235 



uniformly ventricose. The surface, when perfect, of M. 

 covered with fine thread-like strige, distinctly visible on the band (which 

 is on the middle of the whorls), and never (in any of the specimens that I 

 have seen) undulated. 



M. arenaria, of the Calciferous, is more closely allied, but appears to 

 me to be a different species, being much shorter. 



Locality and Formation. H, I, K, L, M, N, West side of Pistolet 

 Bay, Burnt Cape, Table Head, and Point Rich, Newfoundland ; Quebec 

 group. 



Collector. J. Richardson. 



MURCHISONIA AGILIS. (N. Sp.) 



Description. The casts of the interior of this species are elongated 

 gradually tapering, with apparently about fifteen short and nearly 

 uniformly depressed ventricose whorls. 



A fragment 24 lines in length tapers from a diameter of 3 lines at the 

 larger extremity to 4 at the smaller. It has nine whorls. 



Another specimen of twelve whorls tapers from 6 lines to a point in 

 25 lines. 



This species somewhat resembles M. gracilis, but differs in having the 

 whorls shorter, not so convex, and the suture not crossing so obliquely ; 

 surface unknown. 



Locality and Formation. G and H, Cape Norman and Table Head, 

 Newfoundland ; Quebec group. 



Collector. J. Richardson. 



MURCHISONIA PLACIDA. (N. sp.) 



Description. Shell small, short, of about four uniformly ventricose 

 whorls ; an obscure narrow band at the lower third of the last whorl ; 

 apical angle about 47 Q . Surface unknown. There is a minute umbilicus. 

 Length about 8 lines ; width at the aperture about 5i lines. 



Locality and Formation. G, Cape Norman, Newfoundland ; Quebec 

 group. 



Collector. J. Richardson. 



Genus MACLUREA. (Lesueur.) 



Remarks. In the Palaeontology of New York, vol. i., there are two 

 species of this genus, M. sordida and M. matutina, described and 

 figured as occurring in the Calciferous formation. The original specimens 



