Acta Societatis pro Fauna et Flora Fennica, 49, N:o 7. 41 



sinuato-convergentibus, angulis omnibus rotundatis, basalibus 

 spinulam minimam gerentibus. Membrana supra centrum 

 ocello (= eminentia parvula scrobicula perforata) ornata, 

 supra isthmum autem glabra. Long. 21, lat. 14, crass. 9, 

 isthm. 4 (i. [N:o 1018]. — Compare also C. trilobulatum and 

 its varieties. 



Hab. (SW?), leg. Elf v. — PI. 7 fig. 45—46. 

 C. angulare Johns., New rare desm. I pi. 211 f. 14, 

 var. bicostatum, nova var. Semicellulae, ut in typo sub- 

 trapeziformes, margines autem angulis pluribus et plus 

 obtusatis, anguli basales submucronulati. Membrana medio 

 costis seu iugis depressis binis longitudinalibus ornata. A 

 latere visae semicellulae subcirculares; a vertice visae latius 

 ellipticae medio utrimque papillis parvis (= costae a fronte!) 

 binis conspicuis. Long. 30, lat. 27, crass. 19, isthm. 8 fi. 

 [N:o 1031]. 



The size and general appearance agree well with the 

 type, but the angles are less edged and there are three 

 lateral sides. The vertical view is considerably broader 

 than Johnson's figure, but this is probably somehwat 

 exaggerated if one may judge from the breadth in front 

 view and the thickness in side view! — Compare also C. 

 sulcatum Nordst. f. West, Madagasc. pi. 9 f. 29 and 

 C. rectangulare var. australe PI ay fair, Polymorph, pi. 13 

 f. 15 — 16, which both possess an open sinus and a different 

 outline. 



Hab. Near Abo (SW), leg. Elfv. PI. 7 fig. 42—44. 

 C. obsoletum (Hantzsch) Reinsch; West, Mngr. 

 II p. 133—134 pi. 56 f. 1—3. - Long. 42, lat. 51, crass. 26, 

 isthm. 21 ft. [N:o 1051]. 



The size and the outline are in agreement with the 

 description by West, whilst the cell-wall is coarsely porose- 

 scrobiculate as in the large tropical forms. Also the cone- 

 shaped „pore" or „spine" at the basal angles was always 

 present, and the cell-wall is always double, the outer one 

 being quite hyaline. (Cfr. Gut win ski, Alg. Java pi. 38 

 f. 39—40). Our figure, which is made from a cell prepared 



