KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 8. 55 



The slight inflation does not project exactly in the vertical middle line of the semi- 

 cells, but very near to it. In end view the 2 projections are not qnite opposite to each 

 other, but one of these to the right, the other to the left. — Dr. J. Schaarschmidt makes 

 no mention of the asymmetrical position of these projections. 



19. C. variolatum Lund. Desm. suec. p. 41, tab. 2, tig. 19. 

 (i extensum nov. var. Tab. 6, flg. 3 a. 



Majus; longitudo cellute praj latitudine major. 



Long. 54—67 ,«; lat, 34— 38 ,u; lat. isthm. 16—18 ,«; crass. 30 ,«. 



Omatangi (248, 251, 252, 253); Tongariro et Ruapehu (280). 



Forma eompressa. Cellulse e latere visee lineares lateribus parallells, medio con- 



stricta?, apicibus rotundatre c. 21 — 23 u crassa 3 . Tab. 6, fig. 3 e. 



Ad Waikato river (237, 238). 



Nonnulla alia specimina ex Arthur Pass (17) fortasse hane ad speoiem pertineant. Long'. 48 — 54 jit; lat. 

 28—32 /x; crass. 22 fl; lat. isthm. 8—12 //. 



20. C. genuosum nov. spec. Tab. 6, fig. 4. 



C. latitudine circiter duabus partibus vel subduplo longius, medio profunele eon- 

 strictum, sinn lineari angnstissimo; semicellula? e basi recta usque ad medium requali 

 latitudine (vel fere), lateribus rectis vel nonnumquam levissime retusis, ab hoc loco angu- 

 statse lateribus levissime convexis vel concavis, apice lato tfuncatse parva excavatione me- 

 diana (vel lobulis excavatione ortis paullo oblique truncatis), angulis sa?pe rectis; a latere 

 oblongo-ovata; ; e vertice visa? compresse-elliptica? ; nuclei amylacei singuli. Membrana 

 eminenter punctata vel pustulata (fere ut in Cosm. variolato). Latitudo isthmi fere dimi- 

 dium, crassitudo fere duae partes diametri transversalis cellula?, latitudo apicis latitudinem 

 isthmi paullo major. 



Cosmario subquadrato Nordst. proximum pra?cipue differt apice latiore truncato 

 medio excavato. 



Long. 53—62 ,u; lat. 29— 32 ,«; crass. 20,«; lat. isthm. 13 — 16, «; lat, apic. 15—18//. 



Taupo (159, 160). 



21. C. quadratum Ralfs Brit, Desm. p. 92, tab. 15, fig. 1 a et b. 



Forma major ut videtur cum f. suecica in Lund. Desm. suec. p. 47 commemorata 

 identica. (Apices interdum medio quam levissime retusi). Tab. 6, fig. 5. 



Long. 60—62 /u; lat, 37—38 ,u; lat, isthm. 20—27 ,«; crass. 28 ,«. 



Dunedin (26). 



Alite forma? minores magnitudine ad fig. in Ralfs Brit, Desm. accedentes, habitu 

 priori similes sed istmo angustiore, fortasse huc pertineant, sed numero nucleorum amyla- 

 ceormn in semicellula ignoto determinatio incerta fit, 



Long. cell. 36—43 ,«; lat, 20—24 ,u; lat, isthm. 10—11 ,u. , Waikato (238); Oma- 

 tangi (240). 



Long. 55 ,«; lat, 30 — 32 ,«; lat, isthm. 15 — 16 k- Ohaeawai (120). 



