74 CONTRIBUTIONS TO DEVONIAN PALEONTOLOGY. [bu'll.242 
as representing a very late survival in this region of a typical Hamil- 
ton species.'' 
Zone 16 of Catawissa section (H53 A). — Succeeding zone 15 are 25 
feet of nearly barren beds. 
Zone 17 of Catawissa section {11^53 A). — This zone is composed of a 
mass of fossil shells 1 foot in thickness at an elevation of 1,000 feet 
above the base of the section. 
Faunule of zone 17 of Catawissa section {1453 A). 
[a, abundant; c, common: r, rare.] 
1. Cystodictya meeki (r). 
2. Paleschara sp. (r). 
:>. Chonetes scitulus (a). 
4. Cryptonella eudora (r). 
5. Atrypa reticularis (r). 
6. Cyrtina hamiltonensis (c). 
7. Spirifer mesistrialis (a) . 
8. S. pennatus var. posterus (a). 
9. Amboceelia gregaria (r). 
10. Actinopteria perstrialis (r). 
11. Bellerophon sp. (r). 
12. Cyclonema sp. (c). 
13. Loxonema sp. (r). 
14. Tentaculites spiculus (c). 
Zones 18 to 20 of Catawissa section (lift 3 A). — The 35 feet of olive- 
gray beds (18) following the last zone are terminated above by a 3-inch , 
band of the shells of Sp. pennatus var. posterus (19), above which 
comes 60 feet of hard sandy beds (20) with few fossils and with a bed I 
of large concretions near the top. 
Zone 21 of Catawissa section (14-53 A). — A 6-inch band of calcareous 
rock contains the following faunule: 
Faunule of zone 21 of Catawissa section {1453 A). 
[a, abundant; c, common; r, rare.] 
1 . Zaphrentis sp. 
2. Cystodictya meeki (c). 
3. Cyrtina hamiltonensis (a). 
4. Spirifer mesistrialis (a). 
5. S. pennatus var. posterus (c). 
6. Amboccelia gregaria (r). 
Zone 22 of Catawissa section (H53 A). — The species comprising the 
faunule of zone 22 are the following: 
Faunule of zone 22 of Catawissa section {1453 A) . 
[a, abundant; c, common; r, rare.] 
1. Stropheodonta (Leptostrophia) inter- 
strialis& (r). 
2. S. (L. ) perplana var. nervosa (a). 
3. Schizophoria striatula (r). 
4. Cyrtina hamiltonensis (c). 
5. Spirifer mesistrialis (c). 
6. S. pennatus var. posterus (c). 
Zone 23 of Catawissa section (1^63 A). — Twenty feet of nearly bar- 
ren beds follow the last horizon. 
" With the exception of that species the faunule is very similar to one occurriug in the middle part 
of the Ithaca member at Ithaca. — H. S. W. 
b See footnote, p. 35. 
