EXPLANATION OF THE PLATES AND WOOD-CUTS. 



Fig, 10. Ammonites arthriticus. Discoid, thick, with convex whorls and a rounded 

 margin, tuberculated and ribbed; whorls half-exposed, about 4, their inner 

 margin smooth ; tubercles large, near the middle of the sides of the whorls, about 

 12 in each whorl ; ribs prominent, rounded, 3 or 4 from each tubercle and some- 

 times an intermediate one ; aperture nearly circular, completed 3 or 4 times in 

 each whorl with a thickened edge. Diameter 2\ inches, thickness 1 inch. Fio-ured 

 of the natural size. 

 Loo. near Charee. 



Fig. 11. Ammonites ignobilis. Discoid, depressed, umbiHcated, keeled, radiated ; front 

 rounded with a slightly prominent entire keel ; umbilicus small, with squarish 

 edges, exposing a small portion of the inner whorls ; radii covering half the whorl, 

 in pairs or forked, commencing and terminating with obscure tubercles, waved ; 

 aperture sagittate, narrow. Diameter nearly 3 inches, thickness 10 lines. Length 

 of the aperture \\ inch. Drawn of the natural size. 

 Loc. near Charee. 



Fig. \2. Ammonites corrugatus (M. C. t. 451, f. 3.) ? An imperfect specimen, rather 

 more strongly ribbed than the one figured in Mineral Conchology. Drawn of the 

 natural size. 



Loc. near Charee. 



Fig. 13. Ammonites Armiger. Discoid, inner volutions exposed ; inner whorls radiated 

 and furnished with a row of tubercles on their sides ; outer whorl with a row of 

 tubercles near the inner edge, and a row of spines near the outer edge on each 

 side, — the tubercles and spines connected by thick ribs ; margin flat ; aperture 

 oblong, squarish. Diameter 7 inches. The figure is reduced one-half. 



Strongly resembling A. perarmatus (M. C. t. 352.), but the whorls increase more 

 rapidly in size, and the aperture is longer. Probably A. Catena, A. perarmatus, 

 and this are only varieties of one species. 

 Loc. near Charee. 



Fig. 14, 15, 16. Crinoidal stems, apparently of 3 species. 

 Loc. near Charee. 



Plate XXIV. 



(Fossils from the Nummulitic Limestone and Marl, Cutch, p. 300.) 



Fig. 1. Cardium intermedium. This shell, of which we have only casts, is very near in 

 form to Cardita intermedia of Lamarck ; the hinge, as we learn from the impression, 

 however, wants the long marginal tooth, which marks the genus Cardita. Length 

 I inch, width the same. 

 Loc. Baboa Hill. 



Fig. 2. Cardium ambiguum. The furrows upon the surface of this cast are deeper 

 than they would be in a cast from the European C serratum ; which, in the general 

 form of the shell and number of furrows it resembles more strongly than it does 

 the C IcEvigatum of the Indian Seas. Length 2 inches 1 line, width 1 inch 10 

 lines. Drawn two-thirds of the natural size. 

 Loc. Baboa Hill. 



