52 W. B. TURNER, FRESH-WATER ALG.E OF KAST INDIA. 



Wallich, Mscr. No. 151; zyg. No. 149 (diam. zyg. 38, c. sp. 55 /U, fide G. C. W) ? 

 T. IX, f. 40. It scems possible that this is identical with ( '. phaseolus ft stigmosum 

 Nordst. (Alg. N. X. p. 59, t. 3, f. 14), which, with deference to Dr. X., I do not think 

 is a var. of the said species — indeed, lic himself appears to think that it is probably 

 a separate species — it might stånd as Cos. stigmosum, Nordst. 



25. C. subcirculare, n. sp. C. mediocre; circ. tam longum quam latum; late ovatum; semi- 

 celluke sub-semicirculares, basi rotundatae, dorso sub-rotundatae ; isthmo modice con- 

 stricto, sinn sub-lineari, extrorsum ampliato; membrana pallide fusca, subtiliter \cl 

 dense punctata, etiam rugosa (fere ut in C. cyclico, Lundell). A vertice visum ovale, 

 apicibus sub-acutis; a latere ovato-truncatum, modice constrictura (semicellulis fere 

 doliiformibus). Prope praecedentes, et C. Lundellio, Delp. (1. c. p. 109, t. VII, f. 62 — 64). 

 Wallich, Mscr. No. 148. 



«. Long. 58, lat. 56, lat. isth. 24, crass. 24 ,u. T. VIII, f. 3] jx f .,_ „_ 



it rugosum. Long. 55, lat. 55, lat. isth. 24, crass. 36 ,«. T. Mil, f. 7 1 

 Bengal; Central India. 



26. Cos. sp. C. mediocre, paullo longius quam latum, late ovale; semicellulae depresso- 

 pyramidales, e basi magis angustatae, dorso convexa 1 ; sinu lineari extrorsum ampli- 

 ato; membrana lsevi?; angulis basalibus plus minus rotundatis. In sciagraphia ha- 

 bitu C. Ralfsii c. montanum Racib. (Des. Polon. p. 15, t. I, f. 4) sed duplo minus 

 atque heve. 



Long. 48, lat. 40, lat. isth. 18 fi. T. VIII, f. 4. 



In all probability this is a form of C. galeritum Nordst. (Desm. Brås. p. 209, 

 t. III, f. 26). 



27. C. microsphinctum? Nordst. (in Xohd. et Wittr. Desm. et (Edog. p. 33, t. XII, f. 9) 

 forma parvula. Forma sinu profundiori et raargine non ita regulari quam in f. typica. 



Long. 26, lat. 15, lat. isth. 5 ,". 



The membrane is smooth, and yellow-brown in colour. This may be intermediatc 

 between X t ordstedt's sp. and the smaller forms of ('. ps.-granatum Xokost. (Desm* 

 Brås. t, III, f. 27). 



Bengal; Central India. 



28. C. qu ådrans, n. sp. C. submediocre, tam longum quam latum, quadraticum, semicellulae 

 depressa' quadrataa; angulis basalibus paullo, et superioribus magis, rotundata'; sinu 

 lineari, alto, externe ampliato; membrana paullulum incrassata, minute granulata. A 

 vertice ovale. 



Long. 28, lat. 28, lat. isth. 9, crass. 14 u. T. VIII, f. 6. 



29. C. octogibbosum (Reinsch) X t ob. (Reinsch Contr. Alg. From. Bonae Spei, p. 240, 1877; 

 Didym. (Cos.) Hammeri, Reinsch, Alg. Frank. p. 111, t. X, f. 1, f. g. i. k.; Spec. Alg. 

 p. 115, t. XXII, B, I, f. 13 — 19) ^ Indica, n. var. Ut in specie Reinschii, sed apicibus 

 paullo productis, incavatis. 



Long. 24, lat. 17, lat. isth. 5.5 /'. T. VIII, f. 8. 



Under C. Hammeri (a. majus; b. minus; et c. octogibbosum), Reinsch has de- 

 scribed 2 distinct forms; this resembles the latter, but is more elongate and a little 

 Jarger still it seems a cognate form. Cfr Reinsch in Linn. Soc. Journ. 1877, 1. c. 



