90 W. B. TURNER, FRESH-WATER ALii.K OF KAST INDIA. 



Lon-. 92—106, lat. 90—102 ,u. 



Northern India; Himalayas. 



The Indian specimens approach the semiradiate form. 

 B. M. expansa, Bailey (Micr. obs. p. 37, t. I, i'. 7; M. arcuata Bail. (i exppnsa Nordst. 

 Nonn. Alg. Brås. p. 23, fig. II xylogr.). 



Forma No. 5 Nordst. 1. c. accedens. 



Long. 75, lat. 69, lat. isth. 11 (i. 



Central India; Bengal? G. C. W. 



Most observers will agree with Nordstedts view. in uniting the M. expansa and 

 arcuata of Bailey under one specific name; Wallich also, p. 276 Beng. Desm. takes 

 M. arcuata as a var. of M. expansa. I did not see the form or variety arcuata. 



7. M. tropica, Nordst. (Desm. Brås. p. 219, t. II, f. 15; M. expansa, var. y Wallich, 

 Beng. Desm. p. 277, t. XIII, f. 9; Mscr. No. 72). 



Long. 92—102, lat, 85—90, lat. isth. 16, lat. apic. 40—52, lat. lob. pol. 16, 

 crass. 28 f. T. V, f. 1. 



Wallich, 1. c. gives dimensions, long. 128, lat, 115 /u, but I saw none so large 

 as this; the Brazilian specimens of Nordstedt are long. 125, lat. 101 ,«. 



Raneegunge. 



The margin of the central portion of the polar lobe is sometimes minutely den- 

 tate, sometimes with short strong teeth; the direction of the forks of that lobe exhibit 

 varying degrees of divergence. The Indian form might stånd as M. tropica fi minor. 



This form is certainly not closely related to the preceding species which is of 

 different form, smooth and not with serrated margins; on this I eannot coincide with 

 the views of Dr. Wallich, 1. c. 



8. M. stauromorpha, n. sp. M. parvula, paullo longior quam lata, stelliformis; semicellula? 

 trilobatae, lobis lateralibus divergentibus, apice rotundatis, utercjue lobus spinulam vel 

 mucronem ferens; lobi polares longe porrecti, apice truncati, utroque angulo mucrone 

 muniti; membrana leevis. Sinus incurvatus, magnus, extrorsum valde ampliatus. A 

 latere visa modice constricta, acuto-lanceolata; a vertice visa fusiformis. 



Long. 52—61, lat, 40—48, lat, isth. 9—10, lat, apic. 11, lat, lob. pol. 9—10, 

 (Tass. 12—13 ,//. T. VI, f. 16—18. 



This peculiar little species is almost Euastriform in front view, it is apparently 

 nearest to M. arcuata (i expansa Nordst. (Nonn. Alg. Brås. p. 23, f. II, 6). 



9. M. rotata. (Grev.) Ralfs (Annals N. H. vol. XIV, p. 259, t. VI, f. 1 a sinistra, et c; 

 Echinella rotata, Greville in Hook. Br. Flor. v. II. p. 398, 1830; Euastrum rota, 

 Ehr. Infus. t, XII, f. 1 c, e; Focke, Phys. Stud. t, I, f. 15; Mic. denticulata, Bréb. 

 Alg. Fal. p. 54 ex p., t, 8; Cosmarium stellinum, Corda, Alm. Carlsb. p. 121, t, II, 

 f. 22; Eutomia rotata Harvey Man. Br. Alg. p. 187, ex p.; etc.). 



W t allich, Beng. Desm. p. 280. 



Bengal, »somewhat sparingly», G. C. W. (vide Appendix). 



10. M. denticulata, Bbéb. {M. denticulata ex p. Bréb. Alg. Fal. p. 54, et M. heliaeti.s Bréb. 

 1. c; Euastrum rota Lin;. Inf. t. XII, f. 1 a; Focke, 1. c. t. II, f. 1 — 7; ,1/. rotata 

 Ralfs Annals I. c t. VI, f. 1 a dextra; Eutomia rotata, Harvey 1. c. ex p.; etc). 



