part 3] ciiAROPiiTTA or the lower headojs^ beds. 187 



6. CiiAEA TORXATA, sp. nov. (PL Y, figs. 1-3.) 



Oogonium ellipsoideum vel cylinclrico-ellipsoideum, long. c. 550— 

 700 jx, crass. 400-475 />t, apice paiilo acuto, base truncate ; cellulse 

 spirales convexse, lat. et crass, c. 65 fj, ad apicem dilatse sed coin- 

 planatse, ad basem dilatse, convolutiones c. duodecim exhibentes ; 

 foramen basilare paulo latum et baud profundum, margine cum 

 angulis deorsum prsetendentibiis. Oospora ellipsoidea apice trun- 

 cate, long. c. 600-700 jx, crass, c. 350-400 fi, liras subbumiles 

 novem-decem exbibens ; cobors basilaris diametro c. 100 /x. 



A distinct Avell-marked tj^pe, pale yellowisb to dark brown. Tbe 

 regular rounded spiral cells give it a particularly neat appearance ; 

 the flattened (collapsed) apices cause tbe fruit to seem pointed at 

 tbe apex, while tbe five obtuse points of the basal aperture, pro- 

 jecting downwards, produce a truncated outline below. 



Plentiful in the Mammal- and Basement (Seed) -Beds, and 

 occurring also in tbe Kodent-Bed. In the Basement-Bed oospores 

 are present. 



7. ClIARA SUBCYLIXDRICA, Sp. nOV. (PI. V, fig. 4.) 



Oogonium ellipsoideo-cj^lindricum, long. 475-600 /x, crass. 275- 

 350//. ; cellular spirales convexse, lat. c. Q5j.i, ad apicem paulo dilatse,. 

 convolutiones c. duodecim exhibentes ; foramen basilare latum et 

 baud profundum, margine cum angulis deorsum prsetendentibus. 



Resembling the species last described, but smaller and proportion- 

 ally narrower and more rounded at the extremities. A few whole 

 specimens only were found, and these differ considerably in size.. 

 Four broken specimens, with but slightly developed lime-shell and 

 consequent!}^ concave spiral cells, obtained from the Rodent-Bed 

 (fig. 5), probably also belong to this species. 



Mammal- and Basement (Seed)-Beds, and (?) Rodent-Bed. 



8. Chara polita, sp. nov. (PI. V, figs. 9 & 12.) 



Oogonium globoso-ellipsoideum, ad basem paulo fastigatum, long.. 

 675-750 ji, crass. 625-675 /x; cellulse spirales leves lat, c. 80- 

 100 /x, ad apicem paulo dilatse, convolutiones octo-decem exbi- 

 benies ; foramen basilare diametro c. Qd /x, ore paulo dilato. 



Brown to nearly black, when fully developed smooth and shining,, 

 varying somewhat in form, but usually having the base and apex 

 rounded. A few rather larger fruits, with the spiral cells showing 

 one or two more convolutions, may belong to this species. 



Limestone-Band, fairly numerous. 



9. Chaba strobilocarpa, sp. nov. (PI. Y, figs. 7 & 8.) 



Oogonium obovoideum deorsum conspicue fastigatum, apice- 

 rotundato, long. 850-1000 fx, crass. 550-600 /t ; cellulse sjiirales 

 concavse, lat. c. 100-125 /«, ad apicem et basem dilatse, convolutiones- 

 novem-undecim exhibentes ; foramen basilare parvum, valde angu- 

 latum. 



