604 



FOSSIL SHELLS OF THE OLD RED SANDSTONE. 



Turritella conica, f. 7 b and 8. Conical, pointed, smooth, whorls 6, convex, rather angular ; length 



4^ lines, width 2 lines. Not so frequent as T. gregaria. 



Loc. Hot eh Chapel. Felindre. 

 Orthoceras semipartitum, f. 9 a. Very slightly tapering, smooth ; septa rather close, concave ; 



siphuncle nearly central, connected with the side by a longitudinal plait ; diameter 3 lines. 



A small species ; the plate which connects the siphuncle with the side forms a fissure in the 



cast of each chamber. 



Loc. Horeb Chapel. Felindre. 

 Orthoceras ?, f. 12 h. Smooth; septa rather distant; siphon central, large. Specimen 



too imperfect to name. 



Loc. Horeb Chapel. 

 * Orthoceras striatum. (See PI. 5. f. 29.) Also in the Upper Ludlow Rock. 



Loc. Horeb Chapel. 



Orthoceras tracheale, f. 9 b. Very slightly tapering, finely striated transversely ; covered with 

 obtuse, annular undulations ; septa rather flat; diameter 4 lines. 

 Loc. Horeb Chapel. 



Bellerophon. carinatus, f . 4 and 1 d. Convoluted, compressed, keeled, smooth ; inner whorls se- 

 veral, small, partly visible ; aperture an equilateral triangle. 

 Loc. Horeb Chapel. 



Better ophon striatus, f. 12 e. Carinated, covered with sharp striae parallel to the edge of the 

 aperture ; apex (spire ?) very small, convoluted ; aperture cordate (with a narrow deep sinus in 

 the front ?) ; keel flattened at the edge and transversely striated; length 6 lines, breadth 5 lines. 

 Loc. Felindre. 



Better ophon trilobatus, f. 16. Convoluted, smooth, 3 lobed, central lobe largest; inner whorls 



small, visible; aperture above twice as wide as long; length and breadth 4 lines. 



Loc. Felindre. Is the same species in the Caradoc Sandstone at Eastnor Park ; north-east 

 of Gaerfawr, Frescoed Common $ and Michaehvood Chace, Tortioorth? 

 Bellerophon globatus, f. 15. (See PI. 4. f. 50.) Globose, smooth; aperture transversely oblong, 



with a small sinus ; width about 4 lines. 



Loc. Felindre ; also in the Upper Ludlow bone bed. 

 *Tentaculites scalaris} Schlotheim. Also throughout the Silurian series. (See Caradoc sandstone, 



PL 19. f. 15.) 



Loc, Horeb Chapel. Felindre. 



Crustacea. 



Agnostus tuber culaius, f. l'J. (Battus tuberculatus, Kloden. Verstein der Mark. Brandenb. } p. 112. 

 t. 1. f. 16, 17 and 18.) Semi-circular, smooth ; lobes three, equal, the central one undivided, 

 LiOc. Lodge Bank, Downton. 



