COSMARITJM. 193 



'in densely granulate, granules near the maro-iu 



tJ O 7 O 



often in pairs, granules towards the centre of the 

 semicells reduced, with two adjacent granulate pro- 

 tuberances in the centre. Side view of semicell broadly 

 ovate-elliptic, slightly tumid at the base on each side. 

 Vertical view elliptic, with a pair of adjacent granulate 

 tumours at the middle on either side, poles densely 

 granulate with the granules arranged in interrupted 

 transverse and longitudinal series. Chloroplasts axile, 

 with two pyrenoids. 



Zygospore unknown. 



Length (38 ^ ; breadth 59 \L ; breadth of isthmus 

 18 [L ; thickness 38 /z. 



IRELAND.- -Xear West-port, Mayo ! 



This species occurred sparingly amongst C. Turpinii var. 

 ex uiiut.ru in a small pool near Westport. The form of the 

 semicells and the general granulation distinguish it at once 

 from C. Turpinii. the only other allied species with binate 

 central protuberances. 



180. Cosmarium entochondrum sj>. IWI '- 



(PI. LXXXYII, fig. 17.) 

 Cells somewhat small, a little longer than broad, 



7 O 



very deeply constricted, sinus narrowly linear with a 

 slightly dilated extremity ; semicells widely truncate- 



O t> i/ / 



pyramidate (or truncate-subsemicircular), basal angles 

 subrect angular but obtuse, furnished with a prominent 

 conical granule, sides convex and biundulate, apical 

 angles rounded and furnished with a single large 

 granule, apex broadly truncate, very slightly convex, 

 and smooth, immediately within the apex and apical 

 angles with an arc-like series of 6 granules, the largest 

 in the centre and smaller ones at the ends, with one 

 large granule immediately above the isthmus, and with 

 several (3-5) minute granules in the centre. Side 

 view of semicell circular, with a large granule on each 

 side' near the isthmus and one on each side of the apex. 

 Vertical view elliptic, ratio of axes about 1 : 1'7, poles 

 VOL. in. 13 



