, 1884, ' Geol. of Shropshire ' p. 49 &pl. xviii, 



fig. 637. 

 Non Loxonema sinuosum, G. Lindstrom, 1884, ' Silur. Gastr. & Pter. Gotland ' 



Kongl. Svensk. Vet.-Akad. Handl. n. s. vol. xix, no. 6, p. 142 & pi. xv, 



figs. 1-5, 7. 

 Loxonema sinuosum, P. Fischer, 1885, 'Manuel de Conchyliologie & de Paleonto- 



logie Conchyliologique ' p. 696. 

 Loxonema sinuosum, 11. Etheridge, 1888, 'Foss. Brit. Is.' vol. i (Pal.) p. 112. 

 Loxonema sinuosum, E. Koken, 1896, ' Die Leitfossilien ' pp. 106, 458 {non p. 515). 

 ? Loxonema sinuosum, J. Home & B. N. Peach, 1899, Mem. Geol. Surv. 'Silur. 



Rocks of Brit.' vol. i, p. 682. 

 ? Loxonema sinuosum, B. N. Peach, J. Home, & A. Macconochie, 1901, in 



' Fauna, Flora & Geol. of Clyde Area,' publ. by local Comm. for Meeting of 



Biit. Assoc. (Glasgow) p. 438. 



Diagnosis. — Shell subulate ; whorls more than four, increasing 

 at a moderate rate, smooth, slightly convex, but little adpressed at 

 the suture. Lines of growth fine, sharp, strongly sigmoidal, 

 indicating an almost right-angled sinus in the outer lip ; greatest 

 sinuosity near the middle of the whorl. Aperture not visible. 



Remarks and resemblances. — The holotype is in the 

 Museum of the Geological Society of London (B 6695) ; it is partly 

 embedded in the matrix, and only four whorls are preserved. It is 

 remarkable for having the lines of growth so strongly bent as almost 

 to form a right angle near the middle of the whorl. The shell is 

 slightly broken immediately below the suture of the body-whorl, 

 and the earlier whorls are merely represented by an internal mould, 

 therefore the adpression at the suture is not well shown. I have 

 previously pointed out l that Salter made a mistake in referring 



1 Quart. Journ. Geol. Soc. vol. lv (1899) p. 265. 



