KONGL. SV. VET. AKADEMIENS HANDLINGAR. RAND. 22. N:0 8. 57 



25. C. obliquuiu Nordst. Sydl. Norg. Desm. p. 23, tab. 1, fig. 8. 



(Celluke e verticaa visa interdum fere trigonse). 



Long. 14—16 ,u; lat. 12 ,«. 



Arthur Pass (17); Omatangi (253, 256, 259); Ruapehu & Tongariro (280). 



26. C. norimbergense Reinsch Spec. gen. nov. Alg. Fung. p. 117, tab. 3, fig. A. IV. Forma. 

 Long. 16 ,"; lat. 10 /u; lat. isthra. 6,5 /u. 



Tokano (210). 



The few specimens of this form which I have met with, had their end view elliptic, 

 not oblique as in C. obliquum, but the constriction at the middle of the cell was not so 

 great as in C. norimbergense f. genuina. The figures by Reinsch 1. c. are less constricted 

 at the middle than they are in Algenfl. Frank. tab. 9, fig. II. C. obliquum may perhaps 

 be regarded as a forma obliqua of C. norimbergense, and C. laticeps Grun. as a forma 

 angustior e vertice ventricoso-inflata (Cfr. Algfl. Fr. tab. 9, fig. 2 c & d). For the sake 

 of comparison I add a fignre of C. laticeps, received from Dr. L. Rabenhorst. Tab. 6, fig. 10. 



27. C. sublobatum (Bréb.) Arch. in Pritch. Infus. p. 731; Euastrum? sublobatum 



Bréb. in Ralfs Brit, Desm. p. 91, tab. 32, fig. 4. 



Ii brevisinuosum nov. var. Tab. 6, fig. 9. 



C. a latere et fronte visum cum subspec. dissimili Nordst. (Desm. ital. p. 39, tab. 

 12, fig. 15) magnitudine et habitu fere prorsus congruit (sed differt sinu interdum non 

 lineai'i sed mox dilatato, unde anguli inferiores magis rotundati evadunt); semicellula j a 

 vertice visse apicibus subtruncatse, a basi apicibus rotumdåtse, medio late tumida 3 . 



Long. 23 — 26 ,"; lat. 14 — 18 ,«; crass. 12,«; lat. isthm. 8 — 11 ,"; lat. apic. 13 — 14,". 



Omatangi (253, 256, 257, 259, 262, 266). 



28. €. trilobulatum Reinsch. Spec. gen. nov. Alg. Fung. p. 118. 

 (i basichondiMim nov. var. Tab. 6, fig. 1 1 . 



Semicellute lobis apice retusis, ad isthmum granulo singulo (vel potius elevatione parva). 

 Long. 26—31 ,/<; lat, 17—21 /u\ lat, isthm. 6—7 /u; lat, apic. 12—14 ( »; altitud. 

 apic. 6 — 8 /<; crass. 11 — 13 ,«. 

 Omatangi (240, 248). 



29. C. venustum (Breb.) Arch. in Pritch. Inf. p. 732; Euastrum venustum Bréb. 



List. Desm. p. 124, tab. 1, fig. 3. 

 fi induratum nov. var. Tab. 3, fig. 13. 



Semicellula? interdum e medio ad basin versus paullnlo angustata^, membrana in 

 centro excavatione nulla prtpdita, sed incrassata praecipue in latere interiore. 

 Long. 22 — 24 ,«; lat, 16 — 17 </; crass 12 «. 

 Arthur Pass (17). 



K. Sv. Vet. Akad. Hanrtl. Bil. 22. N:o S. \ O 



