Mr. H. J. Carter on Meyenia fluviatilis. 179 



fissured as in Lepidodendron Veltheim{anum\ this is seen in 

 the fossils illustrated in figs. 5 & 13, Pis. IV. and VII. 



Sigillaria Taylori, Carruthers, sp. 



In form the leaf-scars in this species are essentially of 

 the same type as those occurring in Sigillaria discophora^ 

 Konig, sp. They are small and seldom occur in so good a 

 state of preservation as to give a clear idea of their form. I 

 have, however, succeeded in securing several examples which 

 afford the necessary details on this point. In fig. 6, PL IV. 

 (specimen No. 16), the form of the leaf-scars is well seen. It 

 is remarkable that on one small part of this fossil they should 

 be so well preserved, and on all the rest of its surface be com- 

 pletely effaced. The upper and larger Ulodendroid scar 

 appears to have been displaced. 



The leaves of this and the previous species seem to have 

 remained attached to the stem for a considerable time, and 

 very often their being buried in the matrix appears to have 

 given the outer layer of the bark a tendency to adhere to the 

 impression side of the slab when the stones were split ; when 

 this happens there is presented to our view the form of the 

 leaf-scars as seen on the inner surface of the outer layer of the 

 harJc. This condition is exhibited at the part marked hj 

 fig. 10, PI. VL, which is shown of the natural size in fig. 10b. 

 Fig. 12, PI. VII., shows a like state of preservation. 



At various parts of the specimens of Sigillaria discophora 

 and Sigillaria Taylori are shown their decorticated conditions, 

 for which Lindley and Hutton founded the genus Bothra- 

 dendron (PI. VII. fig. 13 h, and PI. VI. fig. 10 d), 



[To be continued.] 



XIX. — On a Variety of the Freshwater Sponge Meyenia 

 fluviatilis, auctt.^from Florida. By H. J. Cartek, F.R.S. 

 &c. 



Next to Mr. Ed. Potts, of Philadelphia, comes Mr. Henry 

 Mills, of Buffalo, in the discovery of freshwater sponges in 

 his particular locality, and in the praiseworthy desire to 

 advance the subject by sending specimens of them to Euro- 

 pean as well as American naturalists. Of the species in the 

 Niagara Kiver Mr. Mills has long since forwarded to me 



