HUDSON RIVER BEDS NEAR ALBANY 525 



Fholidops subtruncata, Hall, r 

 Dalmanella teetudinaria, Dalman sp. cc 

 Plectorthis plicatella Eall. c 



Plectamibonites sericea, Soiverhy sp. var. aspera^ Janies^ 

 Rafinesquina alteroata, Emmons sp. cc 

 ParastrophJa hemiplicata, HaM. c 

 PleuTotomaria cf. lenticularis, Eall. r 



MurchisGnia (Lophospira) uniangulata var. abbreviata, Halh « 

 Cyclonema bilix, Conrad, sp. r 

 Archinacella patelliformis, Eall sp. cc 



Protowartbia cancellata, Eall, sp. (=Belleropboii bilobatus, 

 Eall) c 



Cyrtolites ornatus, Conrad, r 

 Clionycbia undata, Emmons sp. c 

 Technophorus cancellatus sp. n. c 

 Oleidopborous planulatus, Eall. cc 

 Lyrodesma poststriatum, Emmons sp. r 

 L. pulchellum, Eall. c 

 Orthoceras tenuitextumi, Eall sp. r 

 O. lineolatum, Eall sp. r 

 Spyroceras bilineatum, Eall sp. c 

 IsO'telus gigas, Be Kay. c 

 Calymmene senaria, Conrad, r 

 Pterygometopus callicephalus, Eall. cc 



^Tiiis variety is marlied by acute, oblique wrinliles along the cardinal 

 line, such as occur in Strophomena rugosa var. subtentA, 

 and Strophomena incurvata (= S. filitexta). This feature 

 is constant in the vast numbers of valves which compose some of the peb- 

 bles in the conglomerate of Rysedorph hill {see p. 546) and Moor- 

 dener kill, and it continues upv^ard into the Utica shale of Green Island, 

 and Menands, though in these localities forms vp^ith and without wrinklet 

 occur together. The same variety was observed by Dr Beecher in the 

 material from the Dudley observatory, and listed as Leptaena sub- 

 ten t a ?. The wrinkling is apparently rare among specimens collected 

 west of the Hudson river region, for it is not mentioned in the very 

 detailed accounts of the characters of this species in the west by Sardeson, 

 Winchell and Schuchert, but it was listed among the Cincinnati fossils by 

 James as Leptaena asp era and has been figured by Hall and Whit- 

 field. (Geol. sur. Ohio. Paleontology.* v.l. pi. 5. fig. 3 f.) 



