269 



cation, and which bifurcates at intervals of about eleven mm. Zooscia 

 rhombic, a little longer than wide, seven in two millimetres measuring 

 lengthwise, and eight to eight and a half measuring transversely, divided 

 by thin, straight longitudinal partitions, which form their sides and sepa- 

 rate them into longitudinal rows. Apertures of the zooecia obliquely oval. 



" Surface marked by arching strise, which curve convexly forward." 

 One specimen. 



" In regard to this specimen, M. Bassler writes as follows. ' It is a 

 Phmnopora closely allied to several Clinton species, but I should regard 

 it as new. In zooecial structure it is very close to P. muUifida, Hall, 

 and especially to P. fimbriata, James. P. muUifida has a different zooe- 

 cial growth, and slightly larger zooecia. P. fimbriata has about the same 

 zooecial measurements, but the growth of the zoarium is quite different.' 



" Seven other species of Phmnopora are known to occur in the Cambro- 

 Silurian and Silurian rocks of Canada. These are : P. incipiens, Ulrich, 

 from the Trenton limestone of Montreal ; P. constellata and P. explanata, 

 Hall, also P. punctata, Nicholson & Hinde, from the Clinton of Ontario ; 

 P. ensiformis, Hall, from the Clinton and Niagara formations of Ontario ; 

 and P. excellens {Ptilodictya excellens, Billings) & P. superba (Ptilodictya 

 superba, Billings) from the Anticosti group of that island." 



BRACHIOPODA. 



Steopheodonta (Brachtprion) sp. indet. 



Surface marked with very fine, equal, radiating raised lines. 

 Three very imperfect specimens. 



Camarot^chia Ekwanensis, Whiteaves. 



Two specimens, that are probably referable to this species, though the 

 ribs seem to be more rounded, perhaps because the test is exfoliated. 



CRUSTACEA. 



Trilobita. 



Calymene Niagarensis 1 Hall. 



Calymene Niayarensis, HaXl 1843. Geol. Rep. Fourth Distr. N.Y., p. 



102 ; and (1852) Pal. N. York, vol. II, 

 p. 307, pi. 67, figf5. 11 and 12. 



Calymene Bluriienhach,ii,'Bi\Vmg&(^&rs) .... 1863 and 1866. The specimens from the 



Niagara and Guelph formations of Ontario, 

 and from the Anticosti group of Anticosti, 

 referred to under that name in the Geol. 

 Canada, and Cat. Silur. Foss. Anticosti. 



