BY G. I. PLAVFAIR. 125 



versely. A short tail on the longer lobe. Membrane longitudinally striate, a 

 large paramyluni plate present, stigma distinct, Hagellum long. Very rare, but 

 numerous in certain gatherings. 



Phacus lismoren.si.s, u.sp. (PI. v., tig. 14). 



Phacus magnus, longe-ovatus, uno latere paullo intra apieem levissime 

 excavatus (deinde pharynge oriente ae flagello longo); sursum subacute rotun- 

 datus, interne sensim sensimque attenuatus et in caudam longam acutissimam, 

 oblique dispositam, protructus; membrana per longitudinem striata. A latere, 

 corpora liueari, arcuato; lateribus parallclis; postice eauda longaj ad angulo 

 recto defiecta. 



Long. Corp. 54, lat. 18; long. caud. -iOjj.. Lismore (2G0, 344, 348). 



A very distinct, well-marked species, known only from Lismore. The body 

 is tiat like a leaf, not lenticular; long ovate, rounded above, and gi-adually nar- 

 rowed below into a very long sharp-pointed tail set oblicjuely [in front view). 

 The opening of the pharynx is situated in a little indentation on one side at 

 some distance below the apex. From here also, of course, arises the long flagel- 

 luni. Membrane longitudinally striate; the chloroplasts small, oblong flakes lying 

 along the striae. From the side, the body is seen to be somewhat arched, the 

 sides parallel and close together, the tail set at right angles. 



Phacus pvrum (Ehr.) Stein. 



Eu(jleiia pi/ruiii Ehr. 1 have never come across the exact European tj'pe as 

 figured by Stein, T. xix., f. 51 — 54, and other authors; but the following forms 

 of it are found here and always retain their distinctive characteristics. 



Var. ovATU.s, n.var. (Pl. v., fig. 15). 



Forma corpore ovato fere ovali, sursum late-rotundata, interne attenuata, 

 Cauda brevi acutissima hyalina praedita. 



Long. Corp. 19, lat. 13; long. caud. G/i. Botany (142); Lismore. 



file type is somewhat narrowed above and excavated apparently lielow the 

 ajjex on one side. <Jur nearest form is quite rounded above, in shape like a 

 peg-top, slightly attenuated below, where it is furnished with a short hyaline 

 sharp-pointed tail. There are 6 or 7 coarse spiral c<jstae running from left to 

 right. 



Var. AU.STRALlcus milii. (PI. v., fig. lli). 



Forma ad v. ovatum accedens sed erassior, et eostis pluribus ornata. 



Long. Corp. 22—32, lat. 18—24, long. caud. 8—10^. Lismore (197, 242). 



Syn. Lepocinclis Steinii v. australica Playf., Biol. Richmond River, p. 141, 

 PI. viii., f. 0. A more inflated fonn of the foregoing, and with more numerous 

 costae which are rounded also, not sharp-edged. End \iew circular in both 

 forms. 



Var. RUDICULA, n.var. (PI. v., fig. 17). 



Forma corpore conico sursum truncato-rotundata, interne attenuata. lateri- 

 bus arcuatis; postice eauda brevi praedita. A latere valde compressa, lateribus 

 parallelis. 3Iembrana eostis rotundatis 4 — 7 ornata. 



Long. Corp. 24 — 35, lat. 15 — 26, long. caud. 14 — 18;t. 



Lismore (241, 258, 260, 285, 286). 



The type and preceding forms are circular in cross section; this form, on 

 the other hand, is strongly compressed. In shape conical, truncately rounded 



