L34 W. B. TURNER, FRESH-WATER AI. (..K OF KAST INDIA. 



Nonne Stauraslrum Dickiei IIai.fs forma 2-gona? T. XI, f. 28. 



3. A. minor, n. sp. A parvus, bi-ovalis; sinu profundo acuto externe valde aiujbliato; 

 membrana glabra; semicellulis ovalibus utroque latere media spinula brevi acufa hori- 

 zontaliter posita munitis. A vertice visum ovalas apicibus paulk) acuto-rotundatis. 



Long. 21, lat. s. sp. 20, c. sp. 24, lat, isth. 5, crass. 10, 1. sp. 2 /u. T. XI, f. 2i). 



4. A. crispus, n. sp. A. major, sub-quadraticus; semicellulis cuneatis, åorso truneatis vel 

 leniter incurvatis, e basi snperne inflatis; valde eornutis; eornnbus angulis superioribus 

 positis, erassis attenuatis incurvo-recurvatis apice sub-acuitis; sinu brevi rotundato; raera- 

 brana glabra. A basi visns compresso-ovalis, lateribus fere plands. 



Long. 48. lat. s. corn. 44 — 46, c. corn. 90 — 94; lat. isth. 15; crass. 22; long. 

 corn. 22— 2b' /u. T. XI, f. 30. 



5. A. liiatus, n. sp. A. mediocris, late ovalis, magis eonstrietus, sinu cuneato-triangulari 

 valde aperto; semicellulis dolabriformibus externe rotundatis e basi divergentibus mar- 

 gine rectis vel paullo sinuatis; membrana glabra. Angulis lateralibus aeuleis brevis 

 acutis rectis 4 instruetis, deorsum positis. A vcrtice visum ellipticus apicibus sub- 

 aoutis. Formas: 



f. major. 



Long. 37, lat. s. ac. 44—46, c. ac. 50—56; lat. isth. 8 — 9; long. acul. 3— (i ju. 

 T. XI, f. 40; XII, f. 1, c. semic. juv. 

 f. minor. 



Long. 28, lat, s. ac. 32, c. ac. 36; lat. isth. 10, long. ac. 1.7—2^. T. XI, f. 34. 

 Is it possible that f. 28 is a rotund and compressed form of this? 



6. A. convergens, Ehr. (Inf. p. 152, t, X, f. 18, 1838; Hassall Br. Fr. Alg. p. 357, t. 

 85, f. 9; Staurastrum convergens Mexgh. Synops. p. 228; Ralfs in Annals X. II. v. 

 XV, p. 158, t. XII, f. 1; Euastrum convergens, Kltz. Phyc. Germ. p. 136). Fornne: 



a typica. 



Long. 38—48, lat. s. acul. 40—44, c. acul. 50—64, lat, isth. 13—15, crass. 21 

 — 23, 1. ac. 6 — 12 /u. Z)gospora ovalis, membrana crassa glabra, diam. 54 X 44 ^, 

 G. C. W. 1855! T. XII, f. 3, sec. G. C. W.; XI, f. 42. 



Bengal, G. C. W\; Kast Bengal, ex Utricularia fiexuosa, G. vox L. 

 ft curta. F. curta, compacta, sjnnulis brevioribus. 



Long. 35—42, lat, s. ac. 34—40, c ac. 48—53; lat. isth. 13, crass. 20—21; 

 long. ac. 4—5 ju. T. XI, f. 32 (a after G. G. W. Mscr. No. 172). 

 / minor. 



Long. 33, lat, sin. ac. 36, c. ac. 54; lat. isth. 9, crass. 16, long. spin. 9 /'. T. 

 XI, f. 41. 



The Zygospore of this species, first ngured by Cleve (in Ltndkli. Desm. Suec. 

 t. III, f. 22], was noted by Wallicii in India, 1855. In t. XI, f. 32 a, is a facsimilc 

 from Wallicii showing the »swarming of the granules», be says the chlöröphyll-mass 

 shriink up to about Vs °f its original bulk, occtipying the eentre of segment, whilst 

 ihe motile granules yere collected into 2 cells (inlra-cellular spaces) one on each sidc of 

 the endochrome. They are at this stage evidently containcd in distinct capsulea, two 

 in each segment; the endochrome (in the eentre) having its distinct envelope . This 



