4 Transactions of the Society . 



Aphanocapsa rivularis Kabh. 

 Forming large green shining jelly-like masses on grasses 

 hanging over into a spring on Park Fell, Lancashire, inclosing 

 numerous rhizopods, diatoms, &c. 



Microcystis marginata Kirch. 



This interesting organism was observed several times in gather- 

 ings from moor pools. The pale blue-green cells were seen to be 

 in constant motion within the hyaline investing membrane, 



Merismopedia glauca Nag. Wetherlam, Lancashire. 

 Mekismopedia ? PALUDOSA n. sp. Plate I. fig. 1 . 



Each family composed of eight cells, closely packed together 

 without intermediate spaces, and with no evident gelatinous en- 

 velope. Cells square in outline with rounded corners, remarkably 

 regular in form, and each divided into four; cell-contents blue- 

 green. Length of colony, 50 fx ; breadth, 25 /i ; cells 12 • 5 yu- in 

 length and breadth.* 



The small number of cells in a colony, and the absence of 

 spaces between the cells, seem sufficient to characterize the species. 

 It was gathered in bog pools, Loughrigg. 



OSOILLAEIACE.S!. 



Oscillaria violacea Eabh. 



„ tenuis Ag. 

 Lyngbya ochracea Thar. 



„ inundata Cooke {Phormidium inmidatum Ktz.). 

 Ambleside. 



SlROSIPHONE^. 



Stigonema saxicolum ? Nag. On damp rocks, along with 

 Nostoc humifusum. 



NOSTOCACE^. 



Anabaena Hassallii Nords. & Wittr. 

 Cylindrospermum macrospermum Ktz. 



„ catenatum Ealfs. Fumess Fells, Lanca- 



shire. 

 Nostoc humifusum Carm. On moist rocks. 

 NoSTOC HYALINUM n. sp. Figs. 2, 3. 



Free-swimming, very minute. Gelatinous envelope globose or 

 slightly ellipsoidal, 0'2I mm. in diameter, lamellose, perfectly 

 colourless and transparent. Trichome single in each envelope^ 



* These measuremeDts correspond nearly with those given by Nageli 

 (' Gattungen einzelliger Algen ') for M. glauca, but I cannot reconcile Dr. Cooke's 

 relative measurements of the different species of Merismopedia with his plates. 



