48 TRANSACTIONS OF THE ROYAL CANADIAN INSTITUTE. [VOL. XI 
well seen on weathered surfaces. It is quite possible that this variation 
is of specific value, but having examined numerous examples of the 
species, I am of the opinion that too much attention to variation would 
result in the creation of a species for almost every specimen. 
Locality—Assina rapids, Severn river, District of Patricia, Ontario. 
Horizon—Silurian. 
No. 409 S. Royal Ontario Museum of Palaeontology. 
BRYOZOA 
FENESTELLA SUBARCTICA, Whiteaves. 
FENESTELLA SUBARCTICA, Whiteaves. Geol. Sur. Can., Ann. Rep., Vol. XIV, pt. F, p. 39, 
1904. 
FENESTELLA SUBARCTICA, Whiteaves. Geol. Sur. Can., Palaeoz. Foss., Vol. III, pt. IV, 
p. 249, pl. 23, 1906. 
FENESTELLA SUBARCTICA, Parks. Bur. Mines of Ont., 22nd Rep., pt. I, p. 192, 1913. 
One small specimen showing the reverse side. 
Locality—Above Limestone rapids, Severn river, District of Patricia, Ontario. 
Horizon—Silurian. ; 
No. 418 S. Royal Ontario Museum of Palaeontology. 
BRACHIOPODA 
PLECTAMBONITES TRANSVERSALIS. Wahlenberg sp. 
ANONITES TRANSVERSALIS, Wahlenberg. Act. Soc. Upsaliensis, Vol. III, p. 64, n. 4, 1821. 
LEPTAENA TRANSVERSALIS, Dalman. Vet. Acad. Handl, p. 109, pl. I, fig. 4, 1828. 
LEPTAENA TRANSVERSALIS, Hisinger. Pet. Suecica, p. 69, pl. 20, fig. 5, 1837. 
LEPTAENA TRANSVERSALIS, Murchison. Sil. Syst., p. 629, pl. 13, fig. 2, 1839. 
STROPHOMENA TRANSVERSALIS, Hall. Geol. Rep., N. York, p. 105, fig. 4, 1843. 
LEPTAENA TRANSVERSALIS, Hall. Pal., N. York, Vol. II, p. 256, pl. LIII, figs. 5a-1, 1851. 
PLECTAMBONITES TRANSVERSALIS, Hall and Clarke. Pal., N. York, Vol. VIII, pt. I, p. 298, 
pl. XV, figs. 34-36, 1892. 
One cast with a part of the shell adhering. The dorsal valve is 
very convex and the ventral valve deeply concave. The cardinal angles 
are broken off. The shell shows numerous distinct striz, with very 
delicate intermediate striae. Although the specimen is very imperfect 
the identification is made with some assurance. 
Locality—Limestone rapids, Fawn river, District of Patricia, Ontario. 
Horizon—Silurian. 
No. 407 S. Royal Ontario Museum of Palaeontology. 
ATRYPA, sp. tndet. 
Two decorticated ventral valves presenting the general shape of 
Atrypa. The ornamentation consists of very fine radiating striz only. 
Locality—Limestone rapids, Fawn river, District of Patricia, Ontario. 
Horizon—Silurian. 
No. 408 S. Royal Ontario Museum of Palaeontology. 
