CHROOOOCCACE.E. 219 



We are of opinion that this and the next species, as well as the 

 Pcdmdla Mooreana figured on the 5th plate of this worU, are all one 

 species. 



Plate L XXXV 111. fig. 3. a, natural size; b, cells magnified 400 

 diam. 



Aphanothece stagnina. (Spr.) Ralli. Alg. Eur. n., 66. 



Thallus gelatinous, oblong or elliptical, or nearly globose, 

 from the size of a pea to that of a cherry, pale hyaline verdi- 

 gris green ; cells oblong-oval, always smaller than in A.prasina, 

 -1 times longer than broad, tegument none, cell-contents pallid 

 verdigris green. 



SIZE. Cells -003--005 x '005--008 mm. 



Kirch. Alg. Schles. 252. 



Coccochloris stagnina. Spreng. Linn. Syst. iv., p. 372. 



In stagnant water. 



It is very doubtful whether any definite specific character can be found 

 to separate this from A. prasina. -As we have taken both from the 

 same pond, the difference in colour, and in the size of the cells, may be 

 assumed to be attributable only to difference in age. 



Plate LXXXV1I2. fig. 4. #, natural size ; I, cells magnified 400 

 diam. 



GENUS 93. HOMALOCOCCUS. Kutz. (1863.) 



Thallus globose, gelatinous ; internal cells irregularly united 

 in a plane, oblong body, immersed in the gelatinous thallus. 



Homalococcus Hassallii. Kiitz. Osterprocj. 1863, p. 6. 



Thallus globose, soft, green, of the size of a pea or a hazel- 

 nut ; cells rounded or somewhat angular. 

 SIZE. Cells about '006 -'007 mm. diam. 

 Rabh. Alg. Eur. ii., 69. 

 Coccochloris hyalina, Hass. Alg. 315, t. 78, f. 2, a, b, 



In stagnant water. 



Plate LXXXV1II. fig. 5. a, natural size; b, cells magnified 400 

 diam. After Hassall. 



