14 



II. Sulciculmis and Striaticuknis of Luid, PL V, 184, 6; 

 Scheuchzer, P/. IV, 1. ; Volkmanni Sites. Subter. VII, 7 ; 

 VIII, 6; Martin, 8, 25, 26; Organic Remains, I, PL III, 3, 

 with a reeded, jointed trunk, is said to resemble the young 

 shoots of the Surinam bamboo. 



III. Phytolithus Cancellatus. Volkman. Siles. Suht. 

 VIII, 10, 11, 12, 13; Martin, 13, 50; Organic Remains, 

 vol. i, PL I, 6, II, 4. Mr. Steinhauer has taken consider- 

 able pains to detect and explain the different appearances 

 under which the fossil remains of this plant are seen. He 

 has ascertained that there are three distinct kinds of con- 

 figurations proceeding from it, originating in the epidermis, 

 the bark, and that which may be considered as holding the 

 situation of the wood of the plant. The first, the epidermal, 

 is formed of rhombs, divided by lines forming a network in a 

 manner difficult to express by drawing or description, which 

 leaves the rhornbs still approximate. The impression of 

 this part is represented PL I, fig. 4. In the second, the 

 cortical, the lines between the rhombs are of more breadth, 

 the ridge is broader and less defined, and forms with the 

 contracted superior elevation a protuberance, and the cen- 

 tral part assumes the figure of a squamula. PL I, fig. 5, 

 represents the matrix or cast of this part. The third, the 

 ligneous, configuration differs extremely from the two 

 fi^rmer, and only close observation determines that it ori- 

 ginates from the same plant. The cancellated appearance 

 is here entirely lost ; the surface is slightly striated with 

 a scarcely perceptible rising under the central ridge, and 

 a minute but distinct raised dot in the place of the de- 

 pression in the epidermis. It has all the appearance of a 

 peeled plant, which has been furnished with small branches 

 or spines in quincuncial order (PL I, fig. &). From the 

 various modifications of these forms, the different aspects 

 of this protean fossil, Mr. Steinhauer thinks, may be 

 explained. 



