870 Conjugatse, Desmidiacete, Triploceras. 



Maskell var. superbum Maskell On a new variety of Desmid et 

 in Notarisia 1887, p. 340: gracile, elongatum, cylindraceum, 

 625 =; 50, medio leniter depressulum ; prominentiis lateralibus seg- 

 mentorura subinde tridentatis, dente mediauo majori; e fronte vi- 

 sum inter prominentias ad interiorem partera leniter curvulum, 

 segmenta transverse pluries annulato-dentata prrebens; processi- 

 bus parvis (basi prominentiae terminalis tridentafae sitis), subtiliter 

 apice acutatis, uec triapiculatis, processibus terminalibus 2, sub- 

 rectangularibus, tridentatis; endochromate virescente. Ad cc Wai- 

 nui-o-mata )) pr. uWellington » (Maskell) nec non ad (( Orakeiko- 

 rako, Paeroa» in Nova Zelandia (S. Berggren). — Sec. Nordstedt 

 a forma genui.na Ttnploceraiis verticillaii differt cellulis crassio- 

 ribus diametro tantum 7-8-pIo longioribus, semicelkilis saepe non 

 plane cylindricis sed leviter tumidis, verticillis prominentiarum 

 circ. 11-15, prominentiis verticilli circ. 12-16 bidentatis vel itife- 

 riorum sa^pe tridentatis (infiuii ceteris subduplo majore, 2-4-den- 

 tata vel biloba) dente su[)eriore vel intermedio adscendente, acu- 

 tiore ceteris vulgo paullo majore, lobis apicalibus [2-] 3-4 apice 

 bi-quadri-aculeatis. Specimina a Berggren lecta prajbent. long. 

 500-650 p.., lat. ad bas. 66-74 ^j.., ad med. semic. 72-80 [j.., lat. isthra. 

 46-54 a., lat. apic. sin. acul. 56-68 p.., crass. prom. 8-10 ^;.. = long. 

 prom. [Forma genuina Bail. I. c. tab. 1, fig. 9: long. 443 u., 

 crass. 38 p.. = lat. apic. s. sp. ;Turner Not. Fr. Alg. pl. 1, fig. 2: 

 long. semic. 340 p-., lat. 46 p.., lat. apic. s. sp. 76 p.]. 



2. Triploceras gracile Bail. Micr. Observ. p. 38, t. I, f. 10, Archer 2097 

 in Micr. Journ. 1805, t. VI 1, f. 1, WoIIe Desm. U. S. p. 53, t. X, 

 f. 3, 6-8 Nordst. Freshw. Alg. of N. Zeal. and Austral. p. 64, t. 7, 

 f. 12, Docidium Prisiichv Hobson in Mag. of Nat. Hist. V, p. 168, 

 Micr. Joiirn. 1863, p. 169 cum icone, Pleuroicenium gracile Ra- 

 benh. FI. Eur. Algar. III, p. 144, Docidium graci/e Wittr. Skand. 

 Desm. p. 21, t. I, f. 10. — Differt a priori gracilitate (20-28 [j.., raro 

 ultra latum) et prorainentiis angustioribus et obtuse rotundatis et 

 acutis. 



Hal>. \n iisdem cura antecedente locis Americre, Indiae, Novse 

 Zelandia?. — Subsp. aculeatum Nordst. Freshw. Alg. of N. Zeal. 

 and Austral. p. 04, t. Vll, f. 13-14, in Bot. Notiser 1887, p. 163 

 et in Notarisia 1888, p. 411: a typo differt prorainentiis semicel- 

 lularum verticiilatis rotundatis in aculoura adscendentem (vel in 

 parte inferiore semicellularum interdum patentissirais) productis, 

 lobis apicalibus paullo inagis productis et divergentibus. Ad u Taupo 



