Fresh-water ALgse, &c. By A. W. Bennett. 3 



its very distinctly spiny envelope. It is endowed with a slow motion, 

 not in any way connected with the spines. It was observed only very 

 sparsely in a sphagnum bog in Borrowdale. 



Urococcus insignis Hass. (?) Fig. 5. 



Pseudocyst large, solitary, nearly globular, of a brick-red colour, 

 from 28 to 35 yj in diameter, inclosed in a colourless gelatinous sheath 

 composed of a number of rings, which form a short stem. The species 

 described under this name has been observed only by Hassall, and as 

 he gives no measurements, it is impossible to identify with certainty 

 my plant with his, but it appears to agree. It is larger than 

 U. Hookerianus Hass., the only species of which Dr. Cooke gives 

 measurements, and differs in other respects from the remaining species 

 recorded as British. Bog pools, Borrowdale ; very scarce. 



Capsulococcus n. gen. Protococcacearum. 



Cellulae virides, globosae, solitariae vel 2-8 in familias associate, 

 tegumento lamelloso, firmo vel subgelatinoso, subgloboso vel ovoideo, 

 crateriformi, fusco, denique subsolido. 



Capsulococcus crateriformjs n. sp. Figs. 6-8. 



Pseudocyst large, bright green, usually solitary (fig. 6), and then 

 from 20-25 /u, in diameter, or even more, globular or elliptical ; or 

 divided into a nest of 2-8 smaller pseudocysts (fig. 7). Tegument a 

 lighter or darker brown, lamellose, nearly globular or ovoid in general 

 outline (fig. 8), varying in diameter from 25 to 75 or 80 /x, but with 

 a deep round saucer-shaped depression (at one end when the tegument 

 is ovoid), with very sharply defined rim. At the bottom of this 

 depression is seated the single pseudocyst or nest of pseudocysts. 

 The teguments appear to assume a darker and somewhat indurated 

 character after shedding the pseudocysts (fig. 8). Bog pools, Borrow- 

 dale ; not uncommon. 



Charactace^. 

 Dictyosphaerium reniforme Buln. Bog pools. 



CHROOCOCCACEvE. 



Chroococcus pyriformis n. sp. Fig. 9. 



Pseudocysts very large, somewhat pear-shaped, 50 /m long by 37 ■ 5 /j, 

 broad, associated in pairs, and each pair inclosed in a very thin muci- 

 lage ; the two pseudocysts but slightly attached by their somewhat 

 broader base. Endochrome very bright blue-green, somewhat granular. 

 Pool near Derwentwater. 



Coelosphaerium Kiitzingianum Nag. Frequent. 



GOMPHOSPH^RIA (?) ANOMALA n. Sp. Fig. 10. 



Tegument quite globular, well-defined, from 110 to 120 fi in 

 diameter, composed of perfectly colourless and transparent mucilage. 



b 2 



