PRODUCTELLA. 155 
1885. Propuctrus suBpacuLEaTus, Maurer. Abhandl. Grossh. Hessisch. Geol. 
Landes, vol. i, pt. 2, p. 182, pl. v, 
fig. 1. 
1886. —_ _— Wenjukof. Fauna Dev. Syst. N.W., und 
Central Russl., p. 457, pl. ii, fig. 7. 
1891. PropvcTEeLta sprnuticosta, Whiteaves. Contrib. Canad. Pal., vol.i, pt. 3, 
p- 217, pl. xxix, figs. 3, 3 a, and 
pl. xxxi, fig. 1. 
1891. — SUBACULEATA, var. CATARACTA, Whiteaves. Ibid., p. 217. 
1892. _— _— Whiteaves. Contrib. Canad. Pal., vol. i, pt. 4, 
p- 283. 
Localities.—There are about thirty specimens in my Collection, and three in the 
Woodwardian Museum, from Lummaton, and about ten in the Torquay Museum, 
probably from the same locality. From Wolborough there are fourteen fine 
specimens in Mr. Vicary’s Collection, one in mine, three in the Museum of 
Practical Geology, three in the British Museum, and one in the Bristol Museum. 
Remarks.—This seems a very variable species, both as to width, convexity, 
and the number of its tubercles. The side of the shell under the hinge seems 
frequently, but not always, swollen into a kind of wing. The largest specimens 
are generally the most transverse, young shells being sub-orbicular, and frequently 
as convex as the full-grown shells. The tubercles are small and often few upon 
the younger shells. The beak sometimes is very depressed, and sometimes 
overhangs the hinge. 
There are several small American shells which are very difficult to distinguish 
from small forms of the present species. P. spinulicosta may perhaps be separated 
by its strong concentric ridges, and may come nearer to Strophalosia productoides. 
P. truncata seems only separable by its small size and constant attachment by the 
substance of the beak. It may perhaps really be the fry of a larger species, 
especially as it is described as gregarious. 
The shell given by Whiteaves as P. spinulicosta seems to me exactly like the 
Devonshire form. 
2. PRODUCTELLA FRAGARINA, n. sp. Pl. XVII, figs. 10, 11, lla, 110. 
1840. Lepr@na FRaGaRIA (young ?), Sowerby. Geol. Trans., ser. 2, vol. v, pt. 3, 
pl. lvi, fig. 6 (only). 
1865. SrropHatosta PRoDUCTOIDES, Davidson (pars). Brit. Foss. Brach., vol. iii, 
p- 97, pl. xix, figs. 17—17 ¢ (only). 
Description.—Shell convex, rather longer than wide. Ventral valve convex in 
the centre, spreading out flatly on the wings. Beak prominent, rounded, narrow 
