BY G. I. PLAYFAIR. 137 



Long. 200, hit. 81, ap. B/x. Lismore; Wyrallah. 



A veiy rare Menoidiuin, but noted from two distinct localities. The body 

 is straight and very long in proportion to the breadth. No distinct rostrum in 

 front, where it is merely narrow and truncate, but the formation and flagellum 

 are as in Mevoidium. The under side is nearly flat, the upper vei^y slightly 

 arched, the sides diverging slightly from the snout to the anterior quarter, from 

 there gradually converging to the extremely narrow and sharp-pointed hinder 

 end. Cytojilasm hyaline, homogeneous, transparent, allowing a clear view of 

 the bag-shaped pharynx with which are connected a minute c.v. and red stigma. 

 A single series of long thin paramylum rods along the upper side, much more 

 regular than is usual in this genus. 



Menoidium gkacile, n.sp. (PI. \aii., figs. 4, 5). 



Forma magna, eorpore gracili, arcuato, postice acuminato, fronte rostrato; 

 cytoplasmate plerunique granulato et bacillis araylaceis ornato. 



Long. 72 — 100, lat. 6 — 8; marg. infer, alt. — 12/i. Botanic Gardens, Syd- 

 ney (150) ; Lismore (225, 260, 350). 



Nearly twice as long as the type. Body well-arched, very slender, acuminate 

 but not acute behind, rostrate in front. Cytoplasm generally gi'anulate and with 

 a few paramylum rods in front. 



Mexoidium ixcurvum Fresenius. (PI. viii.. tig. 6). 



Syn. M. pellueidum var. inctirvum, Biol. Richmond River, p. 141. A very 

 small form and rare, though there were plenty in gathering 188 out of weeds 

 in the Richmond River. Broadest in front where it is abruptly truncate, with- 

 out rostrum, and very active in its movements, darting 'and twisting about in- 

 cessantly : there is very little in its appearance to connect it with this genus. 



Cf. Klebs, Organ, einig. Flag. ; and Daugeard, Recherch. s. 1. Euglen., p. 

 151, f. 46; the latter gives 25 X T/x as the size. 



Long. 16, lat. 5fx.. Lismore (188, 358). 



Menoidium tortuosum (Stokes) Senn. (PI. viii., tig. 7). i 



Syn. Atractonema tortuosum Stokes, Infus. U.S. p. 92, PI. i., f. 31. A 

 narrow spiral form, rostrate in front, acutely pointed behind; cytoplasm homo- 

 geneous, with a few paramylum granules or short rods. It moves in a spiral 

 manner, unlike other members of the genus, which either revolve slowly round 

 the long axis or hore their way through the water, rocking from side to side in 

 a manner peculiarly their own. 



Long. c. 22, lat. 5^. Stokes gives long. 'lO^^Ofx. Lismore (350, 365). 



Genus D i s t i G M a Ehr. 



DiSTlGMA PROTEUS var. CLAVATUM mihi. (PI. viii., fig. 8). 



Syn. Menoidium pellueidum var. clavatum Playf., Biol. Richmond River, 

 p. 142. Cf. Senn, FlageUata, pp. 177, 178, f. 128b. 



Long. 40—84, lat. 6— 12;ii. Lismore (187, 188. 365). 



Formae. (PI. ix., figs. 10—13). 



These forms have all the appearance of being a distinct species of Peranema, 

 but I believe them to be young forms of the preceding. 



Long. 18—44, lat. max. 8— 12;,x. Auburn (139); Pott's Hill (121); Lis- 

 more (258). 



