216 MR. K. W. BINNEY ON A FOSSIL PLANT 



specieSj and^ indeed^ a marine or^ rather^ a brackish plant, 

 closely related to the species of the present genus Chorda, 

 Stack. This fragment seems to have been mixed in the tide- 

 pools with freshwater or land plants growing there ; for 

 another thick specimen of the same locality and compound 

 bears a profusion of marine moUusks, and has only branches 

 of this as yet undescribed marine species, Calamophycus 

 septus. 



''Habitat. Lower Helderberg Sandstone, Michigan; dis- 

 covered and communicated by Dr. Carl Rominger (State 

 Geologist) :' 



The woodcut below represents the specimen a little over 

 the natural size. 



On comparing my Manx specimen, which was found on 

 the surface in a field at Laxey, with that figured and de- 

 scribed by Prof. Lesquereux ; it agrees with the latter in 

 every respect, except that strise and scales are not ob- 

 servable on the stem. The stem is thick, dichotomous ; 

 divisions variable in distance, the terminal ones short. 



