118 W. Ii. TUKNEK, FKESH-WATER ALCE OF EAST JXDIA. 



Formge parvse a cl. G. C. Wallich observata\ sec. Mscr. Nio. 21(5; Proc. et rad. 

 sinuatis et glabris aut serratis. 



Long. 42, lat. 43 (c. proc.); long. et, lat. (s. proc.) dre. 23, lat. isth. 6— 7, long. 

 proc. 7 — 9, crass. proc. 2 — 3 f*, tide G. G. \V. 1. c. 



The first 3 mentioned above I have found to be exceedinglv eommon m thc 

 Bengal materiel. All the apices appear to be simple rotundate, I have not seen one 

 approaching the produeto-truneate form of apex mentioned by Nordstedt (Alg. N. Z. 

 ]>. 35, t. IV, f. 1); but it is evident that this is a very polymorphic species. Maskells 

 f. 13 b is hexagonal, a is pentagonal; his f. 10 (of 1880) is heptagonal. Two of Wal- 

 liciis icons show that the lower or basal radii are of ten much convergent, and cross 

 those of the other semicell, in this case the sides of the semicells appear laterally in- 

 clined. Joshua, in Burm. Desm. p. 642, enters this species twice, under Bulxheims 

 and liEixscifs names! 



T. XIV, f. 1; a f. triangularis; b f. £ compressa. 



61. S. horridum, n. sp. S. minns, valde latins quam longum; semicellula' fusiformes, 

 apice truncato-emarginatae, basi paullo infläta'; triangulatae; inträ angulos [)rocessnbus 

 binis apiculatis vel emarginatis ornatse; änguli in radios breves produeti; radiis valde 

 aculeatis, apicibus 3 — 4-fidis; semicellularum basis aculeata; juxta isthmum glabra; 

 sinn profundo, aeiito. A vertice visum triangulare, lateribus sub-reetis; medio verru- 

 culis triangnlatim positis ornatum. 



Long. 22, lat, 29, lat. isth. 8 /u (after Wallich Mscr No. 233). T. XIV, f. 4. 

 Nearest to Stau. aculeatum (Ehr.) Mexgh., from which it differs in the non- 

 aculeate apices and in the brevity of thc ]»rocesses. 



62. S. pisciforme, n. sj>. S. mediocre, circ. quinta pars latins quam longum; scmicellula' 

 longe fusiformes (»pisciformes»), basali parte j)aullo infläta', dorso leniter convexa': 

 dorsum processubus brevibus furcatis G instruetum; semicellulae basi prominentiis sessi- 

 libus brevibus emarginatis 6 ornatae; angulis 3, recte produetis, la;'vibus, apicibus fur- 

 catis; membrana glabra; sinu profundo, ainpliato, interne rotundato. A vertice visum 

 triangulare, lateribus medio paullo convexis, angulis acutis. 



Long. 46—50, lat. ö6— 62 (c. rad.), lat, isth. 10—14 fi. T. XIV, f. 7, also in 

 Wallich Mscr. No. 236, 237. 



63. S. Iudicum, n. sp. S. sub-mediocre, 1A — l|-plo latins quam longum; semicellula' late 

 cuneatae, dorso paullo rotundatae, basi inflato-sinuatae; dorsum processubus brevibus 

 crectis furcatis 6 instruetum; semicellula' trigoinc, angulis processubus non longis ser- 

 ratis apice dupliciter bitidis (vel 2 et 2 aculeis verticaliter et binatim) munitis; mem- 

 brana reliqua glabra; sinu brevi, sul)-acuto. A vertice visum triangulare, lateribus 

 leniter incurvatis. Massa chlorophyllacea 3-radiata. 



T. XIV, f. 11, after Wallich Mscr. No. 232. 

 Long. 20, lat, 29 (c. proc), lat, isth. 6.5 ,u. 

 » 24, » 42 » » » 9,5 ,u. 



Raneegunge. 20 Nov. 1885, G. C. W. 

 Thc doubly bifid aj)ices of the processes, shewn at f. 1 1 b, are verv peculiar. 



