186 ME. C. EEID A>'D ME. J. GEOVES OV JUE ~_\v\. Ixxvii, 



In the gathering from the Basement (Seed) -Bed. in addition to 

 a number of loose oospores, some were obtained in their enclosing 

 oogonia. and it is upon these that the description of the oospore is 

 based : but the measurements, etc. may not apply to those of the 

 other beds. The uniformly salient vase-like base separates this 

 and Chara taherculata from all the other species. 



Obtained from the Mammal- and Basement (Seed)-Beds, the 

 Limestone-Band, the Bodent-Bed. and the Mineway. Xext to 

 C. JVrifjlifii this is the most frequent species. 



4. Cha.ea distoeta. sp. nov. (PI. Y, lig. 6.) 



Oogonium ellipsoideo-fusiforme, long. c. lOOU-1200 /.t, crass, 

 c. S7'5-925 u ; cellular spirales latissimae (c. 150 jx) et crassissimse 

 (c. 150 jx) plerumque convexje, apice baud multo dilato, convolu- 

 tiones irregulares septem-octo exhibentes : foramen basilare angus- 

 tum, ore paulo dilato. 



Of a dark purplish-brown, varyinu" niueli in size and shajDe, but 

 cliai-acterized by the usually somewhat tapered apex and base, and 

 by the irregularly-coiled spu-al cells. It is not unlike an extended 

 form of C. JVriglitii. So far as can be gathered from A. Watelet's 

 description and somewhat crude illustrations of his C. clejtressa,^ 

 C. ilistorfa resembles that species, but differs from it in the form 

 of the apex of the spiral cells. 



Obtained in fair quantity from the Bodent-Bed. 



5. Chaea heltcteees, Brongniart. in G. Cuvier tt A. Brongniait's 



• Description Geoloeique des En\irons de Paris ' 1>>'2'1, p. 368 

 & pi. xi, fig. 8. (Pi. V, tig. 11. j 



Oogonium late ellipsoideum, apice plus minusve ti-uncatum. long. 

 0. 1050-1200 fx. crass. 950-1050 /x : celluh^ spirales convexa;, in 

 apice tm-gid^ et plerumque ad jugum cousti4cta?, convolutiones 

 regulares octo— novem. exhibentes : foramen basilare latum et baud 



profundum. margine cum angulis acutis et plerumque prseten- 

 dentibus. 



The fi'uits are variable in shape, usually decidedly longer than 

 broad, but sometimes almost spherical, often conspicuously flattened 

 at the apex and occasionally tapering somewhat towards the base. 

 The liordle specimens are of a light brown with a smooth surface. 

 The dimensions are smaller than those given by Schimper in his 

 ' Ti-aite de Paleontologie Yegetale ' vol. i (1869) p. 222 & pi. v. 

 figs. 20-32. That author shows the num.ber of convolutions of 

 spiral cells displayed as eleven : but in Brongniart's original figure 

 eight only are shown. 



Obtained from the Mammal-Bed and Mineway. 



^ ' Description des Plantes Fossiles du Bassin de Paris " 1866. p. .55 & pi. xr. 



