dowlisg. 
SILURIAN FOSSILS 
41 F 
Plinde, fcom the Clinton and Xiagai-a formations of Ontario ; and P. 
exceUem {Plilodktya e.rce/lens. Millings), and P. superha {PiUodictya 
superba, Millings), from the Anticosti group of that island. 
MRACHIOPODA. 
Trimerclla Pkwayiensk, nom. emend. 
Trimcrelld hynanrusis, Wliitfave.s. l'.(02. Ottawa Naturalist, vol. xvi, j). HI, 
I>1. It, 1 & 2, pi. m, fig. 1. 
t 
Ekwan river, portage road at falls : three ventrals and two imper- 
fect dorsal valves. 
The specific name is here slightly amended, in accord mce with the 
more modern spelling of the name of the river. 
Trimerfdla boreal Is. 
TritetrcHa horrnlis. Whituavcs. 1U02. (>ttawa Naturalist, vol. xvi, ]>. 142, ]il. m. 
tig.s. 2 & S. 
Kkwan river, lower rapid : a cast of the interior of both valves. 
Stropheodonla, sp. indet. 
Ekwan river, foot of portage road : one well preserved ventral 
valve, with the surface markings essentially like those of *9. raristriata, 
var. arata. 
tSfropheodon/a, sp. indet. 
Small island in the northern Sutton Mil lake : two specimens, with 
the e.xterior marked by very fine, equal, radiating striaj. 
Pleclamhon ites transxiersalis (Wahlenberg). 
Ekwan river, foot of portage road : two imperfect but charac- 
teristic ventral valves. Tn the Museum of the Purvey there are speci- 
mens of this specie.s from the Niagara group at (Irimsby, Dimdas, and 
Hamilton ; from divi.sions 2, 'i and d of the Anticosti group, four 
miles west of .Jupiter river, at East point, and at the Jumpers, Anti- 
costi ; also from the Silurian (upper Silurian) rocks of Ij-iko Temis- 
couata, N.M. 
Orthis, sp. indet. 
Ekwan river, upper rapid : one half of the ventral valve of a 
small, rather coar.sely ribbed and apparently undescribed species of 
the 0. Dmndsoni type. A similar but more perfect valve, in the 
