TEMNODISCUS SALOPIENSIS. 51 



It is undoubtedly the case that this shell should be referred to the genus 

 Temnodiscus, and it is allied to the Swedish species T. pharetra and 7'. arrosus 

 (Lindstr.). 1 



Ferussac and D'Orbigny 2 gave the following specific diagnosis of B. murchisoni, 

 which was proposed by them for the pre-occupied name striatus : " Coquille 

 ovale, comprimee, finement striee en travers avec quelques lignes d'acroissement 

 sur les cotes, formant des stries en sautoir sur la partie dorsale, qui est un pen 

 carenee. Spire croissant tres rapidement, visible en entier dans l'ombilie. Bouche 

 triangulaire, un peu cordiforme. La moule est presque lisse." Both the Devonian 

 of Weissenbach and the Silurian localities in England quoted by Murchison are 

 given for its occurrence, for D'Archiac and de Verneuil 3 recorded it from the 

 Devonian of Weissenbach. The form from the Devonian of Argentina which 

 Kayser 1 ' considered to be allied to B. murchisoni is placed by Knod"' in his new 

 species B. globosus which typically occurs in the Devonian of Bolivia. Holzapfel 6 

 points out that Sowerby's specific name B. striatus was pre-occupied by an 

 Upper Devonian species named by Bronn in 1835, and restricts it to the latter. 



4. Temnodiscus salopiensis, sp. nov. Plate IX, tig. 10. 



Specific Characters. — Shell high, narrow, compressed, cornuate, composed of 

 1 — 1} whorls not in contact; umbilicus open, perforated, the proximal end of shell 

 nearly touching the distal portion near mouth. Whorl lanceolate in cross- 

 section, higher than wide, rapidly increasing in size; sides rounded, slightly 

 inflated; dorsum narrow, with high, narrow, suddenly elevated and compressed 

 keel bearing slit-band. Mouth simple (?), not expanded. Surface of whorls with 

 sides crossed by strong narrow transverse ribs, nearly straight, mostly equi- 

 distant, sloping a little back to meet keel nearly at right angles, then bending 

 back more strongly to cross it obliquely as thick, distant lunulas swelling out into 

 small nodes so as to give a serrated aspect to the keel. Interspaces between ribs 

 smooth. 



Dimension* [(1. 17500]. — Height of shell, 1 2"0 mm.; width of whorl near 

 mouth, 4'5 mm. ; height of whorl near mouth, (5'5 mm. 



Horizon. — Wenlock Limestone. 



Locality. — Shropshire. 



1 Ibid., p. 83, pi. vi, tigs. 52, 53. 



2 Ferussac and D'Orbigny, ' Hist. Nat. Ceph.' (1835—1848), vol. i, p. 210, pi. vii, figs. 1—3. 



'■'• D'Archiac and De Verneuil, 'Trans. Geol. Soc. Lond.' [2], vol. vi (1842), p. 210. pi. xxviii, 

 figs. 7, 8. 



* Kayser, ' Zeitschr. deutscli. geol. Gresell.,' Bd. xlix (1897), p. 287, t. x, fig. 9. 



5 Knod, ' Neues Jahrb. i. Miner. G-eol.,' Beil. Bd. xxv (1908), p. 503, pi. xxii, figs. 1, 2. 



Holzapfel, 'Abb. k. preuss. geol. Landesanst.,' n.f. Heft xvi (1895), p. 208. 



