KONGL. SV. VET. AKADEMIEKS HANDLINGAR. BAND. 22. N:0 8. 63 



47. C. amplum nov. spec. Tab. 6, fig. 20. 



?C. margaritiferura Mask. N. Z. D. tab. 12, fig. 28; cfr. N. Z. D. Add. p. 251. 



C. (Pleurotseniopsis?) sinu angusto sublineari cxtrorsum et introrsum ampliato pro- 

 funde constrictnm; semicellulse tres partes cireuli efficientes (apice interdam paullalo trun- 

 'catse), membrana granulis minöribus in series horizontales 17 — 20 et oblique transversas 

 (c. 23) quincuncialiter ordinatis dense obsessa?, in ipso apice ssepe granulis tiullis; a latefe 

 circulares; a vertice late ellipticae membrana in centro punctata, ceterum granulata, Nuclei 

 amylacei? (Tantum c'é'1'Iulse inanes colore luteo-fuscescente a me viste snnt.) 



Habitu C. tetraophthalmo proximum praécipué differt granulis minöribus densioribus 

 alio modo ordinatis (et laminis chlorophyllaceis?). 



Cosmarium eonspersum [i attenuatum Nordst. Desm. Brås. p. 208, tab. 3, fig. 20 

 quoque affine est, sed minus angulis semicellularum inferioribus rectis, granulis in series 

 horizontales et verticales dispositis. 



Long. 108—120 ,«; lat, 76—86 ,«; crass. 54—60 ,«; lat. isthm. 32—34 ,«, 



Taupo (154, 157); Tokano (209, 210); Omatangi (248); Tauranga (305—307). 



At times the granules have not at the base appeared eircular, but indistinctly 

 hexahedrical. 



Forma trigona. Tab. 6, fig. 21. 



Semicellula? e vertice visa 1 triangulares angulis rotundatis, lateribus levissime con- 

 vexis. Tantum una semicellula a me visa est, Lat, 88 ,u; long. semic. 74 ,«. 



Tarawera Lake (308). 



48. C. turgidura Bréb. in Ralfs Brit, Desm. p. 110, tab. 32, fig. 8. 



Long. 192—220 v; lat, 92—100 ,»; lat, isthm. 70—74 ,«. (Laminfe chlorophylla- 

 cea^ 8). 



Orakeikorako (293, 299). 



fi ovatum nov. var. Tab. 7, fig. 30. 



Semicellula? ovata^ sursum magis attenuata: 1 quam in «, apice obtuso-rotundata?. 

 (Lamina? chlorophyllaceae non visa'). 



Long. 190—200 ,«; lat, 90—96 ju; lat, isthm. 70—74 ,«. 

 Kororareka (100). 



Gen. 15. Triploceras Bmley Micr. Obs. p. 37; char. emend. 



1. verticillatum Bail. * superbum (Mask.) Nordst. mscr. (Triploceras tridentatum 

 Mask. (i superbum Mask. Var. Desm. p. 325 cum fig.; char. emend.). Tab. 7, fig. 3 — 11. 



A forma genuina Tv. verticiliati differt cellulis crassioribus diametro tantum 7 — 8-plo 

 longioribus, semicellulis sa a pe non plane cylindricis, sed leviter tumidis, verticillis promi- 

 nentiaruin circ. 11 — 15, prominentiis verticilli circ. 124-16 bidentatis vel inferiorum srepe 

 tridentatis (infimi ceteris subduplo majore, 2 — 4-deiitat.a vel biloba) dente superiore vel 



