BY G. I. PLATPAIR. 113 



1 have met with none longer than 38^, and Bernard, Protococc. et Desm., p. 

 209, f. 570, gives 28 — 35 by & — lO^x for Javanese specimens. 



Two shapes are found, (1) with lihnit conical lower end, and (2) with the 

 lower end drawn out and pointed; both are common and usually intermingled. 

 The cyst which 1 have only noted twice is spherical with low broad collar, the 

 membrane faintly and sparsely scrobiculate. > 



Var. ANGULATUM Seligo. (PI. i., figs. 22 — 23). 



Cell. long. 32 — 10, lat. 9, lat. oris 8 — 9, constrict. 7 — Sjj.. 



Fairfield (83, 112, 143). 



Cf. Seligo, Uber einig. Flagell. d. Susswasser, p. 0, f. 1. !iijn. D. cyliiulri- 

 cum var. angulatum (Seligo) Lemm., Gatt. Dinobrijon, p. 518, T. 18, f. 24. 

 Lemmermann has arranged this form under 1). cyUiidricum ; I find it here, how- 

 ever, in company with D. sertularia and of similar dimensions. D. 

 cylindriciim is a much larger form than any of ours, so 1 think it 

 best to tall back on Seligo's original arrangement. Probably the same form is 

 common to both species. 



DiN'OBRYOM cvLiNDRicuM var. DivERGENs (Ii)ih(jf) Lemui. (PI. i., Mgs. 24. 25). 



Cell. long. 42—50, lat. max. 8—10. lat. oris 8—10. constrict, i)—!^. 



Sydney Water ((53, 04, 90); Centennial Park (133); Canley Vale (111); 

 Fairfield (130). 



Syn. I), sertularia var. divergens in Flankt. Sydney Water, p. 516, PI. 57, 

 f. 7. Nearly all the specimens I measured were either long. 44^ or long. 50ju. 



Var. SCHAUi.vSLAXDii Lemm. 



Cell. long. 44—50, lat. max. 9— 10^^. 



Sydney Water (90); Canley Vale (111). 



Syn. D. sertularia var. Schauinslandii in Plankt. Sydney Water, p. 510, 

 PI. 57, f. 8. Found in company with var. divergens, of which it is really only 

 a form. Our specimens are so slightly wrinkled as to make separation difficult. 



Subgenus E P i P r x i s (Ehr.) Lauterborn. 



DiNOBRYON UTRiccLUS (Ehr.) Klebs. (PI. i., figs. 26 — 27). 



Cell. long. 20 — 25, lat. max. 7 — 8, lat. oris 4 — 5^. 



Sydney Water (22); Guildford (77). 



Syn. Epip!/.iis utricuhts Ehr.. Infus., p. 123. T. viii., f. 7; Stein, T. xii., f. 

 6 — 11; Klebs, Zeitschr. f. Wiss Zool., Bd. 55, p. 414; Lemm., I.e., p. 512, T. xviii., 

 /. 1. Our specimens are much shorter than the European; Lemmermann gives 

 long. 30—46, lat. 7— lO^x. 



Var. Tabellariae Lemmermann. (PL i., figs. 28, 29). 



Lorica e. stip. 23 — 28, lat. max. 7 — 9, lat. orif. 4 — 5^. Cyst. diam. lift. 



Fairfield; Guildford (77, 124); Centennial Park, Sydney '(133). 



Lemmermann, Das Plankton schwedischer Gewa-sser, p. 119, T. i., f. 19. 

 This pretty little form is not uncommon, gi'owing on diatoms, waterweeds, etc. 

 The cells are generally solitary or two together, rarely in clumps as in the figure. 

 From the comparison of a number of individuals it is easy to see that the petiole 

 is formed out of the cell wall by a gradual falling together of the lower end 

 of the lorica. There seems to be a distinct disc to the footstalk, at least some- 

 times. The membrane differs from other species of Dinobrgon in that it is 



