Cushman: Desmids from New England 611 



30. Euastrum fissum americanum Cushman. 



Length 38//; breadth 2ifi\ isthmus 6fi; polar lobe 16 fi. 

 Occasional, St. Anthony. 



31. Euastrum Allenii Cushman. 



Length 105 ft ; breadth 49 jx ; isthmus 18 ft ; polar lobe 33 ft. 

 Occasional, Rose au Rue. 



MICRASTERIAS Ag. 1827 



32. Micrasterias pinnatifida (Kutz.) Ralfs. 



Length 66//; breadth 75//; apical lobe 56//. Occasional, 

 Bay of Islands. 



33. Micrasterias truncata (Corda) Breb. 



Length 78 ft ; breadth 78 ft ; isthmus 16 ft ; apical lobe 56 ;x. 

 Common, St. Anthony. 



34. Micrasterias conferta Novae-terrae Cushman. 



Length 102 ft ; breadth 93 ft ; isthmus 12 ft ; apical lobe 37 /x. 



Frequent, Rose au Rue. 



35. Micrasterias denticulata Breb. 



Length 205 ft; breadth 170 fi; isthmus 30 ft: apical lobe 

 102 /a Occasional, Bay of Islands. 



Micrasterias denticulata angulosa (Hantzsch.) W. & G. 



S. West. 



Length 330 // ; breadth 210//; isthmus 36 ft ; apical lobe 58 ft. 



Occasional, St. Anthony. 



COSMARIUM Corda. 1834 

 36. Cosmarium subundulatum Wille. 



Length 58 jx\ breadth 41//; isthmus 16/1. Common, St. 

 Anthony. 



17. Cosmarium Cucumis (Corda) Ralfs. 



Length 70-75 ft ; breadth 39-42 fi ; isthmus 19-21 ft. Com- 

 mon, St. Anthony. 



38. Cosmarium contractum Jacobsenii (Roy) W. & G. S. West. 



Length 43 ft ; breadth 24 ft ; isthmus 6 ft. Occasional, St. 

 Anthony. 



