Tank Nr. 20. 



31 



Tank Nr. 20. 



Pelagic Animals (see Note on p. 62). These show best 

 in bright sunshine (from noon to two); many do not 

 live long, and the tank is richest after a calm dull day. 

 The more delicate are in wide glass cylinders. There 

 may be: 



Jelly fish. A. Medusae (p. 60). Cotylorhiza (fig. 80, from 

 September to January), nearly a foot across, like a mush- 

 room growing from an inverted cauliflower. Rhizostoma 

 (fig. 79), as large, a beautiful white globe with a violet 

 border and a swelling violet and white stalk. Pelagia 

 (fig. 81) white with numerous spots. Carmarina (fig. 83), 

 two or three inches long, umbrella-shaped, perfectly 

 transparent, with four long fishing-lines. Tima (fig. 82). 

 Olindias (fig. 84). B. Ctenophora (p. 62), have each 

 eight lines of moving paddles which look like running 

 beads of light. Beroe (fig. 86), one to three inches long, 

 shaped like a bishop's mitre; a most delicate pink. 

 Eucharis (fig. 85), much broader base with rounded pro- 

 jections, quite transparent. Callianira (fig, 87), small 

 with long tentacles. Venus's Girdle (Cestus, fig. 88), a 

 transparent ribbon about an inch broad. C. Siphono- 

 phora (p. 61), generally like transparent filmy flowers 

 on a central stalk: Physophora (fig. 89), Forskalia (fig. 92), 

 Velella (fig. 91), Hippopodius (fig. 90), etc. 



Fig. 79. Rhizostoma 

 j)ulmo, small specimen. 

 , 60. 



Fig. SO. Cotylorhiza 



borbonica, 

 J /2 nat. size. p. 60, 



Fig. 81. Pelagia 



noctiluca, 

 J /3 nat. size. p. 60. 



