14 



Euomphalus sp. ? This very closely resembles E. circum- 



llratus (Wliitfielcl) described from tlie rocks at Fort Cassin, Lake 

 Charaplain. 



Pkurotoniarlct n. sp. This does not appear to be allied to any 

 known species. 



Pleurotomaria (Scalites) n. sp. Tn some respects tin's form is 

 allied to F. docens (Billings), but differs from it it in the flatness of the 

 spire and the formation of the upper surfaces of the whorls. So far 

 there appears to be no important relation between the obscurely carin- 

 ated margin of this species and the peculia'ly furrowed spiral band 

 which is so characteristic of P. docens. In one instance an interesting 

 feature was observed in this form in the presence of an inner or pillar 

 lin which folds over and completely closes up the umbilicus. 



Pleurotomaria supracingidata. As this form is represented by 

 only one imperfect and very poorly preserved specimen, it is doubtful 

 whether more complete information will confirm its reference to this 

 species. 



Metoptoma n. sp. This has some slight resemblance to J/, instablis^ 

 from the Quebec Group, but differs from it in the form of the anterior 

 margin and the shape and position of the apex. 



At the Elm tree, Pointe au Pin, in a bed of magnesian limestone , 

 Pleurotomaria gregaria was found associated with some Crustacea which 

 have not as yet been fully worked out. This species, described from 

 the Calciferous of Sb. Annes, P.Q, differs from the characteristic Pleuro- 

 tomaria of the Trenton, being one of the group to which P. Laurentina, 

 r. normani, etc., etc., belong. The finding of two more undoubted 

 Calciferous species {P. gregaria and Lingida Mantelli) in the Chazy 

 supplies an additional argument in favor of attaching the Calciferous to 

 the Silurian. The predominance of large Orthocerata, Gasteropoda 

 {Murchisonia, Ophileta, Raphi stoma), etc., together with tribolites 

 resembling those of the Trenton group rather than the Cambrian, are 

 arguments in favor of separating it from the Cambrian. 



The above notes must be regarded as merely of a preliminary 

 nature, for as the actual time devoted to field work amounted to only a 

 few days, it is obvious that so short a period must have been altogether 



