1886.] MICEOSCOPICAL JOURNAL. 113 



k. Ends separated 7-10 times the diameter ; width -^1,^ to y^^Vf ^^' (25-28 />.), 



acziminatum^ 44. 

 k. Cell 6 to S times longer than wide, ends obtuse ; width yWs i"^- (^4 !'■) ^ 



Jenneri^ 44. 

 k. " " " " width ^Jyo in. (i3 //), 



pai'vulum, 45. 

 k. Cell 8 to 12 times longer than wide, nearh* semicircular, ends sharp; 



width 2tVo" to stVtt i"- (S-io :>■) Vemis, 44. 



/. Cell stout, ends broadly rounded ; width ^i^ to joVu in (25-30 //) 



cucumis^ 40. 

 z-'^. Beaks slender, nearly as long as the body, ends obtuse, curved, 



Kuetzingii^ 47. 

 in. Beaks thin, \ as long as the fusiform body ...... rostrattim^ ^6. 



14. DOCIDIUM. 



§ Suture a projecting or conspicuous rim (a). 



§ Suture not projecting (<^). 



a. Cytioderm hirsute : semi-cell with 3 or 4 undulations . spinosum^ ^\. 



a. Cytioderm not hirsute (<^). 



b. End dentate or crenate ; semi-cell with i basal inflation (c). 

 b. •' " •' semi-cell with 4 regular inflations, 



co)istrictnm^ 50. 

 b. End truncate or rounded ; semi-cell with i or 2 basal inflations, 



Trabecular, 48 ; truncatum, 48. 



b. " "" " semi-cell undulate to the contracted end, 



crennlatujn., 47. 



c. End with 1 tooth on each angle Flowtowii., 49. 



c. End crenulate ^vith tubercles corona turn ., 49. 



d. Cytioderm hirsute ; base of semi-cell slightly inflated . /a'rsnii/ni, ^i. 



d. Cytioderm not hirsute (e). 



e. End dentate or crenate (y ) .^ 



e. End not dentate nor crenate (y). 



f. vSemi-cell with 4 or more inflations {h) . 

 f. " with whorls of quadrangular prominences . verr?/cosi//n^ '^z. 



f- ••' with 20 or more constrictions costat?(>n^ 53. 



f. " with I inflation {g") . 



g-. End with numerous pearly teeth or beads ... coronjdlatnm., 49. 



g. End with prominent teeth, about 3 in view .... trident ulum^ 52. 

 h. End with 3-5 minute tubercles ; semi-cell with 4 or more undulations, 



Floridensc., i 59. 

 //. End with toothed angles (/). 

 /. Semi-cell with 4 prominent nodes ; 8 to 10 times longer than wide, 



nodosum, 50.. 

 i- '' " 4 constrictions; 10-12 times longer than wide, breve, 51. 



i- '' "8 constrictions ; 20-24 times longer than wide, 



siniiosnni, 51 . 

 j. Semi-cell with i basal inflation (/-)• 

 /. " undulate to near the end (/). 



j- " not or slightly undulate ; densely granulate . . breve, 158. 



k. Cytioderm densely, irregularl}^ punctate . . . . . clavatum, i\%. 

 k. "• smooth ; ends truncately rounded . . . . Bacuhim, 49. 



k. " '' ends round ; cell minute .... minutum, 52. 



/. Diameter jiy'^Tr in. (25 //) ; about 20 times longer than wide, 



repandum, 50. 



