58 FOSSIL MEDUS 4. 
as the type of his Medusites favosus = Dr. Torell’s Protolyellia princeps. This 
has been noticed under the description of that species (p. a) 
I have reviewed Dr. Nathorst’s comparisons, and think that they are 
very suggestive. My knowledge of living medusze is so limited, however, 
that any opinion I might give would have little weight. I hope that some 
naturalist will take up the subject anew and make an extended series 
of experiments, so that the basis for the comparison of the fossil and 
living forms may be greatly extended, and Dr. 
Nathorst’s conclusion be thus strengthened or 
modified, as the case may be. 
Through the kindness of Dr. Karl Zittel, I 
recently received a cast of a Medusites found 
at Tejrovic, Bohemia, in the Middle Cambrian 
beds. The form was described and illustrated 
by Dr. J. F. Pompeckj,' whose description is 
as follows: 
Fic. 16.—Reproduction of the type The impression figured (the only one) agrees in a 
ae ens radiata? of Bohe- general way with the figures given by Nathorst, loc. 
cit. fig. 1. Some differences forbid the direct identifi- 
cation of the present form with the Swedish form, The string-of-pearls shape of 
radii, already noted by Linnarsson, can not be observed, and the number of radii 
in the Bobemian specimen is less than in Linnarsson’s species. On the outer edge 
I estimate in the present specimen about 75 to 80 radii, while Nathorst counted 
almost twice that number in Medusites radiatus. The intervals between the radii 
are larger in our species. The forking of the radii is analogous to that in the 
specimens figured by Nathorst, loc. cit., fig. 1. 
The specimen was found at a locality near Tejiovic, on the left border 
of the Beraun River, in a gray-brown sandstone. The following species of 
the Middle Cambrian fauna are associated with it: 
Paradoxides rugulosus Corda. Ptychoparia striata Emmr., sp. 
Paradoxides spinosus Boeck, sp. Ptychoparia (Con.) emmrichi Barr., sp. 
Paradoxides rotundatus Barr. Ellipsocephalus germari Barr. 
Agraulus ceticephalus Barr., sp. Orthis romingeri Barr. 
Agraulus spinosus Jahn, sp. Stromatocystites pentangularis Pompeckj. 
Agnostus nudus Barr Lichenoides priscus Barr. 
Couocoryple sulzeri Sechloth., sp. Mitrocistites, sp. 
Conocoryphe(Cten.)coronata Barr.,sp. 
1 Die fauna des Cambrium von Tejiovie und Skrej in Béhmen, von. J. F. Pompeckj: Jahrbuch 
K.-k. geol. Reichsanstalt, vol. 45, parts 2 and 3, 1896, p. 501, pl. 14, fig. 3. 
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