14 collins axd hehvet. 



Class MYXOPHYCEAE. 

 Family CHROOCOCCACEAE. 



Cheoococcus Nageli. 



1. Cells 3-8 ;i diam., 1- C. membraninus. 



1. Cells 13-25 M diam. 2. C. turgidus. 



*1. C MEMBRANINUS (Mencgh.) Nageli, 1849, p. 46; P. B.-A., 

 No. 2151; Pleurococcus membraninus Meneghini, 1842, p. 34, PL IV, 

 fig. 1. In brackish pool near race course, Aug.; in ditch in South 

 Shore marshes, Sept., CoUins. In the material from the locality first 

 named the cells were dividing rapidly, and average smaller than in 

 P. B.-A., No. 1201, about Uke Wittrock, Nordstedt & Lagerheim, 

 Xo. 1538. Sometimes the division of the cells goes on so much 

 faster than the separation of families that a mass resembling a 

 Microcystis is formed. 



2. C. TunGiDtrs (Kiitz.) Nageli, 1849, p. 46; Protoeoccus turgidus 

 Kiitzing, 1845^9, p. 5, PL VI, fig. 1. In gelatinous masses in brackish 

 pools, and in films on decaying algae near Flatts Bridge, April, CoUins. 



Stnechoctstis Sauvageau. 



* S. AQiTATiLis Sauvageau, 1892a, p. CXVI. On rocks near Himgry 

 Bay, April; in cave, Agar's Island, Aug., Collins. 



Stnechococcus Nageli. 



* S. AEHUGixosus Niigeli, 1849, p. 56, PL I. E, fig. 1. Among other 

 algae in brackish pool near race-course, Aug., ColUns. Cells about 

 14 X 7 ;u, which is rather small for this species. 



Chkoothece Hansgirg. 



1. Cells seldom under 20 ^ diam. 1. C. Richteriana. 



1. Cells not over 3 M diam. 2. C. cryptarum. 



1. C. Richteriana forma jiarina Hansgirg, 1889, p. 5; P. B.-A., 

 No. 702. Farlow; rather common on shaded stone work and on sides 

 of caves, Collins. 



