ILEMATOCOCCUS. 331 



to the outer membrane. The cells, the youngest of all, con- 

 tain but a single granule : as the developement proceeds, this 

 becomes divided into two other granules, and these are again 

 subdivided, and so on the process of multiplication proceeds, 

 in some cases, as in H. sanguineus and H. frustulosus, to a 

 much greater extent than in other species. 



12. ILEMATOCOCCUS BINALIS Hass. 



Plate LXXXII. Fig. 2. 



Char. Cells large, elliptical, green, each containing mostly two 



semi- elliptical granules. 

 Pleurococcus thermalis $ Menegh., loc. cit. t. iv. fig. 3. 



Hob. Cheshunt : A. H. H. Aberdeen, mixed up with 

 other Algae : Dr. Dickie. 



This species is very distinct. Some of the cells contain 

 but a single granule, others two, and these are by far the 

 most numerous ; others again, four granules. The species I 

 suspect is by no means uncommon. 



It is not unlikely that this is an appendaged species. 



13. HLaEMATOCOCCUS FURFURACEUS Hass. 

 Plate LXXXII. Fig. 4. 



Char. Cells small, spherical, or somewhat angulated. Granules 

 often associated in pairs, 



Palmella furfuracea Berk., Glean. Alg. p. 18. t. 5. f. 3. .P. 

 furfuracea Harv., in Manual, p. 178. 



Hab. Forming a thin mealy stratum of a light yellowish 

 green, on the walls of a large frame at Milton, North- 

 amptonshire : Rev. M. J. Berkeley. Limestone rocks, 

 co. Antrim : Mr. Moore. 



" Fronds aggregate, diffuse, irregular, granulated, rather 

 rigid, under the knife, falling down into a mass of minute 



