190 C. D. Walcott — Fauna of the Upper Taconic 



valve to be perforate, this is owing probably to the minute size 

 of the opening and the imperfection of the specimens which 

 have been examined. 



This is the first instance known to me of the occurrence of 

 this genus in association with the Taconic or Middle Cambrian 

 faunas, as it is essentially a Lower Cambrian type both in New 

 Brunswick, Newfoundland, and Sweden and Wales. 



Formation and localities. — Cambrian. Limestones, inter- 

 bedded in the shaly Taconic slates, at Rock Hill school house 

 (No. 8), near North Greenwich ; 1J miles east of North Green- 

 wich ; lowest fossiliferous horizon on D. W. Reid's farm, 1-J 

 miles west of North Greenwich ; west summit of Bald Moun- 

 tain, in the town of Greenwich ; two miles south of North 

 Granville; on the roadside just west of Low Hampton crossing 

 of the Poultney River; and one mile south of Shushan, all in 

 Washington County, N. Y. 



KlITORGINA PAKNULA White, (sp.). 

 Plate I, figs. 14-14b. 

 Kutorgina pannula. — See Bull. 30, IT. S. G-eol. Survey, p. 105, 1886. 



The specimens of this species, from Washington County, are 

 hardly distinguishable from those obtained on the slopes of the 

 Highland range in southern-central Nevada. In Nevada, the 

 species occurs at the lowest known fossiliferous horizon and 

 ranges up through 1400 feet of strata, but not into the Upper 

 Cambrian or Potsdam horizon. 



The edges of the reticulations on the surface of the New 

 York specimens are usually sharper than those of the Nevada 

 form, but I do not think that the difference is of specific im- 

 portance. 



Its occurrence, in Washington County, in the lower beds of 

 the Taconic formation, is of great interest, as it adds another 

 connecting link between the widely separated localities of this 

 fauna in Nevada and New York. 



Formation and localities. — Cambrian. Limestones, inter- 

 bedded in the shaly Taconic slates, on the roadside, just west 

 of Low Hampton crossing of the Poultney river and two miles 

 south of North Granville, Washington County, N. Y. 



Orthis Salemensis, n. sp. 

 Plate I, figs. Vl-Vta. 



Shell about the average size of the Cambrian species of the 

 genus. Transversely subquadrilateral ; front broadly rounded 

 and slightly sinuate midway : hinge line as long as the greatest 

 width of the shell. 



