KOXGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 25. N:0 5. 55 



The latter is so distinct from the type that it might, with propriety, be classed 

 as a new species, Cos. Klebnanum, \<>b.? 



39. C. exiffiiuni, Archer (in Q. J. Micr. Sci. p. 178, t. VI, f. 32, 33, 1864) f. minor. 

 Funna minor, modice eonstricta, apicibus semicellularum perfeete semicircularibus. 



Long. 21, lat. 11, lat. isth. 5 ". T. VIII, f. 18. 



The Indian forms are almost exactly those figured by Wolle (Desm. U. S. A., 

 p. 66, t. XVI, f. 13, 14), having much inore regularly rounded ends than in Archer's 

 figure (a fronte). 



40. C. armillatuin, n. sp. C. minus, paullo longius qnain latnin; semicellula* snb-renifornies. 

 dorso valde convexa?; incisura mediana ampla, interne rotundata; membrana granulata, 

 granulis in series verticales 4, transversas 10, ordinatis. 



Long. 20, lat. 17—18, lat. isth. 6 u. T. VIII, f. 22. 



Near to C. sphalerostichum Nokdst. ft Brasiliense, Wille (Sydam. Algfl. p. 15, 

 t. I. 1". 30), and C. orthostickum J pumilum, Lund. (Desm. Suec. p. 25, t. II, f. 10), 

 but differs in the very rotund semicells, the isthmus and the arrangement of the 

 granules. 



41. C. Aitchisonii, Schaarsch. (Afghan. Alg. in J. Linn. Soc., Bot., XXI. p. 246, t. V, f. 20. 

 1884; C. monodentatum, W. Ii. T. in litt. 1884). 



Long. 30—33, lat. 21—23, lat. isth. 8. crass. 14 .«. T. VIII, f. 54. 



Vav. punctatum. Dense subtiliter punctata. 



Long. 32, lat. 20, lat. isth. 8 «. T. IX, f. 18. 



In this species I find the apices often incavate, or sub-emarginate, as in ng. 54; 

 in Schaarschmidt's form they are broadly rotund as in fjg. 18. 



The former might be considered to be a Euastrum, it might therefore stånd as 

 En. monodentatum, and the latter as />' punctatum of C. Aitchisonii. 



42. C. bidentatuni, n. sp. C. parvum, sub-hexagonum, vix l' 2 -plo longius quam latins; 

 semieelluhe sub-trapezicae, sursum angustataé, dorso late rotundata', angulis inferioribus 

 acuto-rotundatis vel rotundatis: sinu profundo, lineari, extrorsum ampliato; membrana 

 la?vi; semicellnlis apicem versus dentibus coriicis duobus munitis. 



Long. 30, lat. 22. lat. isth. 6.5 ,u. T. VIII, f. 24. 

 Nea rest to the preceding species. 



43. C. laciniatmn. n. sp. C. parvum, circ. 5-ta parte longius quam latnin, late ovale; semi- 

 cellula- rotundo-trapezica?, basi dilatatae, rotundata?, apice truncatae; incisura mediana 

 profunda, lineari, externe ampliato; semieelluhie marginibus minute crenatis crenis 22 — 26; 

 membrana achroa, medio laavi, margines versus seriebus duplicibus granulorum minu- 

 torum binorum concentriee positis (2 granula crenae opposita). A latere et a vertice 

 visa non observata. 



Long. 17. lat. 14, lat. isth. 5 ju. T. VIII, f. 26. 



44. C. teneram, u. sp. C. minutum, fere longius quam latins, depressum; semicellula? de- 

 presso-ovatae, lateribus rotundata 1 . dorso leviter convexaa; sinu lineari extrorsum ampli- 

 ato; membrana achroa, apud margines serie granulorum (vel punctorum) minutorum 

 instructa. 



Long. K», lat. 11, lat. isth. 5 ,«. T. VIII, f. 27. 



