Rhyn. 



908 



9th Regents' Report, N.Y., 1856). Trematospira formosa, PaL 

 N. Y. Vol. 3, 1859, page 215, plate 36, figs 2 a to t ; Rhyncho- 

 spira formosa^ page 485, plate 95 A, fig. 7, ventral inside ; 8 

 enlarged twice, dorsal inside, showing broad cardinal process 

 which curves the extremities ot the beak and, when the vah es 

 are closed, passes beneath the deltideal area of the cardinal 

 process ; also the short median septum ; 9 profile ; 10, upper 

 part of two valves joined as in nature ; 11, section showing in- 

 ternal anatomy. The articulation of RhynGhospira is much 

 like that of Nudeospiva ; the form like Rhynchonella. or rather 

 Waldheimia ; some are like Retrta, but the dorsal valve never 

 has a straight hinge line, nor the ventral the same area, com- 

 mon to the species of that Carboniferous genus (Hall). Lower 

 Helderlerg, Abundant in Aughwick valley, Hunt. Co., Pa., 

 at Orbisonia, etc., over the Waterlime ieds, in the lowest 50' 

 of the Lower LLelderlerg limestones, (T, 41; T3j 126; Proc. 

 P. P. S. Jan. 5, 1876). F/. 

 B.hy;iicliotreta cuneata (Dalman) Yar, americana (UsiW), 



sti^Aii Aao ii3i. aa2. Jkcja 



\m.mt 



Pl.ZS 



Collett's Ind. 1881, p. 310, pi. 25, figs. 29-38. Mag, Vb, 

 Rhynobolus galtensis, Hall, 1871. Whiteaves, Geol.Sur. 



I )'■■ / 



%3- 



\ ■ 



' ~rTT ' 

 ^^f^?^^"" \TktLrCLVes. ~FrJ,f^J<:^,fn72, 





Canada, Pal. Foss. 1884, III, i, page 7, plate 2, fig. 1 a, exterior 

 of pedicle (ventral) valve; plate 8, fig. 3, interior of brachial 

 (dorsal) valve; 3 a, ventral, showing hinge. Has been placed 

 in five diff'erent genera Oholus galtensisj Bill. Ohelltna gal- 



