BY G. I. PLAYFAIR. 483 



Var. PAPILLATUM, n.var. (Pl.xiii., f.20). 



Forma var. sulcata consimilis, sulcis nuUis, papilla autem sub- 

 apicali ornata. Long.35; lat.33; basis 22; ap.l2; isth.8/x. 



Canley Yale (110). 



In all the(llO) specimens the papilla was general and distinct, 

 showing plainly in side-view, whether it occurred in VAVxyclopeum, 

 var. suhhexagonum, var. suhreniforme, or var. 2^«pi^^a<^<»i. This 

 is another point that goes to show that differences in the mem- 

 brane are largely due to conditions of environment affecting all 

 alike. In other localities, the papilla is rare or only faintly- 

 expressed, the form of the cell being the same. 



Var. SUBHEXAGONUM, n.var. (Pl.xiii., f.Sa, 11). 



Forma semicellulis var. cyclopeo congriientibus, subhexagonis 

 autem; dorso elevato, plus minusve angulato; interdum papillis 

 subapicalibus 1-3 instructis. Long.33; lat.29; ap.lO; isth.6/ij 



Guildford(114). 



Found also as : — 



Forma mixta 1. — var. suhhexagonum et var. cyclopeum. Long. 

 33; lat. var. subhex.'Id, v&v.cyd. 27; isth.6/x. 



Forma mixta 2. — var. suhhexagonum et var. suhreniforme. 

 .Long.34; lat. var. subhex.30, var. suhren.2.b; isth,5/i. 

 Guild ford (11 4). 



Var. CYCLOPEUM(Playf.), ante, 1907, PI. v., f.l2. 



Granulnm parvum infra apices saepissime abest. Pyrenoidibus 

 singulis. Endochroma verticaliter divisa. Long.30-36, lat.26-32j 

 basis 18; crass. 18; isth.6-8/i. 



Collector, Guildford(114). (Pl.xiii., f.7). 



This form, first found years ago at Collector, is not uncommon 

 here along with other forms of the species. It turns out to be 

 the same as Wille's pseudojjrotuberans f. minor in Norges Fersk., 

 Pl.i., f. 18. The breadth being worked out from the figure, his 

 dimensions are 33 x 27 x 21, isth.S/i. It lias no connection with 

 ■Cos. pseudoproiuberans Kirchner. 



