Fossils of the Calciferous Sandrock, 357 



these large carinas with numerous coarse longitudinal striae follow- 

 ing the whorls to the apex. The lower and outer side of the 

 whorls are regularly convex, and the umbilicus one third of the 

 width of the whole shell. 



This species is about the size of H. uniangulata and also of H. 

 planulata, the spire a little more elevated than that of the latter, 

 while the upper surface, in addition to the two keels, is orna- 

 mented with the longitudinal spiral striae, which occur only on 

 the outer side of H. planulata, and not at all onlZ". uniangulata. 



Locality and formation. — Mingan Islands, White limestone. 



Collectors. — Sir W. E. Logan, J. Richardson. 



Maclurea matutina. ? (Hall). 



Maclurea matutina, (Hall). Paleont., N.Y., vol. 1, p. 10, 



pi. 3, fig. 3. 



Fig. 7. 



a Maclurea matutina. Lower side. 

 b Front view. 



The specimen above represented agrees in its proportions 

 very closely with those figured by Professor Hall. On referring 

 to the plate cited, it will be seen that the figure shews two im- 

 perfect specimens, a small one with two whorls, and a larger one 

 with nearly three. Ours agrees almost exactly with the smaller 

 and also with the first two whorls of the larger. I think it highly 

 probable that when good specimens can be compared, those of 

 New York will be found identical, and I shall not therefore pro_ 

 pose another name for ours. 



Locality and formation. — Mingan Islands, Calciferous sand- 

 rock. 



Collectors. — Sir W. E. Logan, J. Richardson. 



