54 FOSSIL MEDUS 2. 
The piece was washed out on the shore of Ontika, in Esthonia; was found at the 
foot of the Glint, and donated to the Reval provincial museum by Baron Hermann 
Yoll-Kuekers. Judging by the rock, it belongs evidently to the sandy layers inter- 
calated in the upper blue clay, in which the Cruzianas and Fraenas of the Eophyton 
sandstone were also found. Further finds may be expected.! 
I fully agree with Mr. Matthew, that the original name given by Torell, 
costata, should be retained for this species. 
MEDUSINA PRINCEPS Torell (sp.). 
JEM; OWA tare, aL 
Protolyellia princeps Torell, 1870. Lunds Universitets Arks-Skrift, 1869, No. VUI, 
p. 10. 
Astylospongia radiata Linnarsson (ex parte?), 1871. Kongl. svensk. Vet.-Akad. 
Handl., vol. 9, No. 7, p. 13, Pl. II, fig. 15. 
Medusites favosus Nathorst, 1881. Kong]. svensk. Vet.-Akad. Handl., vol. 19, No. 1, 
p. 25, Pl. V, figs. 5 and 6? 
Medusites princeps Matthew, 1890. Trans. Royal Soc. Canada, Vol. VIII, Sec. IV, 
p. 140. 
The original description is as follows: 
Obicularis, pileo fungi similis, margine distincto; superficies superior convexa 
interdum impressione media, calcibus nullis insigni; inferior plano-convexa medio 
pedunculo brevi affixa et caleybus polygonis obliquis complanatis, ut in Alveolite. 
Diam. calycum, 1-2™"; diam. speciminis maximi, 72™™; crassitudo, 20™™. 
Locus: In saxo formationis cambrice ad Lugnas, Vestrogothiz. 
In the remarks following the description the species is compared with 
Archeeocyathus Billings, to show that it has no affinities with it or the - 
sponges, and that its relations are with the genera Lyellia and Alveolites of 
the corals. 
Dr. Nathorst points out the differences between Dr. Torell’s species, 
P. princeps and M. radiata, and describes the former as a new species, 
Medusites favosus, as follows: 
A species probably belonging to the acraspedote medusz, family Cyaneidze, 
with circular gastric cavity, whose roof (or bottom), bounded by the umbrella, is 
divided into irregularly polygonal fields by small furrows. Diameter of gastric 
cavity generally about 35-40™™, though specimens are found both smaller and twice 
as large. 
Dr. Nathorst says (in a footnote) that the specific name princeps can 
hardly be retained, considering the present view of the nature of the fossil. 
'Mém. Acad. imp. sci. St. Pétersbourg, 7th series, Vol. XXXVI, No. 2, 1888, p. 27. 
