324 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



Flagiothyni, Whidborne,* has a tooth but not a fold on the columellar 

 lip, but the Littorina (ilaht of G. and F. Sandberger,f which is probably 

 also a Plagiotliyra, as it too has a tooth on the columellar lip, is very 

 similar in shape and ornamentation to the type of Astrcdites. 



(S.) ASTRALITES FIMBRIATUS. (N. Sp.) 



Plates 42, figs. 10, 10a, 11 and 11a, and 45, fig. 6. 



Shell with a. moderately elevated spire, which is about equal in height 

 to the outer volution. W^horls five, those of the spire obliquely com- 

 pressed, the third and fourth with a sinuous subspinose frill at the suture 

 below, the outer one sub-angular at the periphery and encircled with a 

 prominent, thin, laminar and flexuous subspinose keel : base shallowly 

 depressed in the centre : suture indistinct. 



Surface of the upper or apical side marked with numerous, close-set 

 and rather regularly disposed spiral raised lines, and \\'ith broad faint 

 radiating plications, the centre of that jjart of the outer volution being 

 partially encii-cled by a. row of aVj(mt six obscurely defined, low, distant 

 tubercles : lower surface or Ijase marked with fine oblique lines of growth 

 cxterioi'ly, but smooth in the central depression. 



In oasts of the interior of the shell, the suture is deeply impressed, the 

 periphery narrowly rounded and the base deeply unibilicated. 



Pentamerus Point, Lake Manitoba, J. B. Tyrrell and J. P. Whiteaves, 

 1888 : one very young specimen. Dawson Bay, Lake Winnipegosis, four 

 miles west of Salt Pcjint (two specimens), and at the mouth of the Red 

 Deer River (one specimen), D. B. Dowling, 188.S. A few specimens, also, 

 were collected by Mr. J. B. Tyrrell, in 1889, from I>awson Bay, at Whi- 

 teaves Point, at the mouth of Steep Rock River, four miles west of Salt 

 Point, and at the mouth of the Red Deer River. 



The specimens so far obtained at these localities consist of numerous 

 casts of the interioi' of the shell, a few moulds of the exterior, in dolo- 

 mite, and a single testiferous specimen (fig. 10a) in which only the base 

 is exposed. All the internal casts, .such as the one represented l)y figs. 

 11 and 11a on Plate xlii, show the characteristic spiral groove in the 

 umbilical perforation, caused by the plication of the columella. 



(S.) EuOMPHALUS (Strapai{ollus) annulatus, Phillips. 



Vlate 43, figs. 1, la and 2. 

 Eumnphclm unnuhttiis, Phillips. lcS41. Pal. Foss. Coi-nvv., Di'V. and W. Somers., p. 



las, ]j1. ix, fig. 170*. 



*Mon. Devon. Faun, 8. England, vol. F, p. 2(i4. 



tVeistein. Rheinisch. .Scliiolitensyst. Nassau, 18.50-!ie, p. 21!), pi. xxv, figs. 14, 14a-c. 



