120 CRETACEOUS LAMBLLIBRANCHIA. 



? 1868. Spondtlus striatus, E. Eichwald. Lethsea Eossica, yoI. ii, p. 422. 

 1870. — —F.J. Pidet and G. Campiche. Foss. Terr. Crt't. Ste. 



Croix (Mater. Pal. Suisse, ser. 5), p. 261. 

 1872. — — H. B. Geinitz. Das Elbthalgeb. in Sachsen (Palse- 



ontographica, vol. xx), pt. 1, 

 p. 186, pi. xlii, figs. 1 — 3. 

 ? 1877. — —A. Frifsch. Stud, ini Gebiete der biJhm. Kreidef. : II, 



Die Weissenberg. u. Maluitz. Sehicht., p. 138. 

 1878. — — ■ G. Behrens. Zeitsclir. d. deutsch. geol. Gesellsch., 



vol. XXX, p. 259. 

 1893. — — B. Michael. Ibid., vol. xlv, p. 237. 



1895. — — E. Tiessen. Ibid., vol. xlvii, p. 475. 



1897. — — E. Leonhard. Die Kreidef. in Oberscbles. (Palaeon- 



tographica., vol. xliv), p. 50. 



Nou 1822. PoDOPSis striata, A. Brongniart. Descript. gcol. des Euvir. de Paris. In 



Ctivier, Ossem. foss., ed. 2, vol. ii, 

 pp. 319, 604, pi. V, fig. 3. 

 — 1870. Spondylus striatus, F. Burner. Geol. von. Oberscliles., p. 315, pi. xxxvii, 



figs. 3, 4. 



]>('srr!2)fion. — Shell large, obliquely ovate, high ; anterior and ventral margins 

 I'egularly rounded; posterior margin slightly concave or nearly straight. 



Right valve usually more inflated than the left, and generally attached by the 

 larger part of its surface ; free part with radial ribs, separated by shalloTv grooves, 

 and crossed by numerous very fine concentric lamellae. 



Left valve moderately convex, umbonal part prominent and produced ; surface 

 sometimes undulating ; ribs numerous, equal, smooth, flattened, separated by deep 

 grooves except on the later formed parts of the valve, where the grooves become 

 shallow and the ribs less distinct. The grooves and ribs are crossed by concentric 

 lamelliTS, like those on the right valve. Ears smooth except for growth-lines. 



Measurements of left valve : 



(1) (2) (3) (4) 



Length . . . . 56 52 50 40 mm. 



Height . . . . 77 65 58 48 „ 



(1 — 4) from Warminster. 



Affinities. — For the relation of this species to S. latns, Sowerby, see p. 123. 



iS. hi/strix, d'Orbigny (? Goldfuss) is distinguished from this species by the left 

 valve being less convex, the umbo less produced, the narrower and more widely 

 separated ribs, and the spines on the earlier part of the valve. 



'S'. capillatas, d'Archiac, from the Tourtia of Tournay, has been regarded by 

 (leinitz, d'Orbigny, and other authors as a synonym of >S. striatus; specimens 



