114 MEMORANDUM ON THE HIMALAYAN FOSSIL SHELLS. 



in that genus, but at the beak is a large angular sinus, with what appears to have been 

 an operculum, and ligament protruding — Spirifer ? 



2dly. Terebratulites, the same as the others, and at least two new varieties — both of 

 the plaited kind. 



3dl3\ Repetitions of the Bivalve, I have before spoken of under the third head. 



4thly. Another impression of the same patelliform shell, as before mentioned. 



5thly. Three broken pieces of a Bivalve shell, greatly resembling the Inoceramus, 

 for which I beg to refer to the plates in CuviER. 



6thly. Two casts of Spiral Univalves, which appear to be Cirrus and Helix. The 

 first may be compared with a Cirrus from the chalk, and another from tlie Oolite forma- 

 tion in Mr. Calder's collection, so. that no doubt can well be entertained as to the name. — 

 The one I have called Helix resembles the elongated variety, which is called Helix 

 vivipara. It may be compared with the casts in a piece of Petworth marble, which we 

 have. But there are other genera to which it may be ascribed — perhaps Turbo, for one of 

 them. 



7thly. Two small varieties of Ammonites, both much worn, and we have nothing 

 to refer to for the specific name. One of them has the Siphuncle in a raised ridge at the 

 back. There is also an imperfect cast of another variety, which hardly differs from one 

 Ave have from Mr. Taylor, and named in his list as Ammonites Planicosta. We have 

 then here three additional genera, Cirrus, Helix, and Inoceramus (?) — besides a multi- 

 tude of broken and worn impressions of the genera before described, with many nodules 

 of what I believe to be clay ironstone; but I have not yet had time to examine them 

 sufficiently. 



Dr. Falconer has found the specific gravity of some of these nodules to be 3-00, 

 or nearly so ; one or two that we have broken, have shewn us Ammonites covered with 

 a thin coating of Pyrites. It would always be better for Collectors to split these nodules 

 as carefully as possible, when they are found, instead of sending them down whole. 



REFERENCE TO PLATES I. AND II. OF HIMALAYAN FOSSIL SHELLS. 



Figure 1. Orbulite. Fig. 2. Ammonite. Fig. 3. Ditto. Fig. 4. Orbulite. Fig. 5. Ammonite. 

 Fig. 6. Ammonite. Fig. 7. Orbulite. Fig. 8. Helix or Turbo ? This SLcli is represented rather too 

 large in the drawing. Fig. 9. Oobulite. Fig. 10. Cast of a Patelliform ShelL Fig. 11. a, b. Cirrus. 

 Fig. 12. Turrittella .' Fig. 13. Undetermined. Fig. 14—15. Orthoceratites. Fig. 16 — 17. Belemnites. 

 Fig. 18. Fragment of a Testudo. Fig. 19. Fragment of Rock, containing small mutilated Pectens 

 and other genera imbedded. Fig. 20—21. Pectens. Fig. 22—23. Produuta. Fig. 24. Terebratula. 

 Fig. 25. Spir-fer? Fig. 26. a, b, c, d, The supposed Unio. Fig. 27. Area. Fig. 28. a, b, and c, 

 Modiola. Fig. 29. Fragment of an Inoceramus ? 



