CLATHRARIA LYELLII. 295 



the chalk marl cf the Undercliff, mentioned in a 

 previous chapter (Chap. VIII. p. 244), as having 

 been discovered by Captain Ibbetson, and now 

 exhibited in his collection of Isle of Wight fossils, 

 in the Polytechnic Institution. This invaluable 

 relic is admirably represented by Mr. Dinkel,* 

 and engraved by Mr. Lee, in lign. 23, p. 297. 



This specimen consists of the summit of the 

 stem, and is fifteen inches in length ; the appear- 

 ance of the lower end shows that some portion 

 has been broken off and lost. The stem is com- 

 pressed into an elliptical form ; the figure exhibits 

 the longest diameter, and the side on which the 

 characters of the plant are best preserved. On 

 the upper 10| inches, this trunk is covered by the 

 petioles or leaf-stalks ; and these appendages re- 

 main on one side almost to the lower extremity. 

 The surface of the inferior portion, to the extent 

 of four inches, is marked with transverse lozenge- 

 shaped scars, produced by the separation of the 

 petioles ; the internal axis appears at the fractured 

 end: see lign. 23, a. The leaf-stalks are from 



* This eminent artist now permanently resides in London ; being engaged 

 at the British Museum by Dr. Falconer, on the illustrations for the impor- 

 tant work on the Sub-Himalayan Fossils, which is now in progress of pub- 

 lication. For subjects requiring talent, accuracy, and knowledge of animal 

 and vegetable organization, for their successful delineation, the pencil of Mr. 

 Dinkel will be found invaluable. 



