386 THE CAMBRIAN HORIZONS OF COMLET. [vol. lxxvi, 



Helcionella rugosa Hall, var. comleyeusis nov., X 4, see p. 365 ; 

 horizons Acj & Ac.,. 



Fig. 40. Type-specimen, lateral and summit views [1897]. 



Latouchella costata, gen. et sp. nov., see p. 366 ; horizons Ac, & Ac 5 . 



Fig. 41. Type-specimen [in the collection of the Eev. W. M. D. La Touche]. 

 internal cast, X 5, Ac.,. 

 42. Second specimen, exterior, lateral & summit views, X 2 [2682]. Ac-. 



Latouchella (?) striata, sp. nov., X 2, see p. 367 ; horizon Ac 5 . 



Fig. 43. Type-specimen, lateral and terminal views [2655]. 



44. Another specimen, lateral, summit, and terminal views [2659]. 



Salterella (?) striata, sp. nov., X 6, p. 361 ; horizon Ac 3 . 



Fig. 45. Type-specimen, lateral view and outline of aperture [139]. 



TBy misadventure this figure has been reversed in position, 

 giving the appearance of a concave instead of a convex object.] 



Leperditia lentiformis, sp. nov., X 2, see p. 367 ; horizon Ac 2 . 



Fig. 46. Type-specimen [51 in the Birmingham Museum], two valves in 

 position ; a, left side ; b, dorsal aspect; c, surface X 6. 



Escasona (?) spp. indet., X 6, see p. 368 ; horizon Ac.,. 



Fig. 47. [EE 1332], with profile outlines. 

 48. [RE 1335], with do. do. 



