86 W. B. TUBNER, FRESH-WATER ALG^E OF EAST INDIA. 



53. E. Webbianum, n. sp. E. variabile, habitu a fronte E. ansa to Delp. (Desrn. Sub-alp. 

 t. VI, f. 31, non Focke, nec Ralfs) consimile, sed sinu lineari extrorsum valde aperto, 

 angulis basalibus plus minus acutis; etiam paullo minus quam species referta; mem- 

 brana glabra. 



F. major. Long. 58, lat. 28, lat. isth. 8 /u. 



Haec forma in »Sutton Park, prope Birmingham, Anglise», a Henhico Webb lecta 

 est, 1852. 



F. minor. Long. 26—30, lat, 13—16, lat, isth. 4 ,«. T. XXII, f. 4. 



Northern India. 



To the memory of Henry Werr (a good and unassuming man, among niicro- 

 mounters' of bis time facile princeps) I dedicate this species. I have Desmids and 

 Algae mounted by him, in camphor-water, still sound and perfect, although the slides 

 were prepared 40 years ago! 



54. E. inermius, (Nordst.) Nor. (E. spinulosum Delp. **inermius Nordst. Alg. Char. p. 9, 

 t, I, f. 17). 



Long. 51, lat, 47, lat. isth. 15 //. T. X, f. 51. 

 Also Wallich Mscr. No. 86. 



Not uncommon in Bengal, G. C. W.; also ex Utrtcularia Jlexuosa from the same 

 province, G. v. L., 1889. 



55. E. carduetum, n. sp. E. medioere, paullo longius quam latum, sub-orbiculatuin, quinque- 

 lobatum; semicellulae sub-hemisplnericaa; lobis lateralibus binis; lobo polari exserto, 

 apice incurvato; angulis omnibus rotundatis spinulosis; lobis basalibus et polari seriebus 

 duabus, lobis intermediis serie una, aculeorum armatis; semicellula: juxta isthmum 

 supra et infra verrucis elongatis tribus ornatre. 



Long. 58, lat. 52, lat. isth. 14 ju. T. X, f. 60. 



This seems to be near to E. spinulosum. Delp. (Desm. sub-alp. p. 85, t, VI, 

 f. 17, 18), but it difters therefrom in the arrangement and number of the aculei, in 

 the central verrucse and in the ventral inflation and ornamentation being absent. 



56. E. orbiculare, Wallich (Beng. Desm. p. 282, t. XIV, f. 8—11). 



Long. 64—72, lat, 48—66, lat, isth. 20—33, crass. 24—27 ,</. 



Wallich 1. c. Long. 71.5, lat. 64, lat, isth. 19, crass. 28 f*. 



Also in G. C. W. Mscr. No. 196. 



Few of the circular Euastra have the polar lobe so deeply incised as this spe- 

 cies, in fact many are either incavate only or faintly retuse at the apices. 



T. XI, fig. 6 a, segment with young semicell attached. bed, lateral, verticid, 

 and* basal views. 



Bengal, G. C. W.; Malabar, ex Utricularia stellari, and from Khasia, ex Utr. 

 sp., G. von L. 



57. E. inimmularium, Delp. (Desm. sub-alp. p. 87, t. VI, f. 8) var. planum, n. v. Minus 

 quam f. typica, sed habitu fere consimile; ventre planum, inornatum. 



Long. et lat, 32, lat, isth. 11 ,«. T. XI, f. 15. 

 Central India, J. S. 



