346 Professor T. Rupert Jones — 



Beyrichia tuherctclata, Salter, in Siluria, 1854, p. 234, woodcut 45,4 (1867, 



woodcut 64,4). 

 B. Kloedeni (with granulated surface), Jones, Ann. N. H. 1855, ser. 2, vol. xvi. 



p. 166, pi. 6, fig. 9. 



III. Other varieties : — 



B. Kloedeni, var. antiquata, Jones, Ann. N. H. loc. cit. fig. 8 ; Pal. Biv. Ent. 



Geol. Assoc. 1869, pp. 12 and 14, fig. 7. 

 „ var. pauperata, Jones, Geol. Assoc. 1869, pp. 12 and 14, fig. 8. 



J, ,, intermedia, Jones, Ibid. fig. 9. 



,, ,, subtorosa, Jones, Ibid. fig. 10. 



,, ,, torosa, Jones, A.N.H. I.e. figs. 10 and 11, 12 (?) ; Geol. Assoc. 



i.e. fig. 11. 



14. Beykichia Colwallensis, Holl, MS. Plate X. Figs. 14a, 146. 

 Length, -g-y of an inch. 



Carapace semi-cordate ; length nearly twice the depth. Dorsal 

 margin straight ; ventral margin obliquely curved ; anterior ex- 

 tremity pointed ; posterior extremity obliquely rounded. A sharp 

 keel extends from the anterior extremity round the ventral margin 

 to the posterior dorsal angle ; and parallel to the keel, and at a 

 short distance from it, there is a sharp rim, which extends from one 

 dorsal angle to the other. Between this rim and the keel there is 

 a narrow groove, which is broadest at the postero-ventral curve, and 

 narrows towards each angle. The lateral surfaces are divided mid- 

 way between the two extremities by a broad, rather shallow, sulcus, 

 which extends from near the dorsal line half-way across the valve, 

 and is bordered on either side by an oval lobe ; the ventral ex- 

 tremities of which are connected by a curved ridge, forming a horse- 

 shoe-shaped elevation, from which the sides slope gradually towards 

 the marginal rim. 



Length, xffo ; depth, tMo of an inch. 



Only two examples of this species have been met with: the one 

 that is figured, and a small (young) individual, having the same 

 characters. 



B. Cohoallensis was found by Dr. H. B. Holl, F.CSr.S., in the shaley 

 bands interstratified with the Woolhope Limestone in a quarry below 

 the Wych, Malvern, in the hamlet and parish of Col wall, whence the 

 name of this new species. 



EXPLANATION OF PLATES IX. and X. 



PLATE IX. (Figs. 1-5 are from the Middle-Devonian Limestone of Lumniaton, 



near Torquay.) 



Fig. 1. — Ci/prosina Whidbornei, Jones, nov. Eight valve. Magnified 2 diameters. 

 The antero-dorsal edge, including the beak, is broken in the original 

 and not fully restored in the figures 1« and lb. The little nick at the 

 posterior end, caused by a slight crush, was at first mistaken for the 

 remains of a beak. 



a. Lateral ; *. dorsal ; e. posterior view. The little nick here is a fracture, 

 not the trace of a beak. 

 ,, 2.— C. Whidbornei, Jones, nov. Anterior moiety of a left valve, with beak and 

 muscle-spot well preserved. Natural size. 



a. Lateral : b. anterior view. 



