■ HUDSON RIVER BEDS NEAR ALBANY 521 



Aparchites minutissimus, Hall, c 



Ctenobolbina ciliata, Emmons sp. c 



Lepidocoleus jamesi, Hall d Whitfield sp. cc?- i 



Turrilepas (?) filosus sp. n. v^ 



Pollicipes siluricus sp. n. r 



CaJymmene sp. small pygidia. r . 



Trlnucleus concentricus, Hall, cc : 



Tdarthrus becki, Oreen sp. cc 



While this fauna by its most common fossils, GorynoideB 

 curtus, Diplograptus quadrimucronatus, and 

 Triarthrus becki, which cover whole surfaces, and by the 

 presence of Leptobolus ins ignis and Lin gu la curta 

 is characterized as being of Utica age, it contains a considerable 

 number of Trenton as well as of Lorraine forms. The Trenton 

 forms are: 



Olimacograptus caudatus, Cyclospira bisul* 

 cata, Cyrtoceras annulatum, Goniophora 

 carinata, Gtenodonta levata, and Gonularia 

 trentonensis. 



The Lorraine forms are : Pholidops subtruncata, 

 Plectambonites plicatella, Modi o lops is mo- 

 diolaris, Aparchites minutissimus, Gtena- 

 bolbina ciliata. 



^The vertical range of this minute but pretty fossil cirriped is worthy of 

 special notice. It was originally described by Hall and Whitfield (Paleon- 

 tology of Ohio. 1875. 2:106) from the Hudson river group, Cincinnati O., 

 the authors stating however, at the same time, that they had received 

 from C. D. Walcott " specimens apparently identical on surfaces of Tren- 

 ton limestone from near Trenton Falls N. Y." This statement can be 

 verified by the writer, who collected in the Rafinesquina deltol- 

 dea beds of Trenton Falls a well preserved specimen. The collectioni 

 from the shales of the Hudson valley prove now that it also occurs and is 

 even most abundant in different horizons of the Utica terrane; for it hat 

 been found besides in the Lorraine beds of Waterford (station 1), in th« 

 upper Utica beds of Green Island (station 10) and of the Dudley observa- 

 tory (Dr Beecher), in the lower Utica beds of Mechanicsville (station 5) in 

 great profusion, and in the middle Trenton shales of Port Schuyler (station 

 23). It therefore persisted, at least in this region, from the middle Trenton 

 into the Lorraine. 



^See descriptions of this and the next species p. 577. 



