CHROOCOCCACExE. 217 



lobes, rounded at the ends, and each terminated by a very 

 delicate straight bristle, in length about equal to the diameter 

 of the cell ; in side view oblong, somewhat inflated at the 

 middle at each side, ends round, and each seen tipped by the 

 bristle. 



SIZE. Cells without bristles -0062--0075 mm., including the 

 bristles '016--02 mm., from end to end. 



In moor pools, Co. Dublin and Wicklow. 



Plate LXXXVIL fig- 10. Cells magnified about 600 diam. After 

 Archer. 



GENUS 90. SYNECHOCOCCUS. Nag. (1849.) 







Cells oblong, usually single, sometimes 2-4 connected in a 

 series constituting a family. Cell membrane thin, cell-contents 

 blue green ; now and then yellow or pale orange. Tegument 

 absent. Division in one direction only. 



Synechococcus crassus. Archer Micr. Journ. 1867, p. 87. 



Cells broadly elliptic, about one half longer than broad ; cell 

 wall very thin. 



In shallow pools. Bray's Head, Ireland. 



Larger than the largest of Nageli's species (S. ceruginosus*), from which 

 it is also distinguished by its elliptic or egg-shaped cells, somewhat 

 narrowing towards the gradually rounded ends, and not cylindrical, with 

 rounded truncate ends. 



No figures or measurements of this species have been published, and 

 only the bare description reproduced above. 



GENUS 91. GL<EOTHECE. Nay. (1849.) 



Cells cylindrical-oblong, rounded at the ends ; division trans- 

 versal in one direction. Other characters as in Glceocapsa. 

 Tegument very thick, lamellose. 



Gloeothece cystifeira. (Hass.) Ralli. Alg. Eur. II., 61. 



Cells oblong-cylindrical, 2-4 associated in families ; involved 

 in a special universal tegument which is globose or oval, 1^-3 

 times as long as bread. Coil-contents verdigris green. 



