172 PERMIAN FOSSILS. , 
ByssoARCA STRIATA, Schlotheim. Plate XV, figs. 7, 8, 9. 
Myriuites striatus, Schl. Minch. Akad., vol. vi, p. 31, pl. vi, fig..3 a, 6, ce, 1816. 
— — »  Petrefactenkunde, p. 298, 1820. 
as —_— »  Boué, Edin. Phil. Journal, vol. xii, p. 144, 1825. 
CucuLLma, N.S8., Phillips. Phil. Mag., vol. iv, p. 401, 1828. 
= suLtcaTA, J. de C. Sow. Trans. Geol. Soc. Lond., 2d series, vol. iii, p. 119, 
1829. 
== == 3 De la Beche, Geol. Man., p. 384, 1831; Germ. 
Transl., p. 459, 1832 ; 3d Eng. ed., p. 573, 1833. 
Mytiuvs striatus, Schl. Op. cit., Germ. Transl,, p. 459, 1832; 3d Eng. ed., p. 573, 
1833. 
— — » Phillips, Encye. Met., vol. iv, p. 616, 1834. 
CucuLLMA suLcATA, J. de C, Sow. Loc. cit. 
— — BS Thomson, Outlines of Geology, &c., vol. ii, p. 314, 
1836. 
ARcA ANTIQUA, Mister. Goldfuss, Petrefacta, 2d part, p. 145, pl. 122, fig. 8. 
Cucttima sutcata, J. de C. Sow. Morris, Catalogue, p. 85, 1843. 
ARCA ANTIQUA, Minster. Geinitz, Geea von Sachsen, p. 95, 1843, 
23 — na De Verneuil, Bull. Soc. Géol. de France, 2™° série, vol. i, p. 32, 
1844. 
= —_ s Geol. Russ., vol. 1, p. 224, 1845. 
Byssoarca TuMIDA, J. de C. Sow. (partim). King, Catalogue, p. 11, 1848. 
Arca Lorrustana, Howse. Trans. T. N. F, C., vol. i, pp. 246, 247, 1848. 
(?) — tumipa, J. de C. Sow. Geinitz, Versteinerungen, p. 9, pl. iv, fig. 7, 1849. 
Diagnosis.—“ Shell ovato-trapezoidal, ventricose, the umbones intermedian and 
distant, the underside sub-compressedly declining, marked with numerous radiating, 
closely-set, furcated, granulated lines.”* (Miinster-) 
This species, which has been variously named by Schlotheim, J. de C. Sowerby, 
and Miinster, was considered in my ‘ Catalogue’ as a variety of Byssoarca tumida,—the 
fossil next to be considered. It is certainly the Cucullea sulcata of J. de C. Sowerby ; 
as I have seen a specimen thus named in the collection of this gentleman. 
Those who contend for its distinctiveness, compared with Ayssoarca tumida, may 
dwell on its greater width, more approximate umbones, and less rounded ventral 
margins; it cannot be denied, however, that specimens occur apparently militating 
against their being specifically separated. 
The specimen represented by Count Minster, in the ‘ Petrefacta,’ has the ribs slender, 
divided toward the ventral margins, and finely granulated or nodulous ; but specimens 
occurring at Humbleton and Tunstall Hills have generally the ribs simple, somewhat 
stronger, and rather more coarsely nodulous. 
This species has only anterior and posterior teeth, which are nearly parallel to the 
1 « Area testa ovato-trapezoidea ventricosa, umbonibus antemedianis et distantibus, latere postico sub- 
compresso-declivi, lineis radiantibus crebris confertis furcatus granulatis.”’ (Goldfuss’s Petrefacta, 2d part, 
p. 145, 
