6 
MUSEUM BULLETIN NO. 3. 
94 Brachyaspis altilis 
95 B. notans 
96 Bumastes orbicaudatus 
97 Ceraurus numitor 
98 C. pleurexanthe- 
mus 
99 Ceraurinus icarus 
100 Encrinurus multisegmenta- 
tus 
101 Eoharpes ottawaensis 
102 Isotellus gigas 
103 I. cf. maxlmus 
104 Pterygometypus n. sp. 
105 Ischyrina winchelli 
Charleton Formation, The English Head formation is suc- 
ceeded without lithologic or stratigraphic break by the Charleton 
formation. The faunas are likewise continuous and typical 
Richmond species which are introduced in the former become 
exceedingly abundant in the latter. A fact of some importance 
for geography and stratigraphy is the greatly increased thickness 
of the formation in the northern outcrops, the thickness of the 
south shore consisting of 730 feet, while that of the north 
exceeds 900 feet. The lithology of the north shore is also quite 
different from that of the south, the latter consisting largely of 
limestones and shales with the former predominating, while on 
the north shore shales are far more important and toward the 
top much sand is present, although a real sandstone is not de- 
veloped. 
Corals which occur quite commonly in the English Head 
formation, here become abundant, particularly on the south side, 
where heads of nearly three feet diameter occur. Through a con- 
siderable thickness near the middle of the formation the peculiar 
hydroid,Beatricia, lies around on the reef like logs in a swamp, or, 
slightly salient in the cliffs, projects like guns from a battery. Gas- 
tropods are not nearly so important as in the English Head, 
while the brachiopods play a greater rdle. The complete fauna 
consists of one hundred and sixty species of which seventy-five 
have come from the English Head. Sixty species are confined 
to the formation and fifty-six pass into succeeding formations, 
twenty -eight of which have come from the English Head. The 
species of the formation are: — 
1 Lockeia n. sp. 
2 Lycrophycus vagans 
3 Rusophycus bilobatum 
4 Hindia fibrosa 
5 Rauffella cf. filosa 
6 Beatricia nodulosa 
7 B. undulata 
8 Calapceeia canadense 
9 Columnaria alveolata 
10 Haly sites catenulatus 
11 Lyellia affinis 
12 Lyopora goldfussi 
13 Paleofavosites aspera 
14 P. aspera n. var. 
