458 Canadian Record of Science. 



or pits near the hinge which characterize that genus ; nor 

 is the slope from the hinge so long. Though tumid in the 

 upper third of the valve this form cannot be classed with 

 Schmidtella, because the slope in the upper third of the 

 valve is not bent down abruptly to the hinge, as in that 

 genus ; and furthermore the outline of the valve is that of. 

 Beyrichona and Bradorona, and not the round valve of 

 Schmidtella. I refer to this genus Beyrichona ovata of the 

 Protolenus fauna. The typical characters of the genus 

 are in the following species, E. rutellum. 



ESCASONA RUTELLUM, n. sp. PI. figS. O a tO C. 



A broad tumid species. Hinge two-thirds of the width 

 of the valve. Anterior cardinal curve obsolete ; posterior 

 one half of the length of the hinge, anterior marginal 

 curve long, arched ; posterior shorter, nearly straight, 

 lower end of the valve obtusely pointed. 



Highest point of the valve one-third from the hinge and 

 two-fifths from the posterior margin. The ocular tubercle 

 is small, close to the hinge and some distance from the 

 anterior end. The posterior slope of the valve is flattened. 

 The cardinal slope of the surface of the valve has a broad 

 shallow furrow extending down nearly to the highest part 

 of the valve. The arched anterior sloped surface of the 

 valve is evenly curved down to the border. 



Sculpture. — The surface of the shell has been corroded, 

 and the pitted surface is obscure. 



Size. — Length, 3 mm; width, 3f mm; depth, Ih mm. 



Horizon and Locality. — Assise E. 3 f., Upper Etche- 

 minian, at Gillis' Indian Brook. Scarce. 



EscASONA (?) VETUS, n. sp. PI. IL, figs. 6 a and h. 



This form, represented by a right (?) valve, has a more 

 rounded surface than the type, and the valve is flatter. No 

 ocular tubercle is determinable. The hinge line is very 

 long (sixth-sevenths of length) and there is a shallow 



