﻿172 DEVONIAN FAUNA. 



convexity of its whorls and the shortness of its body-whorl. Other species, 

 however, of this genus described by de Koninck and other authors appear to 

 approach it in these characters much more nearly, and to permit it to be included 

 within the generic bounds ; and I therefore temporarily place it here, pending 

 more light being thrown upon it by the discovery of further specimens. 



Affinities. — It appears exceedingly like the Carboniferous Macro chilina Phillip- 

 siana, de Koninck. 1 The shape and size of its mouth is almost the same as in 

 that shell ; the inner lip is callous and continuous, and the slope of the columella 

 is similar, but its whorls are fewer and broader, and their curvature shows a 

 greater amount of convexity near the suture. Macrochilia Dunkeri, Holzapfel, 2 

 is a wider shell with a rather shorter spire, and with a large though very similar 

 body-whorl, which is more than half the height of the shell. 



2. Genus. — Loxonema, Phillips, 1841. 



Long spiral shells with simple apertures, effuse below, with no umbilicus, 

 and with sharp, more or less curving striae, belong to this genus, which extends 

 from the Silurian to the Trias. 



Where, as in our fossils is often the case, the mouth is defective, it is often 

 very difficult to say whether shells should belong to this genus or to Holopella. 



1. Loxonema Rcemeri, Kayser. PI. XVII, figs. 18, 18 a, 19. 



? 1835. Rissoa ? Lefebfeii, LeveiUe. Mem. Soc. Geol. Fr., vol. ii, pt. 1, p. 40, 



pi. ii, fig. 25. 

 1840. Teeebea nexilis, Sowerby (pars). Geol. Trans., ser. 2, vol. v, pt. 3, 



pi. liv, fig. 17 (smaller figure only). 

 ? 1853. Loxonema obliquiaecuatum, Sandberger. Yerat. Ehein. Nassau, p. 231, 



pi. xxvi, figs. 12, 12 a. 

 1866. Holopella subulata, F. A. Bonier. Beitr., pt. 5, p. 8, pi. ii, fig. 4 (not 



F. A. Romer, Harz., p. 31, pi. viii, 

 fig. 12). 

 1878. Loxonema R(emebi, Kayser. Abhandl. Geol. Specialk. Preuss., Band ii, 



pt. 4, p. 108, pi. xvii, figs. 3, 3 a. 



1 1881, de Koninck, ' Ann. Mus. Roy. H. N. Belgique,' vol. vi, pt. 3, p. 36, pi. iv, figs. 4, 5. 



2 1882, Holzapfel, ' Palaeontographica,' vol. xxviii, p. 250, pi. xlviii, figs. 4, 4 a, 4i. 



