BY G. I. PLAYFAIR. 605 



Cl. lunula Ehr. j3 giganteum (Bernard). (Plate xi., fig.2). 



CI. giganteum Bernard, Protococc. et Desm., PI. iii., fig.71, 



Forma maxima, ab omni latere visa fusiformis. Semicellulse 

 conicse, sensim sensimque a sutura attenuatse lateribus levissime 

 eonvexis fere rectis, apicibus obtusis rotundato-truncatis. Mem- 

 brana achroa glabra. Endochroma in laminas longitudinales 18 

 (visis 9-10) ordinata, zona mediana pellucida instructa et vesiculis 

 terminalibus, nucleis amylaceis permultis diffusis. 



Long. 650-1040; lat. 115-145^ 



Auburn (10, 21). 



Gathered out of some heads of weed from a small pool at 

 Auburn in great quantity. The shape is as if two fool's caps 

 had been joined together at the rims. The dimensions have the 

 same range as those given by Nordstedt for New Zealand speci- 

 mens of a typicum. Judging by the figures of Ralfs, Klebs, and 

 Cooke, our forms of Cl. lunula differ a little from European, 

 specimens in always having the extreme ends subtruncate and 

 not pointed. Before seeing Bernard's work I had this form 

 arranged as /3 fusiforme of Cl. lunula, to which species I would 

 certainly refer his Cl. giganteum. 



Cl. praelongum var strigosum (Breb .)(?). (Plate xi., tig. 3). 



Cl. angustum, elongatum, leniter curvatum, dorso modice con- 

 vexo, ventre subrecto, sciagraphia ad Cl. Hneatum accedente. 

 Semicellulse gradatim attenuatce, ad polos versus rapide angustatse 

 et leviter dejecta?, apicibus truncatis subacutis, nonnunquam 

 levissime renexis. Membrana glabra, aequaliter dilute rufescens, 

 striis nullis, suturis evidentibus nonnunquam 2-3. Endochroma 

 in laminas longitudinales 6 disposita, nucleis amylaceis 15-16 in 

 quaque semicellula, vesiculo centrali circulari, terminalibus 

 minimis. 



Long. 375-516; lat. 16-24; lat. apic. circ. 6; alt. ad dors. 42/*. 



Auburn (10, 16), Coogee (4, 13). 



I have not access to Brebisson's work, but the shape and size 

 answer very well to those given by Delponte (p. 205, T. 18, f.3) for 



