KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 25. N:() 5. 49 



does resemble Bréb.'s plant, which is a Dysphinctium, but it is much less, and the 

 suture and side view differ. 

 9. C. maculatum, n. sp. Cos. inajus; late ovale, circ. duplo longins quam latius; semi- 

 cellulae angulis inferioribus rotundatis; apicibus late rotundatis; membrana tenui, dense 

 et graviter punctata; sinn brevi, aperto, interne rotundato, extrorsum paullo ampliato. 

 A vertice visum late ovale; a latere bi-ovale; distincte constrictum, paullo compressum. 



Long. 145— 160, lat. c. 75, lat. isth. 47, er. circ. 48 ,«. T. VII, f. 31. 



Forma. Levissime punctata. T. VIII, f. 68. 



Long. 145 — 155, lat. 70—80, lat. isth. 46—48 ,«. 



This form is near to ('. pseudo-pachydermum Nordst. (Fr. Alg. N. Z. p. 53, t. V, 

 f. 20) but differs in being more slender, and having rotund apices, the sinus also is 

 open, not linear. 



10. C. tamescens, n. sp. C. permagnum, vix duplo longins quam latius, late ovale; modice 

 constrictum, sinn mediocre, aperto, extrorsum ampliato; semicellulae late conicae, angulis 

 inferioribus subito rotundatse, apice truncato-rotundatae. Membrana crassa, subtiliter 

 punctata. A vertice late ovale, a latere elliptico-orbiculare. Species inter C. pachy- 

 dermum Lund. (Des. Suec. p. 39, t. II, f. 15) et C. ps.-pachydermum Nordst. (vide No. 9). 



Long. 14-2—15.3, lat. 78—84, lat. isth. 52, er. circ. ÖG ,«. T. VII, f. 32. 



[The true C. pachydermum Lund. was noted by Roy, from the Himalayas, 1882.] 



11. C. panduriforme, n. sp. C. mediocre, circ. duplo longins quam latius, ovale; medio con- 

 strictum, sinn lineari, brevi; sernieellulae pyramidales, angulis inferioribus subito rotun- 

 data\ fere rectse; lateribus leniter curvatse, apicibus acuto-rotundatse. Membrana achroa, 

 minute punctata. A vertice latissime ovale, fere circulare; a latere ovato-lanceolatum, in 

 medio paullo constrictum, fere ut in Diatoma Navicula panrfura Bréb. (Diat. Littoral 

 Cherbg. p. 253, f. 4, 1854). Massa chlorophyllacea centralis? in taeniis irregularibus 

 disposita. 



Long. 90, lat. 43, lat isth. 28, crass. 29 ,« (fide Wallich, Mscr. No. 143). 



Tab. IX, f. 3. C. ps.-pyramidato Lund. *stenonotum Nordst. in Nordst. et 

 Wittr. (Desm. et (Edog. p. 32, t. XII, f. 8) prope, sed differt apice, et a laterale et 

 vertice visum; etiam inter C. javanicum Nordst. (De Alg. nonn. p. 7, f. 10) et C. 

 Ralf*// (] angulosum Racib. (Des. Kräk. p. 15; Desm. Nov. p. 15, t. I, f. 6). 



12. 0. Boldtii, n. sp. C. minus, paullo longins quam latum, ovato-depressum; incisura 

 mediana sub-profunda, lineari, extrorsum ampliata; semicellulie sub-semicirculares, apice 

 paullo depressae; margine crenatae; seriebus 5 verruculis conicis concentricis ornata»; 

 centro non tumescentes. Fröns in centrali parte laevis. 



Long. 14.5, lat. 12, lat. isth. 5 ,u. T. VII, f. 24. 



Clo. Roberto Boldtio hane speciem dedicavi. C. Haaboeliense Wille (Norg. Fersk. 

 ]>. 25, t. I, f. 6) prope, sed differt in granulis, in margine, et semicellulis non tumidis- 



13. C Regiiellii, Wille (Sydam. Algfi. p. 16, t, I, f. 34) forma? evolutae. Fere ut in f. tv- 

 pica, sed semicellula? in centro paullo tumidae, et papilla instruetae. 



a. major. Long. 19, lat. 19, lat. isth. 6, er. 8.5 u. T. VII, f. 26. 



b. minor. » 13, » 12.5, » » 4, » 5.7 «. » » » 25. 



Also Wallich, Mscr. No. 153. 



K. Sv. Vet. Aka.1. Handl Band •.'."). N:o .'>. 7 



