﻿LOXONEMA. 177 



suture much deeper. The striae also seem to arch in the reverse direction, though 

 it may be questioned how far their figure accurately depicts them. 



Holopella subulata, F. A. Romer, 1 as given in his later work, has fewer and 

 straighter striae and shorter whorls. It has been renamed L. Rcemeri by Kayser, 

 as Rorner's earlier figure represented a totally different species. 



Loxonema pexatum, Hall, 2 L. Hamiltonise, Hall, 3 L. rectistriatum, Hall, 4 and 

 L. delphicola, Hall, 5 are all very kindred species, but differ in having much shorter 

 whorls. It is quite possible, however, that L. Hamiltonise may be, as Hall at 

 first thought, a variety of Sowerby's Loxonema nexile. 6 



3. Loxonema reticulatum, Phillips. PI. XVIII, figs. 1 — 3. 



1841. Loxonema beticulata, Phillips. Pal. Foss., p. 139, pi. lx, fig. 187*. 

 1841. — ? pb^tebita, Phillips. Pal. Foss., p. 100, pi. xxxviii, figs. 187 a, b 



(not c). 

 ? 1844. Melania depebdita, Goldfuss. Petref. Germ., vol. iii, p. 109, pi. cxcvii, 



fig. 12. 



1853. Loxonema beticulata, Sandherger. Verst. Rhein. Nassau, p. 231, pi. xxvi, 



figs. 13, 13 a. 



1854. — beticulata, Morris. Cat. Brit. Foss., p. 255. 

 1857. — steiata, Eichwald. Bull. Soc. Nat. Moscow, p. 160. 



1860. Macbochilus bteiatus, Eichwald. Lethasa Rossica, p. 1118, pi. xliv, 



figs. 14 a, b. 

 ? 1887. Loxonema, sp., Tschernyschew. Mem. Com. Geol. Russ., vol. iii, No. 3, 



p. 171, pi. v, figs. 12, 13. 

 1888. — beticulata, Etheridge. Foss. Brit., vol. i, Pal., p. 163. 



1888. — pb^teeita, Etheridge. Ibid., p. 163. 



Description. — Shell large, spiral, many-whorled, turreted, elongate, pointed. 

 Whorls seven or eight, regularly increasing, evenly convex, slightly flattened 

 immediately below the suture, covered by numerous sigmoidal, perpendicular, 

 distant threads, which are crossed by similar and equally distant spiral threads, 

 so as to form a rough reticulation clearly visible to the naked eye. Body-whorl 

 rapidly rounding in below. Aperture subcircular. Columella straight, some- 

 what produced below. Suture simple, shallow, thread-like. Shell-structure 

 thick. 



1 1866. F. A. Romer, ' Beitr.,' pt. 5, p. 8, pi. ii, figs. 4«, b. 



2 1879, Hall, ' Pal. N. ¥.,' vol. v, pt. 2, p. 42, pi. xiii, figs. 13, 16, 18. 



3 Ibid., p. 45, pi. xiii, figs. 15 and 17. 



4 Ibid., p. 130, pi. xxviii, figs. 9, 9 a. 



5 Ibid., p. 47, pi. xiii, figs. 19 — 25, and pi. xiv, figs. 1, 2. 



c 1843, Hall, ' Geol. N. T. Surv. 4th Geol. Dist.,' p. 20L. 



