14 



LiNGULA LUCRETIA. (N. sp.) 

 Fig. 3. 



Description. — Shell small, sub-pentagonal or sub-ovate, apparently 

 much compressed, or only very slightly convex ; the beak of what seems to 

 be the ventral valve is somewhat acute or minutely rounded. From 

 the beak the sides diverge at an angle of 90°, or a little more, for about 

 one-fourth or one-third the length of the shell ; then they become sub- 

 parallel and gently convex until near the anterior angles ; the latter 

 are obtusely rounded ; the front margin is very slightly convex, or 

 nearly straight for about one-third the width in the middle. The dorsal 

 valve is of the same form as the ventral, but with the beak more obtuse. 



Surface with a number of concentric undulations of growth, of 

 which there are about ten or twelve upon a specimen four lines in length. 

 Upon these, and in the hollows between them, there is a finer set, 

 resembling sub-angular striae, about twelve in the width of one line. These 

 become more crowded together, on approaching the cardinal slope, in the 

 rostral third of the shell. A few obscure longitudinal radiating lines 

 can be seen on one of the specimens. The shell is thin, and of a brownish 

 horn color with lighter concentric bands, not uniformly distributed. 

 Length about four lines ; width about three. 



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

 No. 5. Passage beds. 



Collector. — Sir W. E. Logan. 



LiNGULA Artemis. (N. sp.) 



Fig. 4. 



Description. — Shell small, elongate, ovate ; sides sub-parallel, gently 

 convex ; front margin uniformly rounded ; apex sub-acute or acutely 

 rounded ; cardinal margins diverging at an angle of about 90°, for about 

 one-third the length, gently convex ; surface with fine concentric wrinkles 

 or striae ; length, three fines ; width, two fines. 



This species is very closely alfied to L. Lucretia^ but is a narrower and 

 proportionally more elongate form. Material may yet be found to connect 

 the two, but for the present I shafi keep them separate. 



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

 No. 5. Passage beds. 



Collector. — Sir W. E. Lo^ran. 



