1886.] MICROSCOPICAL JOURNAL. 129 



kk. Cell longer than wide, diameter yJ^__ to j^L-y in. (22-25//), 



margarittim^ So. 

 kk. Cell not longer than wide, end truncate ...... refzisu7u.,^o. 



U. Diameter ^j]r\-^ in. (12//), end truncate; sides convex, often obtusely 



angled centrally SchUephanckeanu?n^ 82. 



//. Diameter greater than (i3//) ^-^-^^-^^\\\. {mm). 



mm. Sinus acute inwardly thitJwphorzim^ So. 



mm. " rounded, but not widened, inwardly . . pseudogranattnn^ 15S. 



mm. " rounded and widened inwardly phaseohis..^\. 



nn. Margins crenate or dentate (cf). 



;?;?. Margins smooth ; centre with i verruca ; semi-cell elliptical ; diameter 



Woo i"- (i3'0 bireme, 82. 



00. Ends truncate; diameter y^ in. (33//) or larger {pp). 

 00. '• diameter -giy^ in. (28//) or smaller (rr). 



pp. About \\ times longer than wide ; diameter ^4^ to -^\-^ in. (33-50;/), 



triplicatum 73 ; speciosum^ 87. 

 pp. About \ longer than wide ; diameter ^]^-^ to g-i-j in. (65-707). 



supraspecios2im^ SS. 

 pp. About 1 longer than wide : diameter =1^^ in. (50,/), 



pych7iochondru7ii. 89. 

 rr. Diameter 7^-^-^ to -^^^-^ (20-26,7.) ; ends 4 crenate, sides 4-6 crenate, 



subcrenatum^ 84. 

 rr. " ,J^^ to y^W^ (20-25//) ; sides nearly straight. Ay eZ/wa;?//, 87. 



rr. " TTrinr to yt^Vo (H~i5.") ' gi"anules not radiate; end 4 crenate, 



Blyttii, Sj. 

 SS. Marginal teeth numerous, long, pointed or aculeate . Eloiseanum., 85. 

 SS. "• 17, emarginate-truncate .... quadrifariiim . 87. 



SS. Margins crenate (//). 



//. Basal inflation granulate in vertical lines {uu). 



tt. •• with scattered granules . . . psciidopcctiiioidcs. 89 



tt. " without granules, the marginal in 8 radiating lines, 



iias7(ti(]n., 89 

 7171 . .Sinus widening outwardly : granules geminate in rows. 



pccti/7oidcs., 88 

 7171. *• not widening outwardly ; cell oblong, diameter yl^, (33//.) , 



p7lIchcr/-77777{777 ., 9O 



1(71. " '' " cell orbicular, diameter .J J, (50//), 



/■ad/'os7(/77^ 90 

 vv. End truncate {zvw) . 

 vv. End not truncate {zz) . 

 unv. Diameter ^^^^ in. (50//.) or larger {xx) . 

 vjxv. Diameter smaller than (50//), j^\j-^ in. ( yy) . 

 XX. vSides granulate, concave near the ends ; semi-cell twice longer than wide, 



p/-ofract7t7/7, 83. 

 XX. Sides crenate-undulate, converging ; cytioderm verrucose, ^nas/lhts.S^. 

 XX. '' rounded, acutely toothed, ends usually nude ; cell as long as wide, 



Everctte77sc^ 85. 

 XX. " straight, diverging, \errucose ; angles rounded . . h/7-cf7(f77, 86. 

 yy. Cytioderm granulate ; cell widest at base, sides converging, sportcJla, 83. 

 yy- •■ '■ cell narrowed at base, sides straight, diverging, 



p/'Ot7(bc7'a7iS^ 84. 



yy. Cytioderm verrucose ; end more or less protruding and scolloped (4-cre- 

 nate) cc?latu77z, d,6. 



