446 PALAEONTOLOGY OF ILLINOIS. 



SIGILLARIA MASSILIENSIS, Sp. nov. 



PI. xxv, fig. 3 and 4. 



STEM ribbed, ribs flat, half an inch broad, with intermediate, 

 deep, sharply cut furrows ; surface striated lengthwise by dis- 

 tinct, nearly continuous lines, scarcely flexuous on the bor- 

 ders of the cicatrices ; cicatrices larger, one-third of an inch 

 long, not quite as broad or half as broad as the ribs, rhomboi- 

 dal, rounded at the top, enlarged downwards to the angular 

 sides, obtusely pointed at the base, minutely, obscurely striate 

 on the surface; vascular scars three, the lateral ones semi-lu- 

 nar, caudate, vertical ; the medial one horizontal, large, oval. 

 The cicatrices are separated from each other by a space equal 

 to their length. The form of the decorticated cicatrices is not 

 known. 



This fine species is allied to Sigillaria intermedia, Brgt., differing in its pro- 

 portionally larger cicatrices, and by the regular striation of the ribs, without 

 cross wrinkles at the base of the cicatrices, and by their angular base. 



In the sandstone at Marseilles. 



SIGILLARIA MONOSTIGMA, Lesqx. 



PI. xxvi, fig 5. 



This species is referred, with some doubt, to the one published in vol. ii of 

 this Report, p. 449, pi. 42. It represents a part of a trunk or branch, four 

 inches broad, flattened to one-half an inch in thickness, marked all around in 

 the general quincunxial order by broadly rhomboidal scars, with a round point 

 in the middle, exactly of the same form as those of the cortex of Sigillaria 

 monosti(jma, and at the same comparative distance. These scars are placed at 

 the top of an inflated lanceolate cauda, three-fourths of an inch long. This 

 kind of half cylindrical appendage attached to the specimen evidently under 

 the cortex, gives to this species the character of a Knorria. If, as Prof. W. 

 P. Shimper will have it, in his Vegetaux fossiles du terrain de Transition des 

 Vosges, p. 33, Knorria, as a genus, differs essentially from Lepidodendron by 

 the cicatrices having a single central vascular scar, our species should be con- 

 sidered as a true Knorria. But the same author denies the existence of any 



