ETCHEMINIAN FAUNA OP NEWFOUNDLAND. 193 



Orthotheca pugio, n. sp. PI. II., fig. 4 a to d. 



An elongated, thick shelled species having the tube somewhat 

 flattened on the dorsal side, and arched longitudinally toward the 

 ventral side. The known part of the tube is about 27 mm. long, with 

 an orifice of 6 mm. The whole length would be about 40 mm. if the 

 shell preserved its taper and were not decollated. 



This species is like Hyolithes communis, Bill, but has no " dorsal 

 lip." From 0. DeGeeri, of the Swedish Cambrian, it differs in its 

 rounded dorsal side and granulated surface. 0. Johnstrupi, of the 

 same country, has a more slender form and different sculpturing. 



Orthotheca sica, n. sp. PI. II., figs. 5, a to e. 



This species which is of about the same size as 0. pugio, may be 

 distinguished by its smoother surface, more triangular section and 

 more distinct surface stria?. 



Mutation. PL II., figs. 6, a and b. 



This in place of a gradually rounded ventral side shows a flattening 

 of the middle quarter of that side. In this it approaches H. quadri- 

 costatus Shaler and Fcerste, of the Attleboro fauna, but is a true 

 Orthotheca, while the latter by its form is a Hyolithes. 



Orthotheca Stiletto. PI. II, figs. 3, a and b. 



A small, slender, straight species, with a very tenuous tube. It 

 has a concave dorsal side, and a rounded, convex ventral side. Rate 

 of tapering about 1 in 8. The dorsal side has fine, closely set strne 

 of growth just visible with a strong lens. 



This species is near 0. affinis, Holm, of the Paradoxides beds of 

 Sweden, but is not half the diameter and has a more elongate form. 



Orthotheca bayonet, n. sp. PI. III. fig 1 a to / 



Tube very thin and with concave slopes on three sides, two of 

 which are ventral. The dorsal side is concave in the middle and 

 convex towards the angles. Each ventral slope is convex toward the 

 middle of the ventral side and concave toward the dorsal edge. Longi- 

 tudinally the tube curves toward the ventral side, especially toward 

 the apex. 



Sculpture. — The outer surface is finely granulated, and traversed 

 by fine transverse striae 



