﻿176 DEVONIAN FAUNA. 



L. commune, Maurer, agrees perfectly with Phillips's upper figure, and I have 

 no doubt of its identity with this species. 



L. nexile, (Ehlert, seems to be the same from his description, though his figure 

 (perhaps from its roughness) appears rather more coarsely striated. 



Affinities. — There is very little to distinguish the figures of Loxonema 

 Hennahianum, Sowerby, 1 from the present species, and if we judged by them alone 

 we should be obliged to unite the two. However, Sowerby describes the former 

 as having distinctly finer and straighter striae than the present shell, and with 

 this clue differences may be made out in the drawings. Most probably the 

 ornamentation in the figure of L. Hennahianum has been represented roughly, and 

 therefore does not appear to be so fine as it is in reality. The whorls also in that 

 shell seem narrower, and the spire is decidedly shorter. We shall see that there 

 is every reason to identify with that species a shell from Lummaton, which differs 

 widely from the present form in the points which we have just enumerated, and 

 which in all probability belongs to the genus Holopella. 



From Loxonema sinuosum, Sowerby sp., 2 the present species is easily distin- 

 guished by its much broader whorls and straighter ridges, which meet at a 

 definite angle at the suture instead of forming continuous sinuations across the 

 whorls. That shell was originally described by Sowerby from the Aymestry 

 Rock, and is, as I believe, correctly identified by Phillips 3 from South Petherwyn. 

 A beautiful example of it from the latter locality is in the British Museum, which 

 shows admirably the sinuous character of the striae, and proves that M'Coy was 

 wrong in supposing the L. sinuosum of Phillips to be the same as L. nexile. 



L. obliquiarcuatum,, Sandberger, 4 approaches our shell very nearly, but is a 

 decidedly shorter shell with narrower whorls, and has coarser ridges. 



L. costatum, Goldfuss sp., MS., as described by Sandberger, 5 is much shorter, 

 has much narrower whorls, and is much more obliquely striated. 



L. angulosum., F. A. Romer, 6 differs in being much shorter and having much 

 fewer and less arched strise. 



L. funatum, F. A. Romer, 7 has much coarser striae with a different curvature, 

 forming a reversed " S " with a very small upper lobe. 



In Turritella lineata, Minister, 8 the whorls are decidedly broader and the 



1 1840, Sowerby, ' Geol. Trans.,' ser. 2, vol. v, pt. 3, pi. lvii, fig. 22 ; and 1841, Phillips, ' Pal. 

 Foss.,' p. 99, pi. xxxviii, fig. 184. 



2 1837, Sowerby, in Murchison's ' Sil. Svst.,' p. 619, pi. viii, fig. 15. 



3 1841, Phillips, 'Pal. Foss.,' p. 99, pi. xxxviii, fig. 182. 



* 1853, Sandberger, 'Verst. Ehein. Nassau,' p. 231, pi. xxvi, figs. 12, 12 a. 



5 Ibid., p. 230, pi. xxvi, figs. 11, 11 a. 



6 1850, F. A. Eomer, 'Beitr.,' pt. 1, p. 3, pi. i, fig. 5. 



7 1855, ibid., pt. 3, p. 14, pi. iii, fig. 18. 



8 1840, Minister, ' Beitr.,' pt. 3, p. 89, pi. xv, figs. 21 a, b. 



