83 



FOSSILS OF THE ETCHEMINIAN TERRANE. 



Though remains both of Hyolithes and Orthotheca have been found at 

 several horizons in the Etcheminian terrane, only at one locality are 

 they in such a condition of preservation as to render it possible to make 

 any attempt at designating the species. 



ORTHOTHECA, Novak. 



This genus is represented at no less than five horizons of the Lower 

 Etcheminian, but in all cases the material representing the tubes of these 

 worms is so imperfectly preserved that no specific reference can be 



made - Hyolithes cf. 



tenuistriatus. 

 HYOLITHES, Eichwald. 



HYOLITHES cf. TENDISTRIATUS, Linrs., PI. IX, figs. 4a and b. 



A large species of this genus occurs in company with Lingulella 

 Selwyni in the gray sandstones of Young point, which is nearly related 

 to the above Swedish species. It also resembles the Bohemian H. 

 maximus, Barr., and the American H. princeps, Bill. 



Apical angle about 1 2. No grooves were observed within the margins 

 on the dorsal side and no furrow at the median line on the ventral side. 

 This valve is somewhat flattened on the sides but much more convex than 

 the dorsal ; on the average it is three times more convex, but the relative 

 convexity is variable. The edge of the orifice of the shell on the ventral 

 side is slightly bowed upward in the middle, and near each end is. a sinus 

 where the growth line curves downward and then upward before crossing 

 over to the dorsal side, hence the rising arch of the edge on the dorsal 

 side belongs partly to the ventral side. 



The angles between the dorsal and ventral sides are sharp, especially 

 in the apical half of the shell. The lip on the dorsal side is strongly 

 arched upward, and the surface striae correspondingly curved. 



Sculpture. On both sides are distinct transverse striae, but no longi- 

 tudinal striae. The inner surface of the shell is smooth and does not 

 show growth lines. 



Size of the tube. Width at the aperture 14 mm. Shorter diameter 

 at aperture 8 mm. Length of tube supposed to be about 50 mm. 

 The lip projects above the tube about 5 mm. 



Horizon and locality. jAssise E. 2 (a ?) at Young point near George 

 rivef station, N.S. 



6i c. R. 



