KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 25. XtO 5. 41 



7. D. connatum (Bréb.) Retnsch (Cosmarium connatum, Bréb. in Ralfs' Br. Desm. p. 108, 

 t. XVII, f. 10; Dysph. connatum, Reixscii, Algenfl. p. 178, 1867; Dysph. Meneghini- 

 ahum, Näg. Einz. Alg. p. 112, t. VI G, f. 2, 1849; Calocylindrus connatus, Kirchn. 

 Mg. Schlesiens, p. 143, 1878) f. laeve. 



Fere ut in f. tvpica, sed membrana non pnnctata. 



Long. 66—70, lat. 50— 54, lat. constr. 46—48 ,«. 



T. VII, f. 6. 



This form is a little smaller, and the sinus more open, than in the type. 



8. I). monile, n. sp. D. minus; fila formans; circ. l7 2 -plo longius quam latins, sub- 

 globosum. Semicellula' rotuiidatae, medio leviter constrictse, sinu incurvatse; utraque 

 semicellula nucleo amylaceo singulo instructa; massa chlorophyllacea versus polos fissa. 

 A vertice visum circulare. 



Long. 22.7—24.5, lat. 15 — 16, lat. constr. 9.5—11 ,w (after Wallich Mscr. No. 97). 



T. VII, f. 13. 



»This species shows a constant inclination to assume the filamentous form.» G. C. W. 



9. D. retusum, n. sp. D. minimum, l 1 /, — l 3 / 4 -plo longius quam latum, sub-globosum; 

 semicellula' globosa?; sinus rotundatus; membrana Isevis, tenuissima; a vertice visum 

 circulare. 



Long. 14 — 16, lat. 9, lat. eonstric. 7 ,«. 

 T. VII, f. 10. 



Cos. globoso, Bulnheim (in Hedwigia, Bd. 2, p. 52, t. IX, f. 8, 1861) consimile 

 sed multo minor. 



10. D. heterodoxum, n. sp. I), parvum, circ. l 3 / 4 -plo longius quam latins, ovale, senri- 

 cellulis sub-hemisphsericis, basi granulis (in lineam positis) instructis; sinu sub-acnto, 

 breve. A vertice visum circulare. Membrana Isevis, sub-crassa. 



Long. 28—30, lat. 16, lat. constr. 12 {i. T. VII, f. 15. 



Yar. ornatnm. Semicellula 1 annulis duplicibus concentricis punctatis vel granulis 

 ornatse. T. VII, f. 14. 



The smooth form might possibh^ be mistaken for I), dubium (T. I, f. 1, 2), but 

 the basal puncta (granules?) separate it from that form. 



11. D. aspersum, n. sp. D. mediocre, circ. l x / 3 -plo longius quam latins, medio modice con- 

 strictum; sub-globosum, semicellulis late rotundatis; sinu sub-acuto, interne rotundato; 

 sutura laevi. Membrana crassa, granulis magnis in obliquas series ordinatis. A vertice 

 visum rotundatum vel late ovale. 



Habitu D. connato proximum. 

 Long. 66, lat. 48, lat. constr. 35 /u. 

 T. VII, f. 16. 



12. D. Cohnii (Kirchn.) Non. {Calocylindrus Cohnii, Kirch. Alg. Schles. p. 142, 1878) var. 

 regulare, n. v. Longe ovale; a vertice late ovale, a latere paullulum compressum, 

 apicibus paullo depressis. Membrana verrucosa, nodulis in seriebus obliquis instructa. 

 Minor quam f. typica. 



Long. 94—102, lat, 50—56, lat. constr. 42—44, crass. circ. 40 /u. 

 T. VIII, f. 39. 



K. Sv. Vet. Akad. Ilaii.1l. Band. 35. N:o 5. C, 



