14 



:memoirs of the xew york botaxic.u. gardex 



jilane and then rotate ^vithin the colony before the next division 

 would ally it Avith the genus Gloeothece. 



Gloeothece parvula sp. nov. 



Plate 3, figure 30 



Families containing up to 32 cells, but usually 8-16, free or 

 collected into small masses among other algae, not forming a 

 definite stratum alone, 12-18 n diam. ; cells cylindrical, 1.2-1.5 p 

 diam., 2-3 times as long as the diam., pale aeruginous ; tegument 

 hyaline, homogeneous, ample, 3-4 times as thick as the diameter 

 of the lumen of the cell. 



Growing in association with numerous other species of Myxo- 

 phyceae, near Hato Arriba, Arecibo, no. 1410 h, type. 



The above-described species of Gloeothece is apparently a 

 near relative of G. confluens, a species, as a rule, with only two 

 cells in a colony. 



Gloeothece opalothecata sp. nov. 



Plate 3, figuke 31 



Colonies moderately firm and rigid, spherical, containing 2-4 

 cells, agglutinated into masses of indefinite extent ; cells slightly 

 elongated, 2-2.5 u diam., 1.25-2 times as long as broad without 

 the tegmnent ; tegument opalescent, homogeneous, firm, about 3 

 times as thick as the lumen of the cell. 



Growing on limestone, near Hato Arriba, Arecibo, no 1434, 

 type. 



This species is on the border line between Gloeothece and 

 Gloeocapsa. The cells in a state of division are mostly spherical, 

 but when in the resting stage they average about one-half longer 

 than broad. 



The colonies remain spherical even in large masses, the mu- 

 tual pressure not being sufficient to distort them, the teguments 

 being firm. They are sufficiently sticky on the surface, how- 

 ever, to cause them to adhere very firmly to each other. The 

 species has a near relative in Aphanothece opalescens of this 

 paper. 



Gloeothece prototypa sp. nov. 



Plate 3, figure 32 



Families floating free, congregated into small masses, or 

 forming a continuous stratum, composed of 2-4 cells, very abun- 



