1915] PALAEOzOIC FossILs FROM HupDSON Bay. 23 
cones in which the ridges become spiny, or are roughened by the promi- 
nence of the transverse strie or ridges. This unique species is pro- 
visionally referred to Eichwald’s genus. 
Named on account of the striking resemblance of the cast to a stem 
of Lepidodendron. 
Locality—Lower rapids, Shamattawa river, Manitoba. 
Horizon—Ordovician. ; 
No. 321 S. Royal Ontario Museum of Palaeontology. 
ORTHOCERAS, sp. indet. 
Two fragments of orthoceracones. 
One fragment shows a body chamber about 44 mm. long, and por- ' 
tions of three camerae. The transverse section is elliptical, 25 mm. by 
28 mm. at the third septum. Septa about 5.5 mm. apart. No siphuncle 
_ preserved. 
The second fragment is from a smaller individual of possibly the 
same species; it is 45 mm. long, elliptical in section, 25 mm. by 20 mm. 
at the anterior end. 
Locality—Lower rapids, Shamattawa river, Manitoba. 
Horizon—Ordovician. 
No. 333 S. Royal Ontario Museum of Palaeontology. 
ACTINOCERAS, Bronn. 
ACTINOCERAS, Bronn. Lethaea Geognostica, Zweite Aufl., Band. I, p. 97, 1837. 
ACTINOCERAS, Hyatt. Proc., Boston Soc. of Nat. Hist., vol. XXII, p. 272, 1884. 
ACTINOCERAS, Foord. Cat. Foss. Ceph., Brit. Mus., p. 164, 1888. 
The characteristics of the genus are described in the above works: 
it is unnecessary to repeat here the details of structure. Of true Acti- 
noceras or the modified form, Hurvonia,' our collection contains at least 
eight distinct species, which in most cases are represented by siphuncles 
only or by siphuncles with a fragment of the septate shell. 
ACTINOCERAS BIGSBYI, Bronn. 
Plate VI, Figure 7. 
ORTHOCERAE, Bigsby. Trans. Geol. Soc., ser. 2, Vol. I, p. 198, pl. XXV, figs. 1 and 2 
(excl. fig. 3), 1824. 
ACTINOCERAS BIGSBYI, Bronn. Lethaea Geogn., Band I, p. 98, Taf. I, fig. 8 (after Bigsby), 
1837. 
ACTINOCERAS BIGSBYI, Foord. Cat. of Foss. Ceph., British Museum, p. 168, 1888. (For 
extended synonomy see this article.) 
?ACTINOCERAS BIGSBYI, Whiteaves. Trans. Royal Soc. Can., Vol. IX, sec. IV, p. 84, pl. X, 
‘fig. 2, 1891. 
ACTINOCERAS BIGSBYI, Parks. Bur. Mines of Ont., 22nd Rep., p. 191, 1913. 
1 Trans. Geol. Soc., ser. 2, Vol. I, pt. II, explanation of pl. XXVIII, 1824. 
