KONGL. sv. VET. AKADEMIENS HANDLINGAR. BAND 25. N:o 5. 53 



— — f. minor. Long. 14, lat. 11, lat. isth. 3.5 ,«. T. X, f. 14. 



A little more than half the size of the larger form. 

 Northern India. 



30. C. lammen, Reinsch (1. c, sub No. 29, t. X, f. 1, a— e, h; t. XXII Bl, f. 1—12) 



forma acuta. Forma apice minns lata quam in f. typica. 

 Long. 28, lat. 21, lat. isth. 8 /'. T. VIII, f. 1*5. 



Fortasse E. retusi Perty (Bern. Mitth. p. 173, 1849; Kl. Lebensf. p. 208, t, XVI, 

 f. 12, 1852) forma la>vis? 



F. typica, B. minus, Reinsch, 1. c. Long. 17, lat. 13, lat. isth. 5 ,«. T. IX, f. 34. 

 Northern India. 



31. C. vittatum, n. sp. C. minns, late ovale, paullo longius quam latum; semicellulae fere 

 globosie, paullo depressa?, lateribus totis rotundatse; sinu lineari, extrorsum ampliato; 

 apieibus depresso-rotundatis. Membrana (a frön te) seriebus verticalibus (vel vittis) 9, 

 transversis 4, verrucarum ornata. A latere (et a vertice) non observatum. 



Long. 23, lat, 20, lat. isth. 7 u. T. VIII, f. 9. 

 Bengal; Central India, 



32. C. Willsianum, n, sp. C. minus, ovale; vix l7 2 -pl° longius quam latum; semicelluhe 

 eompresso-reniformes, lateribus et apice rotundatae; sinu profundo, lineari, externe 

 ampliato; membrana a fronte visa, gemmulis sphterieis in seriebus verticalibus 5, trans- 

 versis circ. 10, ornata, et basi serie (versus isthmum) in quaque semicellula verrucarum 

 instructa, A vertice visum perfecte ovale. 



Long. 33, lat. 25, lat. isth. 8 «. T. VIII, f. 1!». 



The peculiar geminulation with the basal series of elongate verrucse separate this 

 distinctlv. I dedicate this to my friend A. W. Wills, in token of esteem and of his 

 work on the Desmidieae. 



This form somewhat reseinbles C. tumidum Lind., Desm. Suec. p. 45, t. III, f. l(i, 

 but differs in the granules being regularly disposed and in the vertical view not being 

 eentrally tumid; also in the basal verrucae. 



33. C. hoinalodermum, Nordst. (Desm. Aret. p. 18, t. VI, f. 4; C. 'pyramidatum f. inter- 

 media, Nordst., Norg. Desm. p. 19) fi rotundatum Wille (Fersk. Nov. Semlja, p. 36, 

 t. XII, f. 18) forma. 



Long. 40, lat. 26, lat. isth. 8 fi. T. VIII, f. 23. 



( >n this I observed no puncta, but they are often indistinct. The membrane is 

 inc rassate at apices. 



Forma typica. Long. 55, lat. 44, lat. isth. 17 ,//. T. VIII, f. 62. Reinsch (Alg. 

 Proin. Bona 1 Spei, p. 240, 1877) considers Nordstedts species = C. Hammeri B inter- 

 medium ejus; the front view is certainly like, but the vertical and lateral views seem 

 to me to separate t hese forms. 



34. C. isthmochondrum' Nordst. (Norg. Desm. p. 12, f. 2) />' achondnim, n. v. Var. minor, 

 fere ut in f. typica, sed seriebus marginalibus 3 (non 2) granulorum ornata; centrali 

 parte frondis (et isthmo) laevi, nullis granulis instructa. 



Long. 23, lat. 18, lat. isth. 6 ». T. VIII, f. 10. 



