BY G. 1. PLAYFAIR. 



37 



Dangeard's form is so entirely different from Stein's Tr. rmgulosa, 

 that I propose to make it a distinct variety under the name of 

 7V. volvocina var. Dafigeardii, nom.nov. 



Tr. volvocina y hyalina 

 Klebs, Organ. ein. Flag., p.3 19. 

 'I'he body of the animalcule is ^^^^^^ ^ 

 devoid of chlorophyll. 



Tr. hispidd f3 cylindrica 

 Klebs, I c; cf. Dangeard, I.e., 

 p.l35(no figure). This must 

 be a smaller form of Tr. his-Y^^^-j^Tr. volvocina ^ rug ulosa[i>,tem) 

 pida var. rextangidaris Br. Klebs. a x 650, after Stein; ?>, after 

 Schroder, Ploner Berichte, Bd . Dangeard. 

 v.,T.ii.,f.8; Stein, T.xxii, f.34. 



As Dangeard remarks that it is much smallei- than the type, the 

 dimensions of Avhich are roughly 30 x 20 /x, it must be quite 

 minute. 



Tr. hispida var. suharmata Br. Schroder, I.e., p. 49, T.l, f.7. A 

 broadly oval form a little larger than the type, with longer spines 

 at each end. Schroder's figure gives dimensions of 37 x 29 /x, 



Tr. hispida var. punctata Lemra., von Dr. Volz ges. Siiss- 

 wasseralg., p. 165, 1 904 (no figure). Oval, closely and finely punc- 

 tate, with a low, straight, truncate neck. 



Fig. 18.^ — Tr. spinosa Stokes, after Stokes. Fig. 19. — Tr. ar^nata var. 

 Steinii Lemm., x 650, after Stein. Fig. 20. — 7V. hiUla var, regulariu-s 

 Lemm., x 1000, after Lemmermaun. 



Tr. hidla var. regularius Lemm., ibid., T.xi., f.6. Long elliptic, 

 30 X 14 /x, with numerous, very short scattered spines, no neck 



