102 ROYAL SOCIETY OF CANADA 
LEPTOBOLUS. 
This is represented by two phyla in one of which the species 
are diminutive, tumid, long-oval, thin shelled brachiopods with the 
vascular trunks close to the margins. In the other phylum (L. 
collicia, etc.) the species are somewhat larger and the margins of the 
valves flatter. It is the first phylum which is considered here. 
VALVES OF THE SMALLER LEPTOBOLI OF THE ETCHEMIN TERRANE, SHOWING 
THE INCREASE IN SIZE FROM THEIR FIRST APPEARANCE ONWARD. 


aq < = 
+ ca © 
Assise NAME D = ae a 
—_ HM 
4 Bille EL hae 
mm mm 
Co : Beptobolusitorrentise Fr... 3° 2° 55 6: 
E. 14 Less MÉTILAVUS EE ane se male 3°8 2°4 1°6 91 
HD 214 (2) el 200 PNAS UU M DETTE Une 4°2 2°3 18 or 
E. 34 LATE AUAVUS EE des eesmeent come où 31 1:84; 17.7 
E. 3 e Miss Feet MANS A DANS ER nn Ne DE a Hee 4°8 31 15551 |) 1429 
Increase of the latest beyond the first..|........|........|........ 2°5 
LINGULEPIS. 
Under this generic name there are at least two phyla. One 
presenting small, thick shelled species, the other of larger species 
(L. Gregwa, etc.), that appeared in the principal mudbed of the Lower 
Etchemin fauna, and has not been met with higher up; for no Lingu- 
lepis is yet known in the Upper Etchemin Fauna. The phylum of 
small forms is here presented: 
VALVES OF THE SMALLER LINGULEPIDES OF THE ETCHEMIN TERRANE, SHOWING 
THE INCREASE IN SIZE FROM THEIR FIRST APPEARANCE ONWARD. 



rs 5 Sg 
Assise NAME. = SI 2.0 3 
o S ECS = 
4 EN ee < 
mm mm 
Co. Lingulepis pumila.......... A EE 6 44 1°33 27 
E.1d Taz atm b vise Gregwa-robusta............ 104 74 1°64 78.75 
E. 26 PR bi eae hea JOU PINELVIserc meee CRT sic 11 8 1:38 88° 
Increase of the latest beyond the first..|........1........|........ 3°3 

2 A full description of this and other new species of Cambrian fossils in 
these tables will be found in the writer’s Report to the Director of the Geo- 
logical Survey of Canada on the Cambrian Rocks of Cape Breton. 
