1886.] MICROSCOPICAL JOURNAL. 145 



i. Basal lobes deeply notched (jv) • 

 /. " undulate (z) . 



j. Cytioderm rough with conic granules ; semi-cells with i large central 

 inflation, a smaller one on each side, 2 on end lobe, verrucosutn^ 100. 

 k. Basal lobes undulate (cc). 

 k. "• rounded or angular (ee). 



/. A short spine on the angles of end and basal lobes . divaricatjim^ 104. 

 /. A small projection on each side near the apex . . conipactuvi^ 107. 

 in. Cytioderm more or less tuberculate {n) . 

 m. " punctate (o). 



m. " smooth (r). 



n. Tubercles basal, mostly 5 cii'culare^ loi. 



n. " 5 central, 4 marginal elegans., 106. 



n. " scattered ; end lobe with a tooth on each side, 



07'7tithocephaluni .* 

 0. Semi-cell 5-lobed, basal lobe emarginate, the lateral small, entire, 



pinnatum^ 98. 

 o. " not 5-lobed (/). 



p. Basal lobe with i lateral, subcentral tubercle, not emarginate, 



amptiUaceum^ 100. 

 p. Basal lobe without lateral tubercle, slightly emarginate, . affi-ne^ 100. 

 p. " " " " not emarginate, 



or)iatuin^ 97 ; di delta., 99. 

 r. Semi-cell subrectangular, basal lobe very broad, end lobe partly included 



between the lateral crasstan., 97 ; ventricosnni^ 160. 



r. Semi-cell more or less pyramidal (5) . 



s. Diameter -g^i^^ in. or more (50-55//) Everettense., 102. 



s. " less than -^\-^ in., 



Porkoi'ftyaittitn, 104; erosum^ 104; elegans^ 106. 

 /. End lobe on a long slender neck ; basal lobe with 6 protuberances, 



viammiUosjan^ 102. 

 /. " " " " basal lobe without protuberances, 



insigne., 102. 

 t. End lobe not on a long neck (?/). 

 u. Basal lobe much wider than the end lobe (z") . 



u. " scarcely wider ; diameter less than g^J,j in. (43//.) , 5?w//fA% 106. 



V. Basal sinus narrow, basal lobes approximate . . • . ansatiim., 99. 

 V. " wide, basal lobes widely separated . . interincdium.1 102. 



w. End lobe beaded ; angles of basal lobes beaded . . ventricosuin, 160. 

 w. " dentate ; angles of basal lobes dentate . . . simplex., 106. 



w. " smooth, its angles spinous or cuspidate . . rostratum., 106. 



X. Angles of end lobe and margins of basal each with 3 diverging spines, 



Ciispidatiitn., 105. 

 X. " '' with short spines, margins of basal dentate or granu- 

 late abruptum., 107. 



X. Angles of end lobe with one cusp or spine .... I'ostratuin., 106. 

 y. Basal and central lobules both slightly emarginate . . oblongnm., 98. 

 y. Basal lobes slightly emarginate, central obtuse . . multilobattini^ 98. 

 z. End lobe columnar, margins nearly parallel, end truncate 



atte7iuatu7n. 103. 

 z. End lobe not columnar, partly included between the lateral lobes, 



oblongtim., 98. 

 z. " " not included {aa). 



* Journ. R. Micr. Soc, Feb., 1886. 



