140 



OOCVSTIS AND EREMOSPH^RA, 



note of interrogation in the name is Turner's, and, indeed, from 

 the description ("pale brown mucous contents," &c.), it is ex- 

 tremely unlikely that the specimen figured was an Oocystis, or 

 any other species of freshwater algie. The name may well be set 

 aside. 



cu 



Text-fig.'26.— (a) t>.(?) hnmnea Turner, ( x (iOO) ; after Turner. (/') C».(?) 

 wia?)«H?7/ato Turn., ( X 1500); after Turner, (c) Hyalotheca hians, a 

 form, ( X 550), original. 



OocYSTis(?) MAMMiLLATA Turn. (Text-fig.266). 



"O. sub-circularis, paullo longior quam lata, apicibus paullo 

 depressis, apice in centro rutundata vel distincte mamniillata; 

 divisio verticalis; a vertice visa perfecte circularis. Long. 18, 

 lat. 15-2 fi" Turner, I.e. 



Cf. Turner, Frw. Alg. E. Ind., 1892, p.l55, T. xxi., f.U. The 

 (juery again is Turner's. This form might have been accepted 

 without question as a genuine Oocystis but for the vertical line 

 from pole to pole. Such a thing, I have never noted in any 

 specimen of Oocystis whatever.* In empty cells of Ere7nosph(fra, 

 it is true, faint lines, 2-4 or so in number, may often be seen 

 radiating out from the poles, but even these do not stretch dis- 

 tinctly fi'om pole to pole. I figure here a form of Hyalotheca 

 hians Nord., with prosilient suture, which, both in size and 

 appearance, comes very close to Turner's specimen. The dimen- 

 sions of the cells are 21x31/i, suture 37 /x. Solitary cells of 

 Hyal. hians are not at all uncommon in my gatherings. 



* On this point, however, the figures of (''.)Glaucocyi<tis cingulafa Bohlin, 

 Alg. Regnellschen Exp., T. i., f. 11-13, are worthy of consideration. 



