Cushman : New England Saccodermae 345 



4. Gonatozygon aculeatum Hastings, Am. Month. Micr. Jour. 

 13: 29. 1892. 



Cells cylindrical, the apices not at all or very slightly dilated ; 

 cell-wall clothed with long stiff spines. 



Length 350/i : breadth with spines 40 // : without spines 20/*. 



N. H. : Pennichuck Pond, Nashua {Hastings). Meredith, occa- 

 sional {Johnson). Laconia, frequent ( Wests). Mass. : Plainville ! 



Tribe Spirotaenieae 



SPIROTAENIA Breb. 1848 



5. Spirotaema condensata Breb. in Ralfs, Brit. Desm. 179. //. 

 34. f. 1. 1848. — Wolle, Desm. U. S. $-$. pi. 3. f. 21 , 22. 

 1884. 



Cells cylindrical, the ends rounded, the length 7-10 times the 

 width ; a single broad, parietal, revolving chloroplast with eight 

 to ten close revolutions. 



Length 108-160//: breadth 15-20//. 



Me. : Orono {Harvey). N. H. : Pudding Pond, North Con- 

 way ! Mass. : South Framingham ! Carver's Pond, Bridgewater ! 

 Gay Head, Marthas Vineyard ! R. I. : Wainskut Pond, North 

 Providence {Bailey). Conn. : Mill River, Fairfield {Wests). 



* 6. Spirotaenia parvula Arch. Proc. Dubl. Nat. Hist. Soc. 3 2 : 

 84. //. 2. f. 32-43. 1863. 



Cells small, the ends somewhat truncately rounded, 5-6 times 

 as long as wide ; a single very narrow chloroplast with slightly 

 more than a single revolution. 



Length 23 a : breadth 4/i. 



Mass. : North Watuooa Lake, Fall River ! New to North 



America. 



* 7. Spirotaenia obscura crassum var. nov. 



Cells fusiform, attenuated toward the poles, the apices rounded ; 

 chloroplast axile, cristate, with several ridges, making about one 

 revolution : variety much smaller and comparatively shorter than 

 the typical form. 



Length 24 /jl : breadth I o //. 



Mass : South Framingham (May 1904) ! 



