16 TRANSACTIONS OF THE ROYAL CANADIAN INSTITUTE. [VOL. XI 
BRACHIOPODA 
RHYNCHOTREMA (?), sp. indet. 
RHYNCHOTREMA CAPAX, Conrad, Parks. Bur. Mines, Ont., 22nd rep., p. 190, 1913. 
One imperfect ventral valve, ventricose with moderately elevated 
median fold. The fold seems to be marked by a distinct central plication 
and by one other fainter plication on each side of the major one. Seven 
or eight ribs occur between the median fold and the angles of the shell. 
In the preliminary report this shell was referred provisionally to R. 
capax: while there is a superficial resemblance I fear the specimen is too 
imperfect to justify the comparison. . 
Schuchert records Rhynchotrema minnesotensis, Sardeson, R. inae- 
quivalvis, Castelnau, and R. inaequivalvis subtrigonalis, Hall, in the 
Trenton of Baffin Land. 
Locality—Lower rapids, Shamattawa river, Manitoba. 
Horizon—Ordovician. 
No. 404 S. Royal Ontario Museum of Palaeontology. 
Cf. DINORTHIS PECTINELLA, Emmons sp. 
ORTHIS PECTINELLA, Emmons. Geol. Sur. N.Y., Rep. 2nd Dist., p. 394, fig. 2, 1842. 
Several broken and decorticated specimens, quite impossible of 
identification: they are referred to this species with the greatest doubt. 
Compare also Orthis (Plectorthis) plicatella which Schuchert states is 
a common fossil in the Trenton of Baffin Land. 
Locality—Lower rapids, Shamattawa river, Manitoba. 
Horizon—Ordovician. 
No. 405 S. Royal Ontario Museum of Palaeontology. 
STROPHOMENA (?) TETRASTRIATA, Sp. nov. 
Plate IV, Figure 16. 
One partially worn ventral valve which is made the type of the 
species and two other shells similar in size and shape but lacking the 
characteristic markings. 
The type is 25 mm. wide and 15 mm. long. The beak extends 
slightly posterior to the cardinal line, and the anterior margin is strongly 
inflected. The surface is marked by four distinct but delicate elevated 
ribs, two on each side of the median line, with a greater interval between 
the pairs. Between the ribs, the surface is marked by very delicate, 
anteriorly curved, concentric striae, which are also seen beyond the 
ribbed area, but which do not extend to the lateral margins of the shell. 
1 Proc. U.S. Nat. Mus., Bull. 22, 1900. 
