DOWUNG- 
SILURIAN' FOSSILS. 
57 V 
Phragmoceras lineolatum, sp. nov. 
Shell, or cast of the interior of the shell, apparently essentially 
similar to that of P. Xt'stor, a.s descrihed and figured by Hall, in 
general shape and in tliat of its aperture, but with the exterior of the 
te.st marked with very nuinerou.s, closely and regularly disposed, minute 
transverse impressed lines, tliat give to the surface a minutely ribbed 
appearance, under a lens. 
Ekwan river ; middle rapid, a cast of the interior of a large body 
chamber ; foot of portage road, one good specimen and three frag- 
ments ; portage road, at falls, two good specimens and one fragment ; 
and upper rapid, a large but imperfect cast of the body chamber and of 
nine or ten of the chambers between the septa. 
The type of P. ^'esto}' is a mere cast of the interior of the shell, with 
no indications of the surface marking.s of the test, and in P. Xestor. 
var. Cayiadetise, there are remains of rather coarse longitudinal ribs. 
CRUSTACEA. 
OvSTRACODA. 
Isochilinn or Leperdilia, sp. indet. 
Ekwan river, upper rapid : a ratlier large right valve about twelve 
millimetres long, but with only its interior expo.sed. 
TRILOBITA. 
Calymme iViagaremix ? Hall. 
Calimenc Bhnnaihnehii, I’illiiigs, par.< ; but perliaps not of Brongniart. 
Small island in the northern Sutton Mill lake ; an imperfect head 
that is jirobably referable to this species, though it show.s little more 
than a oast of the glaVudl.a, which is proportionately wider in front 
than that of average examples of C. X iagarensifi from the Anticosti 
group of Anticosti. The Canadian Calynienes that 1*1. Billings identified 
with C. Hlnmenhachii are now usually referred to four species, viz., 
C. senarin, Conraii, from the Trenton limestone : C. caUicephala, 
(ireen, from the Hudson River group ; C, Niagarensis, irom the Nia- 
gara, Guelph and Lower Helderberg formations and from the Anti- 
costi gfuup ; and C. plitys, Green, from the Corniferous limestone. 
