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



The specific name is given in honor of Mr. S. W. Ford, who 

 has done such excellent work at this horizon about Troy, and 

 Schodack Landing, N. Y. 



Formation and localities — Cambrian. Limestones interbedded 

 in shaly Taconic slates, on the roadside just west of the Low 

 Hampton crossing of the Poultney River, two miles south of 

 North Granville, and one mile north of Middle Granville, 

 Washington County, N. Y. 



SOLENOPLEUEA ? ? TUMIDA, n. Sp. 

 Plate I, figs. 2-2a. 



This species differs from Solenopleura ? Nana, with which 

 it is associated at several localities in having a more tumid 

 glabella, narrower frontal lobe and in the absence of an ocular 

 spine. Some specimens of SJ Nana have almost as tumid a 

 glabella, but, usually, it is less elevated. 



The generic reference is provisional, as both S. f tumida and 

 SJ Nana appear to belong to a genus distinct from the typical 

 species of Solenopleura. 



Formation and localities. — Cambrian. Limestones interbedded 

 in the shaly Taconic slates near Rock Hill school house, (No. 8) 

 east of North Greenwich ; 1£ miles east and 3 miles northeast 

 of North Greenwich ; on the west side of D. W. Reid's farm 

 about 1£ miles west of North Greenwich ; £ mile east of South 

 Hartford post office; in the village of East Hebron; on the 

 roadside just west of Low Hampton crossing of the Poultney 

 River and one mile south of Shushan, Washington Countv, 

 N. Y. 



SOLENOPLETTEA ? NANA Ford. 



Plate I, figs. \-\d. 



Solenopleura Nana Ford, 1878. Amer. Jour. Sci., III, vol. xv, p. 126 ; Walcott, 

 1886. Bull. 30, TJ. S. GeoL Survey, p. 214. 



This species was not illustrated by Mr. Ford, and the speci- 

 mens I had, when preparing Bulletin 30, U. S. Geol. Survey, 

 were so poor that the illustrations then given were not satis- 

 factory. Among the specimens in the collections from Wash- 

 ington County I find considerable variation in the convexity 

 of the glabella and also in the granulose surface ; and I suspect 

 that with a large series of more perfect specimens there could 

 be separated a variety if not a distinct species. The pygidium 

 associated with S. f Nana at Troy and also in Washington 

 County, two miles south of North Hebron and one mile north 

 of Middle Granville, has a spinose margin that recalls the 

 pygidise of certain species of Peltura from the Swedish Cam- 

 brian. 



