PLATE XLIV. 



Medusina dbpeedita (p. 91). 



Fia. 1. Plaster impression of a limestone slab from the lithographic slates of Eichstadt (white 

 Jura coral limestone) , with an impression of Medusina deperdita. The medusa is drawn 

 to the natural size. (After Haeckel.) 

 c. Marginal canal (ring canal in the umbrella rim). 

 (j. Expansion in the middle of the radial canal (genitalia?). 



m. Mid-field of the medusa impression, corresponding to the stomach and mouth. 

 p. Periphery of the gelatinous mantle (margin of the impression). 

 r. Radial canals, 

 s. Shallow circular furrow in the slab surrounding the impression of the periphery of the 



mantle. 

 u. Broader ring about the disk ring (thickness of the gelatin substance of the medusa which 

 has been pressed flat) . 



ACRASPEDITES ANTIQUUM (p. 7.")). 



Fig. 2. A limestone slab from the lithographic slates of Eichstadt, with an impression of Acraspe- 

 dites antiquus. The diameter of the figure is in relation to the original as 5 to 7. (After 

 Haeckel. ) 

 c. Marginal canal (ring canal in the umbrella rim). 



g. Lobe-shaped elevation, rising from the mid-field, between each two radial canals (genitalia?). 

 h. Periphery of the genital mounds. 

 i. Indentation of the umbrella edge, corresponding to the anastomosis of each radial canal 



into the marginal canal. 

 m. Mid-field of the medusa impression, corresponding to the stomach and mouth. 

 p. Periphery of the gelatinous mantle (margin of the impression). 

 /'. Radial canal. 



s. Shallow circular furrow in the slab surrounding the impression of the periphery of the 

 mantle. 



Medusina porpitina (p. 95). 



Fig. 3. (After Haeckel.) See description in text. 



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