14 



MEMOIRS OF THE XEW YORK BOTANICAL GAKDEX 



plane and then rotate within the colony before the next division 

 ^A'onld ally it with 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 p diam. ; cells cylindrical, 1.2-1.5 n 

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

 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 apf)arently a 

 near relative of G. coiifluens, a species, as a rulp. with only two 

 cells ill a colony. 



Gloeothece opalothecata sp. nov. 



Plate 3, figltie 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 tegmuent; 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 Apliaiiotliece opalescens of this 

 paper. 



Gloeothece prototypa sp. nov. 



Plate 3, figuke 32 



Families floating free, congregated into small masses, or 

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



