104 W. B. TURNER, FRESH-WATER ALG/K OF KAST INDIA. 



punctata; sinn profimdo, angustissimo-lineari. A vertiee visum triangolare, lateribus 

 paullo incurvatis, angulis acuto-rotundätis. Zygospora globosa, aeuleis longis aeutis 

 basi conicis armata, circ. 6 in fascia marginali positis. 



Long. 22 — 24, lat, 20 — 22, lat. isth. 5.5 — 6; Zygospora e. aciili Hö, s. ac. 45 ,u. 

 T. XIII, f. 14 (after Wallicii Mscr. No. 277), X 300. 



Near to Stan. (Phyc.) depressum Näg. Gått, einz. Alg. t. VIII A, f. 1, hut larger 

 and punctate. 

 2. S. orbiculare, (Ehr.) Ralfs (Annals N. II. vol. XV, p. 152, t. X, f. 4, 1845; Br. Desm. 

 p. 125, t, XXI, f. 5; Desmidium orbiculare, Kur. Abh. Berit Akad. p>. 292, 1833; 

 Infus. p. 141, t. X, f. 9; Phycastrum orbiculare^ Kixz. Phyc Qerrri. p. 137, 1845; 

 Sp. Alg. p. 178; Goniocystis (Trigonocystis) orbiculare, Hassall Br. Fr. Alg. p. 349). 



1. Long. 28, lat, 24, lat. isth. 8 /u. 



2. 26, 26, » 7 ju-. T. XVI, t. 40, X 900; after Wallicii Mscr. No. 270. 

 Hab. 1. Northern India; 2. Raneegunge, July 18*55 G. C. W.; I have also seen 



a typical form ex Utrieularia fiexuosa from East Bengal, communicated by G. von L. 

 In the Indian speciraens the sinus is very narrow, the gerbieélls being elosely 

 adpressed. »Frond very mimitely punctate»», G. C. W. 



3. S. retusum, n. sj>. S. minus, tam longum quam latum, magnitudine variabili, truncato- 

 ovale; semicellula' depresso-ovatse, lateribus sub-acutis, angulis supcrioribus et basalibus 

 rotundatis; dorso retnsse; glalme?; sinu profundo, lineari, extrorsum parum atnpliato. 

 A vertit;e visum triangulare, partibus inedianis laterum leniter incurvatis, angulis acuto- 

 rotundatis. Massa ehlorophyllacea axilis, radiata, apud angulos divisa. 



Long. et lat, 20—30, lat, isth. 6.5—10 fi. T. XIII, f. 13, after Wallicii Mscr. 

 No. 271. 



4. S. depressum, Näg. (Fhycastrum depressum Näg. Einz. Alg. p. 126, t. VIII, A. f. 1, 

 1H49; aS. muticum f. minor, Lund. Desm. Suec. p. 56). 



Forma aperta, n. f. Fere ut in f. typica, sed sinu magno, äperto, interne ro- 

 tundato; major. 



Long. 26, lat. 25, lat, isth. 10 fu. T. XIII, f. 19, after Wallich Mscr No. 280 A. 



5. S. punctnlatum, BrÉb. (in Ralfs Br. Desm. p. 133, t. XXII, f. 1. 1K4S; Liste, p. 144). 



Long. 32, lat, 31, lat, isth. 10 ,u. T. XVI, f. 4. 

 34, » 32, » 10 ,«. 



The Indian forms are shorter and broader than the Fnglish speeimens of Ralfs, 

 their angles are also a little more acute. They approaeh a Spanish form Var. elliptica, 

 Fri. M. Levvin (Spanische Stissw. Alg. p. 9, t. I, f. 16), hut are more minutely punc- 

 tate. It is worthy of note that the arrangement of the granules (or puncta?) in this 

 species is by different authors variously given. In some the arrangement is depicted 

 as being irregular (e. g. Klebs Desm. Ost. Pr. t. Ill, f. 50, 51: Ralfs Br. Desm. t. 

 XXII, f. I c); in others (e. g. Lewin, 1. c.) the puncta are more or less vertical, and 

 in both views are oppositely ordinate to the angles; this is indistinetly shewn in Ralfs 

 (1. c. f. 1 b). Df, Toni in his Sylloge p. 1189 elasses this speeii'S under the section 

 »Semicelluhe granulis sparsis Ornatöe», it is not älways so! 



Bengal, G. C. W.; Fast India, from Utrieularia fascicultita', G. v. L. 





