58 



FOSSIL MEDKS.E. 



) 



as the type of his Medusites favosus ~ Dr. Torell's Protolyellia princeps. This 

 has been noticed under the description of that species (p. 55.) 



I have reviewed Dr. Nathorst's comparisons, and think that they are 

 very suggestive. My knowledge of living medusae 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 Tejfovic, Bohemia, in the Middle Cambrian 

 beds. The form was described and illustrated 

 by Dr. J. F. Pompeckj, 1 whose description is 

 \. " ^ as follows: 



fig. le—Tierroduotinn of the type The impression figured (the only one) agrees in a 



figure of xedwina radiata .'of Bohe- genera ] way w {th the figures given by Nathorst, loc. 



mia. Pompeckj . " 



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 Linnarssou, can not be observed, and the number of radii 

 in the Bohemian specimen is less than in Linnarsson's species. On the outer edge 

 I estimate in the present specimen about 75 to SO 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., tig. 1. 



The specimen was found at a locality near Tejfovic, 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. 

 Paradoxides spinosus Boeck, sp. 

 Paradoxides rotundatus Barr. 

 Agraulus ceticephalus Barr., sp. 

 Agraulus spinosus Jahn, sp. 

 Agnostus mulus Barr 

 Conocoiyphe sulzeri Schloth., sp. 

 Conocory phe ( Cteu. ) coronata Barr.,sp, 



Ptychoparia striata Emmr., sp. 

 Ptychoparia (Con.) emmricbi Ban., sp. 

 Ellipsocephalus gennari Barr. 

 Orthis romingeri Barr. 

 Stromatocystites peutaugularis Pompeckj. 

 Lichenoides priscus Barr. 

 Mitrocistites, sp. 



■Die fauna des Cambrium von Tejfovic iind Skre.j in Bohmen, von. J. F. Pompeckj : Jalirbucu 

 K.-k. geol. Reiohsanstalt, vol. 45, parts 2 and 3, 1896, p. 501, pi. 14, ag. 3. 



