200 CAMBRIAN BRACHIOPODA. 



43. Ordovician: Shales on the summit of Moses Hill, 2 miles (3.2 km.) west of North Greenwich, near the line 

 between the Schuylerville and Cambridge quadrangles (U. S. G. S.), Washington County, N. Y. (C. D. Wal- 

 cott, 1887). 

 Acrothele pretiosa. 



43a. Lower Cambrian: Limestone 1 mile (1.6 km.) east-northeast of Salem, Cambridge quadrangle (U. S. G. S.), 

 Washington County, N. Y. (C. D. Walcott and W. P. Rust, 1887). 



Botsfordia cselata. 

 Acrotreta sagittalis taconica. 

 Protospongia sp. 

 Hyolithes impar Ford. 

 Microdiscus connexus Walcott. 

 Microdiscus lobatus (Hall). 



Microdiscus speciosus Ford. 

 Agnostus desideratuK Walcott. 

 Ptychoparia cf. adamsi (Billings). 

 Protypus clavatus Walcott. 

 Zacanthoides eatoni Walcott. 



44a (a little north of 44b). Lower Cambrian: Limestone on Valatie Kill, near the line between Nassau and Scho- 

 dack townships, near line between Troy and Kinderhook quadrangles (U. S. G. S.), Rensselaer County, 

 N. Y. (C. D. Walcott, 1887). 



Acrotreta sagittalis taconica. 



Microdiscus connexus Walcott. 



44b (a little south of 44a). Lower Cambrian: Limestone near North Chatham, in the northern part of the Kinder- 

 hook quadrangle (U. S. G. S.), Columbia County, N. Y. (C. D. Walcott, 1887). 



Micromitra (Iphidella) pannula. 

 Lingulella granvillensis. 

 Acrotreta sagittalis taconica. 



Hyolithellus micans (Billings). 

 Agnostus sp. 



4Sa. Lower Cambrian: Limestone at McNaughton Corner, 1 mile (1.6 km.) east of Salem, Cambridge quadrangle 

 (U. S. G. S.), Washington County, N. Y. (Ira Sayles, 1887). 



Acrotreta sagittalis taconica. 

 Archeeocyathus dwighti Walcott. 

 Archseocyathus rarus (Ford). 

 Hyolithellus micans (Billings). 



Microdiscus lobatus (Hall). 

 Microdiscus speciosus Ford. 

 Solenopleura tumida Walcott. 

 Zacanthoides eatoiii Walcott. 



45b. Lower Cambrian: Limestone near the roadside about 1,200 feet (366 m.) east of Bristol's house, near Low 

 Hampton, about 5 miles (8 km.) east-northeast of Whitehall, Whitehall quadrangle (U. S. G. S.), Wash- 

 ington County, N. Y. (Ira Sayles, 1887). 



Obolus prindlei. 

 Acrotreta sagittalis taconica. 

 Platyceras primsevum Billings. 

 Hyolithellus micans (Billings). 

 Hyolithes americanus Billings. 



Hyolithes impar Ford. 

 Microdiscus speciosus Ford. 

 Elliptocephala asaphoides Emmons. 

 Solenopleura tumida Walcott. 



47a. Lower Cambrian: Sandstone on the southwest side of Sailings Mountain, 2 miles (3.2 km.) east of Natural 

 Bridge, Rockbridge County, Va. (C. D. Walcott, 1891). 

 *Kutorgina sp. undt. I Hyolithes communis Billings. 



Obolella minor. I Olenellus sp. 



47o. Lower Cambrian: Sandstone 2 miles (3.2 km.) west of bridge at Harpers Ferry, Jefferson County, W. Va. 

 (C. D. Walcott, 1892). 

 Obolella minor. 

 Olenellus thompsoni (Hall). 



47d(seel6f). Lower Cambrian: Sandstones 1 mile (1.6 km.) east-southeast of Smithsburg, Washington County, 

 Md. (C. D. Walcott, 1892^ 

 Obolella minor?. 

 Olenellus thompsoni (Hall). 



47e (see 16f). Lower Cambrian: Sandstone on Observatory Hill, 2 miles (3.2 km.) south of Keedysville, Wash- 

 ington County, Md. (C. D. Walcott, 1892). 

 Obolella minor. 

 Olenellus thompsoni (Hall). 



47f (see 16f). Lower Cambrian: Sandstone at Eakles Mills, 2 miles (3.2 km.) south of Keedysville, Washington 

 County, Md. (C. D. Walcott, 1892). 

 Obolella minor. 

 Olenellus thompsoni (Hall). 



