3(T4 PROCEEDINGS OF THE GEOLOGICAL, SOCIETY. 



Walpen Chine- — equivalent to about 120 feet of thickness. I have 

 given in the Table the vertical distances between the several ranges. 



VI. Scaphites Group (14, 15, 16). 



No. 14 is brown and rust-coloured moist sand, above which are 

 large concretions (15), each frequently enclosing a single Scaphite or 

 large Ammonite, as a nucleus, with other smaller fossils. The thick- 



; ness from the top of 13 to the centre of the nodules is about 18 feet. 



: The sand is itself fossiliferous, and at two or three feet below the 

 Scaphites are agglutinated clusters of Gryphcea sinuata of great size, 

 with G. IcBvigata (G. Couloni) and Terehratula Gibbsiana. 



15. The Scaphites nodules are about 18 inches to 2 feet in thick- 

 ness ; I found a specimen of S. gigas (fig. 4) in one of them ; in a 

 second range, at a short distance above, the species proved to be Sca- 

 phites Hillsii (fig. 3) ; and a third range, of uncertain species, is said to 

 occur higher up, in Whale's Chine. Large specimens in my own col- 

 lection of an Ammonite, supposed to be A. Deshayesiiy were stated to 

 have been found in this bed ; one of these is about 15 inches in diameter 

 and 3 inches thick. 



16. The interval, about 22 feet, between No. 15 and the first or 

 lowest Crioceras range No. 17, is occupied by dark grey sandy clay or 

 mud, containing near the top fine specimens of Gryphcea sinuata with 

 other fossils. 



Fossils of the Scaphites Group. 



..ibll, Pecten orbicularis. Terebratula multiformis ?, Roemer. 



r..rr. Gryphaea sinuata, Sow. Lima semisulcata ? 



Terebratula Gibbsiana, Sow. 



15. Gryphaea sinuata. Nautilus radiatus. 

 t*Scaphites gigas. Ammonites Deshavesii. 



t* Hillsii. Mantelli {d' Orb. fig. 103, not 



Anomia radiata. 104) J. 



16. Gryphaea sinuata. Terebratula sella (broad). 

 Pinna Robinaldina, d'Orh. Gibbsiana. 



r'%.. Ostrea carinata. 



VI. and VIII. Crioceras Ranges. 



The two groups in which the genus Ancyloceras of D'Orbigny has 



hitherto occurred (1 7 to 23, and 26 to 34) are separated by a thickness 



- of about 50 feet of sands and clay. The number of ranges aifording 



sexes and economy of the animals of these shells, the characters can be only 

 artificial, and the boundaries arbitrary. 



'* Scaphites gigas (fig. 4 above), (Hamites gigas of Min. Con. t. 593. fig. 2) is 

 distinguished by six tubercles on each side, in place of ribs on the straight parts. 



"Hamites grandis (Min. Con. t. 493. f. 1) has scarcely any ribs— only straight 

 portions being known to me ; but it can hardly be confounded with Ancyloceras 

 Hillsii : and I presume that it is referred to by Prof. Forbes accidentally — grandis 

 very probably being printed for gigas.'^ 



X " This Ammonite is between A. navicularisQA'uvii^iS., Geol. of Sussex, 198, t. 22. 

 f. 5) and A. Nutfieldiensis (Min. Con. 1. 108), but nearer to the former ; — and quite 

 distinct from A. Mantellii of Min. Con. 55, to which D'Orbigny has united it." — 

 {Mr. Sowerby.) 



