62 W. B. TURNEK, FRESH-WATER ALG^E OF EAST INDIA. 



76. C. striatum, Boldt. (Sibir. Chloroph. p. 104, t. V, f. 9) f. Indica. Fere ut in f. ty- 

 pica, sed lateribus supra basin fere rectis, dorso indistincte 4 — 5 crenato; strise api- 

 cales indistinctae. 



Long. 15, lat. 12, lat. isth. 4 /u. T. IX, f. 6. 



This is near to, but smaller tban, C. striatum v. glabratum Rac. (Des. Nov. p. 9, 

 t. V, f. 31), but, as in the form from Liibeck, the striae are very faint. 



77. C. perizosmimi, n. sp. C. parvum, vix tertia parte longius quam latum, late ovale; 

 semicellulffi plus minusve ovato-depressaB, lateribus e basi plus minus rotundatae, apice 

 depresso-rotundatae; menibrana marginem versus granulata, lateribus ordinibus tribus 

 granulorum concentrice positis instrueta, (ordine interiore semi-circula riter continuata), 

 apicem versus granulis circ. 4, centralibus maximis, ornata; sinu lineari, extrorsum 

 ampliato. A vertice visum ovale. 



Long. 22, lat. 17, lat. isth. 6 ,//. T. IX, f. 12. 



fi ornatum. Fere ut supra, sed ordo interiör granulorum non continuata. apicem ver- 

 sus interrupta; semicelluhe ventro paullo tumida', granulis 6 — 7 gregariter positis ornata 1 . 



Long. 21.5, lat. 18, lat. isth. 6 //. T. IX, f. 13. 



This is somewhat like the form represented in T. VIII, f. 10, but that bas only 

 2 marginal granules larger than the rest, and only 2 series. 



78. C. concentricuni, n. sp. V. minus, circ. lV.-j-plo longius quam latins; longe ovale; valde 

 constrictum; semicellube depresso-ovales, basi dilatataa, angulis basalibus aeute-rotun- 

 datis, apice paullo rotundatae, apicem versus leviter attenuatee; sinu profundo, aperto 

 angusto-triaugulari, extrorsum valde ampliato; membrana rugosa, ordinibus 6 — 7 in 

 quaque seraicellula granulorum concentrice dispositis instrueta. 



Long. 23, lat," 18, lat. isth. 7 //. T. IX, f. 11. 



Nearest to the small forms of C. punctulatum, Bréb.; possibly the same as C. 

 orbiculatum Delp. (Desm. Sub-alp. p. 107, t, VII, f. 46) nec Ralfs! 



79. C. sp. C. minus, late ovale, paullo latins quam longum; semicellube late ovales, mar- 

 ginem versus ordine granulorum (granulis apicalibus maximis) instrueta', ventre laeves, 

 reliqua parte niinute granulata 1 ; sinu angusto-lineari, profundo, extrorsum amjtliato. 



Long. 20, lat, 18, lat, isth. 7 ,«. T. IX, f. K». 



I ara in doubt as to placing this form; it is undoubtedly near to C. /»i'/:osmum 

 No. 77; possibly it might stånd as var. / granulatum of that species. 



80. C. cuneatum? Josh. (Burm. Desm. p. 647, t. 24, f. 17, 18) var. Indicuni. Marginibus 

 e basi dentatis; centro nudo; apicibus crenato-truncatis. 



Long. 39, lat, 45, lat. isth. 11 ,«. T. IX, f. 14. 



This is rather bard to identify, as Mr. Joshua's figures are botb obliquely drawn 

 (f. 18 much so); the var. is niore depressed than the type, without the central gra- 

 nules; with semicells dentate from th» 1 basa] angles upward to the apices, which are 

 crenato-truncate. 



Centra] India. 



81. C. ptilotnm, n. sp. C. mediocre, quinta parte longius quam latius, depresso-ovale, semi- 

 cellula' depresso-ovatae, lateribus rotundatae, tota margine (ut mihi videtur) crenato- 

 undiilata' (.lorso sub-truncata\ medio paullo tumida'); menibrana achroa, marginem 



