JURASSIC. 



71 



Dr. Haeckel characterizes this species as follows: 1 



Medusa disk circular, 80 n,m in diameter; mouth surrounded by -4 feeding arms, 

 which are about 80 ram loug and 10 mm broad ; stomach cavity with 4 (radial) three-cor- 

 nered pouches of 10 mm to 12 mm diameter ; between the latter, 4 (interradialj elliptical 

 genital pouches of 8 mm to 10 1 "" 1 diameter ; 16 (un branched?) radial canals (4 perradial, 

 4 interradial, and 8 adradial); a rim canal; 16 marginal bodies ( ?). Umbrella rim 



/- 





. a 

 c 



I 

 kt 



k* 







Fig. 17 — Restoration of Seniteostoniites zitteli. Natural size. (After Haeckel.) 



a, gastral cavity aud mouth opening; b, oral arras; c, adradial papilla}; d, gastral pouch; e, circular mound on the 

 periphery of the stomach pouch and genital pouch ; /, the smooth zone ; g, genital pouch ; h, ring canal ; i, marginal lobe ; 

 k t radial canals (k lt perradial; k?, interradial; A^, adradial) ; I, marginal tentacles. 



split up into 120 to 128 narrow marginal lobes, between which arise an equal number 

 of marginal tentacles 30 mm long. 



The following notes are from an abstract of Dr. Haeckel's remarks on 

 the species: 2 



Even a superficial examination of this fossil shows that it represents one of the 

 higher medusa? of the order of the Semostomre. It is an acraspedote or phanerocarpous 

 medusa, with a central mouth opeuiug, 4 feeding arms, and numerous marginal lobes. 



1 Jenaische Zeitschr., Vol. VIII, 1874, p. 329. 



-Loc. cit., pp. 323-329. 



^A? 



OS* 



c 



Cr * 







IBR 





ct 



