CHONETES. 157 
Wings small, flat, triangular. Surface covered with very fine, close, rounded, 
and regular microscopic radiating striz, crossed by rather numerous sub-equal 
and regular growth-lines, which become nodulous on the hinge-margin, and with 
which rows of numerous small, low, elongate, triangular tubercles more or less 
correspond. 
Size.-—Length, 23 mm.; width, 26 mm.; depth, 6 mm. 
Locality.—There is a single specimen in my Collection from Lummaton. 
Remarks.—This shell differs from P. subaculeata in the possession of fine 
radiating lines, in the size and character of its tubercles, and in several other 
particulars. It seems to differ from any Devonian or Carboniferous species. 
From Productus pustulosus, Phillips,’ and P. spinulosus, Sowerby,’ it seems distin- 
guished by its smaller umbo and by the presence of radiations.  Marginifera ? 
Spitabergiana, Toula, as given by T'schernyschew,’ has a larger umbo. 
2. Genus.—Cuonetss, Fischer, 1837. 
1. CHoneres Harprensts, Phillips, sp.? Pl. XVII, figs. 18, 13 a. 
1841. Orruis Harprensis, Phillips. Pal. Foss., p. 138, pl. lvin, figs. 104*, a—d, 
and pl. Ix, fig. 104*. 
1865. Cuoneres Harprensis (pars), Davidson. Brit. Foss. Brach., vol. iii, pt. 6, 
p. 95, pl. xix, figs. 4—8 (only). 
? 1892. 7 Manirosensis, Whiteaves. Contrib. Canad. Paleont., vol. i, pt. 
4, p. 281, pl. xxxvii, figs. 1—2. 
Remarks.—Davidson gives this species in his list of Lummaton fossils. I have 
obtained from that locality a single imperfect specimen, which closely agrees with 
Phillips’s figure and description except that the rays are much more numerous. 
It is covered by fine, close, rounded, regular, concentric threads, after the manner 
of Chonetes Phillipsii ; but it shows no signs of spines, except on the hinge, where 
there appear to have been only two or three marginal spines set obliquely, and in 
this point it differs from Ch. tenwicostatus, Cihlert,* which in other respects it 
seems greatly to resemble. 
A comparison of specimens makes me think it distinct from the species of 
Chonetes which are so common in the Pilton beds of North Devon and in the 
1 1861, Davidson, ‘ Brit. Foss. Brach.,’ vol. ii, p. 168, pl. xl, figs. 1—6, and pl. xlii, figs. 1—4 
2 1861, Davidson, ibid., p. 175, pl. xxxiv, figs. 18—21. 
3 1889, Tschernyschew, ‘ Mém. Com. Géol.,’ vol. v, pt. iv, p. 286, pl. vil, fig. 36. 
4 1883, ‘Bull. Soc. Géol. Fr.,’ ser. 3, pl. xi, p. 515; pl. iv, figs. 2—2 d. 
