162 Silurian Fossils of Canada. 



Width of the only specimen examined eight lines ; height fire 

 lines ; width of aperture three lines. 



This species closely resembles the original Straparollus 

 Dionysii upon which Montfort established the genus. It also 

 approaches Euomphalus cT/clostomus, (Hall). Geology of Iowa PL 

 VI. fig., 6 (Hamilton Group Iowa). 



Locality and Formation. — Pauquettes Rapids, Ottawa River, 

 Black River, and Birdseye. (very rare). 



Collector. — Sir W. E. Logan. 



Straparollus Eurydice. N. s. 



"\ ;^;lV^^, |ft||;f 



Fig. 4. Fig. 5. 



Fig. 4. — Straparollus Eurydice. Front view. 

 5. — Side view. 



Description. — Conical, apical angle about 60°, rounded not 

 acute ; height and width about equal ; whorls five, with a nearly 

 circular section, uniformly ventricose ; suture distinct ; umbilicus 

 small, deep, one sixth the width of the base of the shell ; the body 

 whorl obtusely carinated close to the edge of the umbilicus ; the 

 aperture nearly circular, its height slightly exceeding the width. 

 Surface with obscure lines of growth, which cross the whorl a 

 little obliquely from the suture downwards and backwards ; a few 

 wide shallow undulations parallel with the lines of growth. 



Height seven lines ; width the same ; width of aperture three 

 lines, height three and a half. 



Locality and Formation. — Pauquettes Rapids, River Ottawa, 

 Black River, and Birdseye. 



Collector. — Sir W. E. Logan. 



Straparollus asperostriatus. N. s. 



Description. — Shell small, depressed-conical ; apical angle be- 

 tween 80° and 90° ; whorls about three with a nearly circular 

 section, regularly ventricose above ; obscurely carinated along the 

 middle on the underside, suture distinct, umbilicus about one 

 fourth the width of the shell, penetrating to the apex ; aperture 

 circular. Surface with strong sharply elevated lines of growth, 



