86 
CONTRIBUTIONS TO THE GEOLOGY OP MAINE. 
[BULL. 165. 
stratum, and is a good index of Upper Silurian rocks, though found 
sometimes in the upper division of the Caradoc" (p. 236). 
In addition to these characteristic species of the Tilestone fauna in 
the Maine and Arisaig rocks, a majority of the forms described in 
Sowerby's original list of that fauna are represented b} r the same, or 
closely allied forms, in both the Chapman sandstone and Zone D (Honey- 
man), Arisaig, as will appear from the following table: 
List of representative species of the Tilestone fauna in the Chapman sandstone, Maine, and 
Zone D, Arisaig, Nova Scotia. 
Tilestone. 
Chapman Sandstone. 
Zone D, Arisaig. 
1. 
Cypricardia cymbse- Goniophora cf. Hamil 
C. cymbaeformis, cf. Nu- 
formis toniae 
culites (Orthonota) 
carinata Hall 
2. 
Pullastra laevis Cypricardella cf. gre- 
garius 
not reported 
f Palaeoneilo cf . cuneatus 
Cleidophorus cuneatus 
3. 
Cucullseaantiqua R cf " ™ncentricus 
C. concentricus 
4. 
C. ovata ^ F cf. elongatus 
C. erectus 
5. 
C. cawdori 
P. cf. nuculiformis 
C. elongatus 
P cf. subovatus 
C. semiradiatus 
and others. 
C. nuculiformis 
C. subovatus 
6. 
Area ? ? 
? 
7. 
Avicula rectangularis Pterinea rectangularis 
?cf. Avicula Honeymani 
8.. 
Leptaena lata 1 Chonetes nova scotica 
I C. canadensis 
C. nova-scotica H. 
C. tenuistriata 
" Sp. arrectus var. 
Sp. rugsecostus 
9. 
Spirifer ptychodes 
Sp. concinnus 
Sp. subsulcatus 
(=S. elevata Dalman) 
Sp. cyclopterus Bill. 
Sp. raricosta Bill. 
!(). 
Orthis lunata ? 
? 
11. 
Terebratula nucula not seen 
(=PJiynchonella) 
Rhynchonella (3 species) 
12. 
Lingula cornea not seen 
Lingula sp. 
13. 
Natica glaucinoides ? 
? 
11. 
Trochus helicites Pleurotonraria sp. 
(M 227) 
? 
15. 
Turbo Williamsi Holopea cf. Danai 
? 
in. 
Turritella obsoleta ? 
Murchisonia Arisaigensis 
17. 
T. gregaria Loxonema cf. planogyrata 
? 
is. 
T. conica 
M. aciculata 
19. 
Ortlioceras semiparti- 
tum 
' 0. punctostriatum 
20. 
0. ? 
- A single fragment 
0. nummulara Sow. 
21. 
0. striatum 
0. ibex Sow. 
22. 
0. tracheale , 
.0. exornatum 
23. 
Bellerophon carinatus B. carinatus 
B. carinatus 
24. 
B. striatus ? 
B. striatus 
25. 
B. trilobatus B. trilobatus 
B. trilobatus 
26. 
B. globatus ? 
" B. globatus 
27. 
Tentaculites scalaris? B. cf. elongatus 
T. distans. 
28. 
Battus tuberculatus Beyrichia tuberculta J 
f B. pustulosa Hall 
^ B. equilatera 
