14 
MIDDLE CAMBRIAN, 


Case and 
Column of 
Drawers. 
Reference to McCoy’s 
Synopsis: and Figures of Genera. 
Names and References; Observations, &c. 
Localities and Numbers. 

Gh 
Gh 

Gh 
Gh 
case 





Lingulella ———, sp. 
Kutorgina cingulata, Billings (Davids. Sil. 
Brach. pl. 4, figs. 17—19). Obolella Phillipsi, 
Holl. (Quart. Geol. Journ. Vol. xxr. p. 10, 
fig. 10 a,b). A very unusual shape for the 
genus, one valve nearly flat, and with a 
straight hinge-line: the smaller valve convex. 
Obolella Salteri, Holl. (1. c. fig. 9). A small 
and rounded species, like those of Canada 
(Davids. Sil. Brach. t. 4, figs. 28, 29). 
Obolella 

, Sp. 
Orthis lenticularis, Dalman (Salter, Mem. Geol. 
Sury. Vol. m1. pl. 4, figs. 8—10). A small 
shell seldom half an inch wide, and rather 
wider than long. The valves are both 
gently convex. The number of principal 
ribs 10 or 12, interlined by smaller ones, 
and all crossed by interrupted and rather 
wavy ridges of growth, so that the surface 
is somewhat reticulated (Atrypa lenticula- 
ris, Dalman, Spirifer lentic. Von Buch. Mr. 
Davidson has very fully figured this com- 
mon Upper Lingula flag species in his 
Monograph of the Cambrian and Silurian 
Brachiopods. Palzont. Transactions, PI. 
XXXII. fig. 22, &.). 



Dolgelly. (Mr. D. Hom- 
fray.) 
b. 808, 310, Ogof ddu, 
Criccieth. (D. H.) a. 18, 
Grits on Hollybush Hill, 
Malvern. 
a. 21, Black Shale, Mal- 
vern. (Rev. W. Symonds.) 
b. 309, Dolgelly, Penmorfa 
church. Upper Lingula 
Beds. (D. H.) 
a 265, Craig-y-dinas, Upper 
Mawddach. a. 266, Rhiw 
felyn; do. (Mr. Plant.) A 
common shell in all our 
Upper Lingula flag locali- 
ties: in N. Wales, viz. Tre- 
madoe, Criccieth, Dolgelly 
gold mines, &e. Ogof ddu, 
Criccieth. (Mr. Homfray.) 
