84 \V. B. TURNER, FRESH-WATEE AU. .K OF BAST INDIA. 



42. K. rostratum, Ralfs (Br. Desm. p. 88, t. XIV, f. 6). 



Fide Wallich, Beng. Desm. p. 288. 



I have not seen any form of tliis species, but the typical form is unmistakeable, 

 and Wallich no doubt observed it. 



43. E. subspinosum, n. sp. E. minus, habitu fere E. spinoso (No. 44) consimile, sed api- 

 cibus protentius (plus minus latis) et spiuula unica, plus minus recurvata, sola muni- 

 tum; membrana glabra, plana vel tumida (inornata?). Ila' dme formae inveni: 



a. typica. Long. 36, lat. 19, lat. isth. 6.5 ,«. T. X, f. 17. 



1). tnmida. 32, 19, » » 6 u. Quaque semicellula spinulas versus duo- 



bus tumoribus lateralibus praedita. T. X, f. 37. 



Nearest to the form described by Ralfs ;is E. spinosum in Annals, p. 192, t. VII, 

 f. 6 c superior, 1844, but with rotund, not sinuate, sides. 



44. E. spinosum, Ralfs (E. elegans y spinosum Ralfs, Br. Desm. p. 89, t. XIV, f. 7 f, i, k; 

 E. spinosum Ralfs, ut supra, sub 39, f. 6 a, et c inferior). 



a. lateribus 2-spinatis. Wallich Mscr. 192 et 208. 



b. » 3- » » 

 Long. 25—34, lat, 17—21, lat. isth. 7—8.5 fi. 



45. E. elegans, Bkéb. {Cos. elegans Bréb. in Mengh. Synops. p. 222; non E. spinosum 

 Ralfs, Annals, p. 193, t. VII, f. 6; E. elegans Ktz. Phyc. Germ. p. 135; Ralfs Br. 

 Desm. p. 89 ex p. (excl. var. [i et /) t. XIV, f. 7 a, b, c). 



Var. mulum, n. v. F. semieellulis in centrali parte inornatis. 



Long. 46, lat. 32, lat, isth. 12 fi. T. XI, f. 14. 



Var. planum, n. v. Var. semieellulis a fronte nudis, tumoribus nullis pneditis. 



Long. 53, lat. 37, lat, isth. 10 u. T. XI, f. 16. 



In outline these two varieties resemble Ralfs' fig. 7 a, loc. cit. 



Hab. The former is from Bengal, the 1 ätter Northern India. 



These varieties approach E. elegans [i Cebennense Gay Monogr. p. 53, t. I, f. 6, 

 but besides being larger they differ in the lateral lobules from that variety. 

 4(>. E. divaricatum, Lund. (Desm. Suec. \). 21, t. II, f. 5). Typical form: Long. 44, lat. 

 37, lat, isth. 10 u. T. XI, f. 22. 



Var. inevolutum, n. v. F. lobulis basalibus non spiniferis; semicellulaB centro et 

 margine granulis et tumoribus inornatse, sed apicem versus tumoribus duobus parvis 

 prasdita?. 



Long. 42, lat, 29, lat, isth. 8 ,«. T. XI, f. 25. 



The above, 42, 43, 44 and 46, I believe are among the forms attributed by Dr. 

 Wallich to E. rostratum (Desm. Beng. p. 283). 

 47. E. longifrons, n. sp. E. submediocre, circ. duplo longius quam latum, clongatuni; 

 semicellulse longe quadratica\ basi rotundataj, supra attenuatse; lateribus 3-undulatis 

 bi- vel tri-spiniferis; apicibus incisis, externe rotundatis angulis recurvatis aculeatis; 

 membrana (in quaque semicellula) 7 tumoribus (4 margine, 2 apice et 1 centro) parvis, 

 quoque annulum granulorura ferente, ornata; sinn profundo, lineari, vix externe aperto. 

 A latere \ isum sub-acute constrictum; semicellula' eompresso-ellipticai, apicem versus 

 contractae, apice rotundatas utroque latere emarginatae. 



