Orbitolites Mantelll, Cart., from. Burma. 345 



for the district/' This, which is also marked on his map, is 

 less than a mile in length by half a mile broad, stated by 

 Mr. Theobald from memory to be about "400 feet high," and 

 separated from the river by a " narrow strip " of his " Newer 

 Tertiaries," about 32 miles above the town of Prome, which 

 " Tertiaries " on the other side also separate it again from the 

 main area of nummulitic strata whose vertical section is 

 especially well seen in a small stream at the village of Tham- 

 bola, about 34 miles nearly due west of the " Lime Hill," 

 and of which section, at p. 98 &c. of his Report, a detailed 

 statement is given^ condensed at p. 100 into the following 

 generahzed one : — 



feet. 



1. Nummulitic Limestone 10 



2, Shales and Sandstones ; Shales occasionally N'ummu- 



litic 658 



3. Massive Sandstone with some Shales and much soda- 



efflorescence in places 328 



4, Shales and Sandstones j the Shale with some Carbon- 



aceous markings 227 



Total 1,223 



So much for this variety of OrUtolites MantelU, and the 

 assumed geological position of the stratum charged with it, 

 which is contained in Mr. TheobakVs " Report." I have 

 now, in conclusion, to offer a few explanatory remarks on the 

 name " OrhitoUtes MantelU " which I adopted in 1853 (Journ. 

 Bombay Asiatic Society, vol. v. p. 138), as my kind friend 

 the late Dr. Carpenter, in his excellent ' Introduction to the 

 Study of the Foraminifera ' of 1862, p. 298, considered it, 

 viz. the term " OrhitoUtes^'' to have been adopted on 

 " fallacious grounds." 



In 1834, S. G. Morton (Synopsis of the Organic Remains 

 of the Cretaceous Group. 8°. Philadelphia, U.S.) mentioned 

 the occurrence, in the Claiborne Beds of Alabama, of a 

 discoid fossil which he called NummuUtes MantelU \ and 13 

 years afterwards, viz. in 1847, D^Orbigny (* Cours de 

 Geologic,! vol. i. p. 194, and 'Prodrome,' 1850, vol. ii. 

 p. 406, respectively) used the name '•'■ Orhitoides " for this and 

 similar fossils under the following diagnosis, accompanied in 

 the preceding page by a typical illustration : — 



'^ Coquille discoi'dale, convexe des deux cotes, formee d'une 

 seule rangee de loges autour du disque, tr^s fortement 

 encrotlte ext^rieurement au milieu, et montrant soit des 

 lineoles rayonnantes, soit des granulations '"' (Cours, vol. i. 

 p. 194). Thus he includes under this generic heading not 

 only the Alabama fossil (Prodrome, vol. ii. p. 408), but 



