80 



Cyclonema Montkbalbnsis. (N. sp.) 



Fig. 28. 



Description. — About one mch in length and breadth ; whorls about three, 

 moderately ventricose, most prominent in the lower half; suture rather 

 deep. Aperture ovate, somewhat effuse below, the upper half of the inner 

 side formed by the penultimate whorl. Sm-face with fine sharp crowded 

 lines of growth just visible to the naked eye. These are crossed by 

 stronger spiral lines four or five in the width of one hne with one or two 

 smaller between each of the larger. 



Length of the most perfect specimen seen 12 lines ; width 11 lines ; 

 height of aperture 8 fines ; width of aperture 6 fines. 



This species is about the size of C Halliana, (Salter) but the whorls 

 are less ventricose and the surface is more closely striated. 



Locality and Formation. — Island of Montreal. Trenton limestone. 



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



Pleubotomabia Eugenia. (N. sp.) 



Fig. 29. 



Pig. 30. 



Fig. 31. 



Fig. 32. 



Fig. 29. — Pleurotomaria Eugenia. Fig. 30 view of the underside. Fig. 31 shewing 

 the aperture. Fig. 32. — P. Arachne shewing the spire and band. 



Description. — Obtusely sub-lenticular ; spire depressed conical ; apical 

 angle varying from 115° to 125° ; whorls about four, gently convex above 

 near the suture, and concave in the outer one third, the margin surrounded 

 by a flat spiral band placed obfiquely on the edge of the outer margia and 

 sloping upwards and inwards. Under-side of whorls strongly and uni- 

 formly ventricose ; umbificus closed. Aperture subquadrate ; upper side 

 somewhat straight ; outside forming an angle of about 100° with the upper 

 at the margin but below the margin uniformly curved down to the middle 

 of the lower side which is somewhat straight and sloping obliquely upwards 

 in the inner half; inner fip obsolete or excessively thin and attached to 

 the surface of the penultimate whorl. Width 9 or 10 lines ; height about 

 I of the width ; band i of a fine wide at the aperture but gradually dimi- 

 nishing towards the apex. 



