JURASSIC. es Tal 
Dr. Haeckel characterizes this species as follows:! 
Medusa disk circular, 80" in diameter; mouth surrounded by 4 feeding arms, 
which are about 80™" long and 10™ broad ; stomach cavity with 4 (radial) three-cor- 
nered pouches of 10™™ to 12™™ diameter ; between the latter, 4 (interradial) elliptical 
genital pouches of 8"" to 10" diameter ; 16 (unbranched ?) radial canals (4 perradial, 
4 interradial, and 8 adradial); a rim canal; 16 marginal bodies(?). Umbrella rim 
Fic. 17.—Restoration of Semzxostomites zitteli. Natural size. (After Haeckel.) 
a, gastral cavity and mouth opening; 0, oral arms; ¢, adradial papille; d, gastral pouch; e, circular mound on the 
periphery of the stomach pouch and genital pouch; f, the smooth zone; g, genital pouch; h, ring canal; i, marginal lobe; 
k, radial canals (k,, perradial; ky, interradial; k, adradial); 1, marginal tentacles. 
split up into 120 to 128 narrow marginal lobes, between which arise an equal number 
of marginal tentacles 30™™ long. 
The following notes are from an abstract of Dr. Haeckel’s remarks on 
the species:? 
Even a superficial examination of this fossil shows that it represents one of the 
higher medusz of the order of the Semostome. [tis an acraspedote or phanerocarpous 
medusa, with a central mouth opening, + feeding arms, and numerous marginal lobes. 
' Jenaische Zeitschr., Vol. VIII, 1874, p. 329. > Loc. cit., pp. 323-329. 
