44 F 
EKWAX RIVEH. 
Spirifer (?) sp. indot. 
Ekwaii river ; porta^^'e road at falls, one specimen ; and at foot of 
portage road, one specimen : both casts of the interior of ventral 
valve.s that are possibly referable to ,s’. Sowerby, but that are 
much too imperfect and too badly preserved to be satisfactorily deter- 
mined even generically. 
Relicularia septenlriunaUs, sp. nov. 
Shell strongly biconvex, but often with a faint, shalloA', narrow 
longitudinal groove or depres'ion in the median line of each valve ; 
varying in outline in difTerent -jtecimens from subovate or somewhat 
pentagonal and a little longer than wide, to not far from circular and 
as wide as long, but always abruptly contracted and attenuate in the 
uinbonal region behind ; front margin of the valves straight and 
entirely devoid of a mesial fold or sinus. 
Ventral valve with a narrow but prominent or produced umbo, a 
depressed, incurved and acute beak, and an extremely small delthy- 
rium. 
Umbo and beak of the dorsal smaller and less prominent. 
]\Iost of the specimens are liitle more than mere casts of the interior 
of the closed valves. Their surface is entirely devoifl of ribs of any 
kind, and at lirst sight would seem to be marked only with concentric 
lines of growth. Ilut, upon clo.ser examination, numerous, obscure, 
close-set and very slightly raised concentric lines, or fa'nt and minute, 
low, rounded ridges, can be detected on portions of the exfoliated test 
tliat happen to be preserved, and the shell structure, under a lens, is 
seen to b'- fibrous. 
Characters of the interior of the valves unknown, though there are 
indications of a median septum in each, 
Ekwan river : lower I'apids, one specimen ; middle rapid, one speci- 
men ; and portage road at falhs, four specimens. 
Tills large and nearly smooth .species is provisionally referred to the 
genus H^ficiditria on aocouut of its general re.seinblance to R. modesta 
(Hall), and R. pc.rple.ra (.McChesney) which is the Spirijer linmtus of 
Shumard and other American pala-ontologists, but not of Martin ; 
though it may prove to be a Marhiiia. 
Reiicularin (?) sp. indet. 
Ekwan river, foot of portage road : two specimens, each of which 
has the whole of the dorsal valve and most of the ventral preserved. 
