NOTES ON THE FOSSILS OF ONTARIO. 145 



remote, nearly or quite half a line apart near the mouth, and about 

 a third of a line apart near the middle (from four to five in the 

 space of one line and a half). Spaces between the annulations mai'ked 

 with close-set, sharp longitudinal strise. This species is readily- 

 distinguished by the remoteness of the annulations, and the longi- 

 tudinally-striated interspaces. 



Locality and Formation. — Rare in the Clinton Grovip, Dundas. 



32. Tentaculites neglectus, Nicholson and Hinde. Tube straight, 

 conical, about three lines in length, and two-thirds of a line in 

 diameter at the mouth. Annulations five in the space of one line 

 near the mouth, and nine in the same space at the small end of the 

 tube. Spaces between the annulations marked by fine sharp longi- 

 tudinal striae. 



This species is referable to the same section of Tentaculites as 

 T. distans, Hall, and T. Sterlingensis, Meek & Worthen ; but it is 

 distinguished from the former by its smaller size and much more 

 closely approximated annulations, and from the latter by its straight, 

 not curved, form, its smaller size, and its closer annulations. The 

 walls of the tube appear to have been of more than usual tenuity, as 

 it generally is found in a crushed condition in its upper portion. The 

 longitudinal striae are confined to the spaces between the rings, and 

 do not encroach upon the annulations themselves. 



Locality and Formation. — Clinton Group, Dundas. Not very 

 uncommon. 



33. MuRCHisoNiA SUBULATA, Conrad. {Ref. Murchisonia stihulata, 

 Hall, Pal. N.Y., Vol. II., pi. xxviii., figs, la-d.) Dundas. 



34. Platyostoma Niagarensis, Hall. {Ref. Pal. N.Y., Vol. IT., 

 pi. Ix., figs. \a-v.) Dundas. 



35. Calymene Blumenbachii, Brongniart. Dundas. 



II.— FOSSILS OF THE NIAGARA FOEMATIOK 



36. Stromatopora striatella, D'Orbigny. The species of Stro- 

 matopora which has usually been quoted from the Niagara Lime- 

 stone is the S. concentrica of Goldfuss. Whilst not denying its 

 possible occurrence on this horizon, all the examples which have 

 come under our notice are referable to the S. striatella, D'Orbigny, a 

 species which is nearly allied to S. concentrica, but is readily 

 distinguished by its much more delicate and closely set laminae. 



Locality and Formation. — Common in the Niagara Limestone of 

 Thorold. Rare at Rockwood. 



