BIVALVIA. 12] 
Montacuta, Turton (didentata, Mont.). Shell small, thin, transverse or oblong 
‘smooth ; equivalved, inequilateral ; two cardinal teeth in each valve, the hinder one formed 
by the backward pressure of the connector. Palleal line simple. Connexus 
-cartilagious. 
Sphenalia, 8. Wood (substriata, Mont.). Shell small, thin, transverse, oblong, or 
wedge-shaped ; equivalved; very inequilateral, compressed, smooth ; hinge edentulous or 
with one obsolete tooth in each valve formed by the elevated side of the pit for the 
connector. Palleal line simple. Connexus cartilaginous. 
Crag Species. 
Lepton squamosum, Mont. Crag Moll., vol. u, p. 114, Tab. XI, fig. 8. 
— nitidum, Turt. Crag Moll., vol. ui, p. 116, Tab. XI, fig. 7. 
—  deltoideum,S. Wood. Crag Moll., vol. un, p. 115, Tab. XI, fig. 9. 
—  depressum, Nyst. Crag Moll., vol. 11, p. 116, Tab. XI, fig. 6. 
Lasea rubra, Mont. (Kellia). Crag Moll., vol. u, p. 125, Tab. XI, fig. 10. 
— pumila, 8. Wood (Kellia). Crag Moll., vol. ti, p. 124, Tab. XII, fig. 15. 
— Clarkia, Clark. Supplement, Tab. IX, fig. 10. 
— intermedia, S. Wood.’ Supplement, Tab. X, fig. 22. 
Bornia ovalis, 8S. Wood. Supplement, Tab. IX, fig. 3. 
Scacchia elliptica, Phil. (Kellia). Crag Moll., vol. 1, p. 121, Tab. XI, fig. 13. | 
—  cycladia, 8. Wood (Kellia). Crag Moll., vol. 1, p. 122, Tab. XI, fig. 4. 
—  orbicularis, 8. Wood (Kellia). Crag Moll., vol. u, p. 120, Tab. XII, fig. 9. 
Scintilla ambigua, Nyst (Kellia). Crag Moll., vol. 11, p. 120, Tab. XII, fig. 11. 
— compressa, Phil. (Kellia coarctata). Crag Moll., vol. i, p. 123, Tab. XII, 
fig. 10. 
Kellia suborbicularis, Mont. Crag Moll., vol. u, p. 119, Tab. XII, fig. 8. 
Montacuta bidentata, Mont. Crag Moll., vol. u, p. 126, Tab. XII, fig. 17. 
—  eélliptica,S. Wood. Supplement, Tab. X, fig. 21. 
— truncata, 8. Wood. Crag Moll., vol. u, p. 127, Tab. XII, fig. 16. 
—  ferruginosa, Mont. Crag Moll., vol. 1, p. 129, Tab. XI, fig. 14. 
Sphenalia substriata, Mont. (Montacuta). Crag Moll., vol. ti, p. 128, Tab. XII, 
fig. 12. 
— donacina, S. Wood (Montacuta). Crag Moll., vol. u, p. 131, Tab. XI, 
fig. 3. 
Cryptodon rotundatum, S. Wood. Crag Moll., vol. 1, p. 135, Tab. XII, fig. 19 (as 
Cryptodon ferruginosum. 
—  sinuosum, Donovan. Crag Moll., vol. ui, p. 1384, Tab. XI, fig. 20. 
* This is from Aldeby. 
