Pkoe. 



768 





Proetus crassimarginatus, Hall, ( Calymene crassimar- 



Vl\\dL,5 .^^^^^ Vlfld j^^^Z^^^\Q. ginata. Hall. 



4th Dist. N. 

 Y., 1843, page 

 172, fig. QS, 5, 

 widely dis- 

 tributed in 

 the upper 



, . i , . , .^ . ^. ^.«^..^ -^mm'^^vmm.m^ bedsof the 



H.L3?0 -:-!»>> Ha,>.-5^y^^ PI 10 Corniferous 



limestone ^i New York.) Hall's 14th Ann. Kept, page 100; 

 and 15th Ann. Rt., plate 10, fig. 10, of the tail-piece of this 

 trilobite associated with a fragment of Fenestella^ found in the 

 Devonian rocks of Wisconsin and figured by Owen, Geol. Wis. 

 1852, plate 3A, fig. 6. See also Hall's fine figures in Pal. N. Y., 



Vol. 7, 1888, plate 20, f. 6-8, 20 

 -31 ; plate 22, f. 20,-26 ; plate 25, 

 fig. %.— Villa, 





Proetus folliceps, Hall, Pal. N. Y., Vol. 7, 1888, page 101, 



plate 23, 

 figs. 3, 

 a tril- 

 obite, 

 with all 



but its crust in fragments, showing the round glabella and its 

 furrows ; 4, profile view of it showing the convexity of the 

 body. (See Hall's remarks on the median pits upon alternate 

 grooves; and on Walcott's discovery of a ventral membrane 

 possessed by some species of trilobites.) Found at many places 

 along the New York outcrop of the Comiferous limestone. 

 Villa, 



H 



