136 DEVONIAN FAUNA. 
a variety of Ih. deflewa under the name Ith. spherica in the ‘Min. Conch.,’ pre- 
viously to giving it to Mr. Hennah’s fossil. On examining Mr. Hennah’s speci- 
men I find its mineral character such that I have no doubt of the correctness of 
Davidson’s view. 
Among my Lummaton shells I have a specimen which bears considerable 
likeness to that shell, while differing very decidedly from ordinary specimens of 
fh. cuboides. There are only two other specimens in my Collection which at all 
approach it, and they are not in a sufficiently good state of preservation to be 
certainly referred to it rather than to Ih. cuboides ; but there is a good specimen 
from Wolborough in Mr. Vicary’s Collection. Two similar Devonian fossils in 
the Museum of the Geological Society are there labelled Rh. Wilsont. This 
evidence, however, appears too slight for introducing a Silurian name into the 
Devonian lists. 
Eh. nucleolata, Hall,‘ bears considerable resemblance to it, but the fold is 
somewhat deeper or more advanced in profile. On the other hand, Lh. venustula, 
Hall, which Clarke’ calls the American variety of Rh. cuboides, seems to me 
intermediate between Sowerby’s species and the present shell, though differing 
from the latter in having a smaller beak. Mons. Mhlert considers our shell 
distinct from both. 
Rh. fallaciosa, Bayle, sp.,*° as described by Céthlert,* chiefly differs in having 
sharper ribs extending to the umbones. 
Rh. sub-Wilsoni, dV Orbigny,’ which somewhat resembles it in shape, has much 
3 
more numerous ribs. 
6. Genus.—Camaropuoria, King,’ 1846. 
1. CAMAROPHORIA ASCENDENS, Steininger, sp. Pl. XV, figs. 7—9. 
1853. TEREBRATULA ASCENDENS, Steininger. Geogn. Beichr. Eifel, p. 61, pl. v, 
figs. 2—3c. 
1858. RHYNCHONELLA sUBCUBOIDES, Gebel (not d’Orbigny). Sil. Faun. Unter- 
harz., p. 40, pl. v, fig. 7. 
1878. — == Kayser. Abhandl. Geol. Specialk. Preuss., 
vol. ii, pt. 4, p. 155, pl. xxvi, 
fig. 14. 
1 1861, Hall, ‘Pal. N. Y.,’ vol. iii, p. 226, pl. xxxi, figs. la—f, 2a—y. 
2 1884, Clarke, ‘Neues Jahrb. f. Min.,’ Beil.-Band iii, p. 385. 
8 1878, Bayle, ‘ Expl. cart. Geol.,’ pl. xiii, figs. 13—16. 
4 1884, Chlert, ‘ Bull. Soc. Géol. Fr.,’ ser. 3, vol. xii, p. 420, pl. xviii, figs. 5 a—o. 
5 1847, d’Orbigny, ‘ Prodrome,’ vol. i, p. 92; and 1884, ihlert, ‘Bull. Soc. Géol. Fr., ser. 3, 
vol. xii, p. 427, pl. xxi, figs. 1—1s. 
6 Not Stenoschisma according to Waagen, ‘Mem. Geol. Surv. India,’ ser. 13, vol. i, p. 485, 1887. 
