98 CONTRIBUTIONS TO DEVONIAN PALEONTOLOGY. [bull. 244. 
Zone 15 of Gulf Brook section (1455 A). — This zone contains the 
following faunule; 
Faunule of zone 15 of Gulf Brook section (1455 A) . 
[a, abundant; c, common; r, rare.] 
7. Leptodesma sp. (r). 
8. Palseoneilo cf. emarginata (r) . 
9. Cypricardella cf. bellistriata (r). 
10. C. tenuis (r). 
11. Conularia cf. congregata (r). 
1. Psilophyton sp. (r). 
2. Dignomia alveata? (c). 
3. Chonetes setigerus (c). 
4. Amboccelia gregaria (c). 
5. Spathella typica (c). 
6. Paheanatina cf. typa (r). 
Zones 16 to 19 of Gulf Brook section (1465 A). — Fossils are scarce 
in these zones. No collections were made. 
Zone 20 of Gulf Brook section (1455 A). — Ten feet of flaggy sand- 
stone afforded the three following species: 
Faunule of zone 20 of Gulf Brook section (1455 A). 
1. Productella arctirostrata (rare). 
2. Ambocoelia gregaria (abundant). 
3. Leptodesma sp. (rare). 
Zone 21 of Gulf Brook section (14-55 A). — This zone contains the 
following species: 
Faunule of zone 21 of Gulf Brook section ( 1455 A ) . 
1. Productella speciosa (rare). 
2. Delthyris rnesicostalis (common). 
3. Ambocoelia gregaria (abundant). 
The specimens of D. rnesicostalis show a double fold on the brachial 
valve and a plication in the sinus. 
Zone 22 of Gulf Brook section (1455 A). — The faunule of this zone 
includes the following forms: 
Faunule of zone 22 of Gulf Brook section ( 1455 A ) . 
1. Orthothetes cf. chemungensis (rare). 
2. Productella speciosa (common). 
3. Delthyris rnesicostalis (common). 
Zone 23 of Gulf Brook section (1455 A). — This zone afforded no 
fossils. 
Zone 24 of Gulf Brook section (1455 A). — A 6-inch band of lime- 
stone contains the following faunule: 
Faunule of zone 24 of Gulf Brook section ( 1455 A ) . 
[a, abundant; c, common; r, rare.] 
1. Orthothetes chemungensis (r). 
2. Chonetes sp. (r). 
3. Productella speciosa (r). 
4. Dalmanella carinata (c). 
5. Atrypa spinosa (r). 
6. Spirifer mesistrialis. 
7. Delthyris rnesicostalis (c). 
8. Ambocoelia gregaria (a). 
9. PaLseoneilo bisulcata (r). 
10. Goniophora cf. chemungensis (r). 
11. Orthoceras sp. (r). 
12. Dinichthys cf. tuberculatus (c). 
13. Onychodus sp. (r). 
