BY G. I. PLAYFAIR. 521 



setae of Chodatella suhsalsa and Ch. longiseta were often, 

 especially in the former, quite as robust as those of La(j. 

 Gcncvensis. Compare also Chodat's figure of Ch. longiseta in 

 Algues vertes de la Suisse, p. 192, f.35, and Ch. citriformu 

 Snow (a variant) in Plankt. Alg. of L. Erie, PI. ii., f.1-3. 

 When, finally, the characteristic whorl of Ch. longiseta and 

 the three setae of Ch. suhsalsa appeared at either end of the 

 cell (PI. liii., f.28), and likewise a combination of the three 

 of Ch. suhsalsa with the two of L. Genevensis (PL liii., f.27), 

 it became evident that I was dealing with diverse variations 

 of a single species. The presence of forms (especially var. 

 gracilis mihi) agreeing exactly in size and shape with Cho- 

 dat's types, made it quite clear that that species was Lager- 

 heiniia Genevensis Chod. Vide also the notes, infra, under 

 the various forms. The genus Chodatella cannot stand ; the 

 basal tubercles of the setae in Lagerheimia., which form the only 

 distinction between the two genera, are very often wanting, and 

 even when present, they are not permanent, but become confluent 

 with the setae as the latter develop. Out of a considerable number 

 of cells examined, they were present in one individual only. 



Genus Lagerheimia Chodat, emend.* 



Cellulse glohosce, ellipsoidege vel cylindraceae, apice 



utroque rotundatae vel acuminata; membrana firma in utro- 

 que fine setis 2-pluribus longis plus minus arcuatis, basi 

 vulgo subcrassis (rarissime in tuberculis sedentibus) donatae. 

 Cellula matricalis inter setas nonnunquam papilla instructa. 



[Omit: — "Inter setas invenituv globulus hyalinus."] 



corpusculum amyliferum 2-6 gerens Setae autospo- 



rarum interdum intra cellulam maternam evolutae. My 

 additions are in italics. 



Lagerheimia ciliata (Lagerh.) Chodat. (Plate liii., fig.l). 



Cell. long. 10-1 f), lat. 7-12, setse long, ad 30 p.. Cellulse ovales. 

 The type; synonym, Chodatella longiseta Lemm., in Hed- 

 wigia, 1898. 



* From Lemmermann's diaguusis in Hedwigia, 1898, p. 308. 



