15 



Crania bella. (N. sp.) 



Fig. 5. 



Description. — Of this species we have two valves lying close together 

 -on the same piece of stone, and thus appear to belong to the same indivi- 

 dual. The one figured is sub-conical, the apex about in the centre and 

 slightly incurved towards one side. This side of the shell has a concave 

 slope from the apex to the margin, but the opposite side presents a gently 

 convex descent. The other valve is gently convex, nearly flat, with the 

 p ex close to one margin. Surface with between thirty and forty concen- 

 tric striae, with also some obscure undulations. Width about five lines. 



Locality and Formation. — Gaspe, Cape Bon Ami. Gaspe limestone 

 No. 5. Passage beds. 



Collector. — Sir W. E. Logan. 



Chonetes Melonica. (N. sp.) 



Fig. 6. 



Fig. Cj— Chonetes Melonica, a. 6., two specimens showing remains of spines ; c, portion of 

 the area of the ventral valve enlarged ; d area natural size. 



Description. — Shell of medium size, usually about ten or twelve lines 

 wide ; length between one half and two-thirds the width ; hinge line equal 

 to the greatest width of the shell ; cardinal angles usually 90^^, often a 

 little less or more ; all the front two-thirds of the shell uniformly rounded, 

 sometimes with the front margin only very gently convex. Ventral valve 

 usually strongly convex and often extremely gibbous, always more or less 

 flattened towards the cardinal angles ; area rather narrow, sometimes lying 

 in the plane of the lateral margin, but more often, owing to the strong cur- 

 vature of the upper part of the valve, partially inverted ; foramen a little 

 wider than high, closed by a convex deltidium ; lower edge of the area in 

 detached valves crenulated or serrated with small teeth, of which there 

 are six or seven in one line ; these teeth not visible when both valves are 

 united ; when the shell is well preserved and semi-translucent, faint, dark 



