of Emmons, in Washington County, JV. Y. 197 



CONOCORYPHE TRILINEATA Emmons (sp.) 



Plate I, figs. 1-lb. 

 For synonymy see Bull. 30, U. S. Geol. Survey, p. 203. 



When examining the collections at Williams College, in 

 1886, I found the specimen from which the figure of Atops 

 trilineatus, in Emmons's American Geology, pi. i, fig. 16, was 

 drawn, and, through the courtesy of Professor S. W. Clarke, I 

 have had a more accurate drawing made of it than the pub- 

 lished figure. A study of the specimen, in connection with 

 heads and pygidias collected from the original locality, shows 

 that the species should be referred to the genus Conocoryphe,* 

 as restricted by Corda, although C. trilineatus differs from the 

 type of the genus G. Sulzeri in having a smaller pygidium 

 and seventeen instead of fourteen thoracic segments; differ- 

 ences, however, of a specific rather than generic importance. 

 The slender free cheeks have not yet been identified. 



On plate xxvii, Bull. 30, U. S. Geol. Survey, figs, la, 15, 

 there are figures drawn by Mr. Ford of the species as identified, 

 by him at Troy, N. Y. The pygidium is similar to that asso- 

 ciated with Solenojoleura? Nana at other localities, and the 

 head may be that of this species, but it is uncertain, owing to 

 the imperfection of the specimens. 



Formation and localities. — Cambrian. In black, argillaceous, 

 shaly Taconic slate on the roadside near the old Beynolds Inn, 

 now D. W. Eeid's farm buildings about one mile west of North 

 Greenwich ; also in the northern part of Easton, about one 

 mile S.S.W. of the village of Greenwich, Washington County, 

 N. Y. 



Ptychoparia Fitchi, n. sp. 

 Plate I, fig. 6. 



This species is founded on a minute head that occurs in asso- 

 ciation with Microdiscus connexus and several other species of 

 the lower horizon of the Taconic slate series. The elongate 

 unfurrowed glabella, wide fixed, cheeks and strongly granulose 

 surface, all unite to give it a facies unknown in any other 

 species with which I am acquainted. 



Formation and locality. — Cambrian. In limestone, inter- 

 bedded in the shaly Taconic slates, two miles south of North 

 Granville, Washington County, N. Y. 



* Mr. S. W. Ford states that this species has been shown to belong to the 

 genus Conocoryphe (Amer. Jour. Sci., Ill, vol. xix, p. 152), but, up to the present 

 time, I have not seen any proof of its true generic relations uor could it well be 

 shown before more perfect specimens of the head were obtained than those illus- 

 trated by Emmons. 



