26 



probably containing some carbonate of iron ; there is some fine felsite 

 sand, and minute spangles of white mica. 



Fossils 



Acrothyra proavia-prima. . . . ventrals 7, dorsals 10 



Acrothele abavia " 4 " 1 



Obolus Bretonensis " 1 " 



Lingulella sp " 1 " 



Leptobolus sp " " 1 



Fossils of ASSISE b. Purplish-gray shale with much diffused hematite, the 



rock giving a purplish-gray streak ; quite minute spangles of white 

 mica are present. The fossils of this layer are much corroded, and do 

 not show good surfaces. 



Fossils 



Acrothele abavia ventrals 12 dorsals 21 



A -avia? " 1 " 1 



Obolus lens young 2, " 4 " 3 



Leptobolus atavus (long). . " 5 " 7 



Trilobite, sp. ........ a pleura with a deep furrow 1 



Of Assise c. ASSISE c. The rock in which these fossils are embedded is a purplish- 

 gray shale, with considerable diffused hematite and small spangles of 

 silvery mica. The fossils are badly corroded, and the Leptoboli in 

 consequence of the thinness of their shells are much distorted. 



Fossils 



Acrotreta, sp ventral 0, dorsal 1 



Actrothele abavia (on slab) .... " 4, dorsal 4 



Leptobolus collicia " 13 15 



Lingulella, sp " 1 



Of Assise d. ASSISE d. The rock containing the fossils is a gray and purplish- 

 gray shale, with very minute spangles of gray mica. Obolus Breton- 

 ensis is near the bottom of this assise. 



Fossils 



Acrothele avia ventral 5, dorsal 7 



Obolus Bretonensis.. . . young, 1, " 6, " 4 



Leptobolus atavus "32, " 33 



Bradorona spectator-sequat right v. 1, left v. 2. 



