426 Lesquereux's Descriptions of 



69. Stigmaria umbonata (spec. nov.). Differs from Stig- 

 maria ficoides by the scars, which are at least twice as broad, 

 elevated, and with a single ring at the border. 



70. Stigmaria irregularis (spec. nov.). Stem deeply 

 and narrowly ribbed in its length ; scars distant and scarce, 

 oval, sometimes acute at both ends, sometimes round, placed 

 without order. 



71. Stigmaria radicans (spec. nov.). Stem about two 

 inches broad, narrowly striate in its length, scars irregular 

 and irregularly placed ; rootlets apparently round and nar- 

 rowed near the base. 



72. Stigmaria minuta (spec. nov.). Stem thick, lower 

 scars very small and close to each other, placed in a spiral or- 

 der, round ; the superior ones more distant, oval, pointed or 

 open in their inferior part, central scars elongated, like a deep 

 narrow line, dividing the general scars. 



Genus SIGILLAEIA. 



73. Sigillariasculpta (spec. nov.). Stem irregularly and 

 narrowly striate in its length, without ribs; striae undulate; 

 scars elevated, smooth, about an inch and a half distant, quad- 

 rangular-rhomboidal oblique, emarginate, cordate above, with 

 the three other angles acute ; vascular scars three, the medial 

 one oval, crosswise ; the lateral ones linear arched. 



74. Sigillaria fissa (spec. nov.). Surface striate in its 

 length by narrow, undulate, smooth lines ; without ribs ; scars 

 about one inch distant, cordate, obtuse in outline, deeply 

 emarginate above, round obtuse below, with two acute angles 

 at both sides, and a single oval, vascular scar, attached in the 

 middle of a semilunar or arched ring. 



75. Sigillaria dilatata (spec. nov.). Surface marked 

 with undulate, smooth, very narrow strise without ribs ; scars 

 one eighth of an inch distant, plane, enlarged on the sides, 

 being nearly twice as broad as high ; emarginate, cordate 

 above, very obtuse below ; lateral angles very acute ; vascular 

 scars three, the medial one broadly oval, crosswise ; the lat- 



