100 FOSSIL MEDUS&. 
Genus MEDUSICHNITES Matthew. 
In an article on ‘Illustrations of the Fauna of the St. John Group, 
No. V,” Mr. G. F. Matthew reprints the description of Medusites princeps, 
M. radiata, and M. costata, as given by Linnarsson. He also describes, 
under the generic name Medusichnites,’ what he considers to be trails and 
imprints of tentacles of medusze. Five forms are figured. 
Through the courtesy of Mr. Matthew, I have been enabled to examine 
the original specimens, and I find that, with possibly the exception of fig. 1 
of his Pl. XIII, all of the varieties of Medusichnites may be referred to 
Fia, 26.—Medusites (?) latilobatus. Enlarged section of a slice cut from a typical specimen of this species. — 
markings of inorganic origin. I have seen large surfaces of Lower Cam- 
brian shale in Rensselaer County, New York, covered with markings like 
those shown by fig. 4 of Pl. XII and fig. 1 of Pl. XIII. These were 
studied in connection with the investigation of medusa-like trails, and the 
conclusion was reached that they could not have had such an origin. 
In order that the student may have the means of comparison with 
Eophyton, etc., I have introduced photographs (on Pl. XLVI) of some of 
the typical specimens described by Mr. Matthew. 
1 Trans. Royal Soc. Canada, Vol. VIII, 1891, Sec. IV, pp. 143-146. 
