1886.] MICROSCOPICAL JOURNAL. Ill 



b. Ends rounded, not spinous ; cells deeply constricted . Jiliforme^ 29. 



b. Ends truncate, concave Wallachii^ 31. 



9. Onychonema * 



1. Cells with spine-like projecting ends - . . serrati/ni, 30. 



2. Cells without spine-like ends No7'dstedtlanujn.\ 



10. Mesot^nium. 

 I. Cells cylindrical («). 



I. Cells oval or elliptical, about twace longer than wide, in mucus on wet 

 wood micrococcum.^ 32. 



a. Mucous masses floating ; cells 2-2^ times longer than wide, Braunii^ 31. 



a. Mucous masses mingled with -filamentous algas ; cells 3-4 times longer than 

 wide Endlicherianum^ 32. 



a. Mucous masses on wet rocks and mosses ; cells 2-3 times longer than 

 wide clepsydra, 2)'^. 



11. Spirot^enia. 

 I. Spiral band single ((?). 



I. Spiral bands more than one obscut-a, 33. 



a. Cell 8 to 10 times longer than broad condensata, 33. 



a. Cell 4 times longer than broad bryophila, 33. 



12. Pexium. 

 I. Chlorophyll interrupted by i central transverse band (a). 

 I. " " by 3 transverse bands . . interruptuin, "i^K^. 



I. Chlorophyll concentrated into 2 or more nuclei ; in mucus, crassa, 37. 

 I. "• diffused (/;) . 



a. Ends truncate, square truncaUim, 35. 



a. Ends not truncate ; cells slightly constricted .... ?ninutii.in, 35. 

 a. " " cell not constricted, 3-5 times longer than wide, 



digiUis, 34. 



a. " " cell not constricted, 5-6 times longer than wide, 



closterioides, 35. 



b. Cytiaderm smooth (r). 



b. '' - with pearly granules in longitudinal rows, 



margaritacenm, 34. 

 c. -Cells in mucus, diameter ^1^ to ^1^ in. (63-83//.) . . oblong-tun, 34. 



c. " " diameter -i^Vtt to yirVo ii"*- (20-25//) • rupestre, 37. 



c. " "• diameter Y^i— to J Jg^ in. (16-17//) • Bi'cbissonu, -7^6. 



d. Cells oblong, often slightly constricted lan/ellostim, 34. 



d. Cells subcylindrical, in families of various sizes intermingled, 



polyiuorp/iiim, 36. 



d. Cells subcylindrical, not in families yenucri, 36. 



d. Cells broadly fusiform, 4-5 times longer than wide . . navlcula, 36. 



13. Closterium. 



§ Ends not or but slightly produced (i). 



§ Ends produced into long, often setiform, beaks (2). 



I. Cells straight or slightly curved ; ends slightly tapering (a). 



I. *' " '' dorsum convex, ventrum nearly 



straight _(^). 



I. Cells conspicuously curved; ventrum concave, with a central infla- 

 tion ( /) . 



1 . Cells conspicuously curved ; ventrum without an inflation ( /) . 



2. Body margins equally convex ; beaks longer than the body, cctaceum, 47. 

 2. Body mai'gins not equally convex {nt) . 



* Mr. WoUe joins this to Sphcerozosnia. t yourn. R. Micr. Soc, Dec, 1885. 



