38 



Part first. 



Tank No. 21. 



Fishes. On a dead Gorgonia-stem, a Dog-fish egg, with the embryo 

 moving inside. 



Fleshy Corals (p. 66). On the bottom, thick pink and white 

 branches of "Dead-mens' fingers" [Alcyonium, fig. 104); Seapen 

 {Pcnnatula, fig. 103), pink, hke a swollen ostrich plume. Both 

 of these can absorb water, thereby swelling up and extending. 



Hard Corals (p. 65). White Coral {Isis, fig. 105). In the back- 

 ground, above, Black Coral {Antipathes, fig. 106). De?idro- 

 ■phyllia, thickish grey branches with bright yellow tops (fig. 107). 

 Red Coral {Corallium, fig. 108), stem red, polyps white; this 

 is the coral used in jewellery. Sea-Fan {Gorgonia, fig. 109), 

 fan-like, red branches, in the background. 



Sea-anemones (p. 63). Alicia (fig. no). 



Hydroid-polypes (p. 6g). Delicate soft feathery tufts: Antennu- 

 laria (fig. in); Aglaophenia (fig. 112); Pcnnaria (fig. 113); 

 Tubularia (fig. 114). 



Polyzoa (p. 78). Retepora (fig. 115); Myriozoum (fig. 116). 



Sponges (p. 61). In the foreground the toilet-sponge [Euspongia, 

 fig. 117), inconspicuous, grey or brown colour, velvety surface, 

 a few large holes; Tethya (fig. 118) on the sand, like a rough 

 Tangerine orange. Axinella (fig. 119), red branches, thicker and 

 more irregular than the coral Gorgonia. Other kinds, white 

 brown or pink, bowl-shaped, or finger-shaped, on the rocks. 



Sea-weeds. Red algae: Vidalia, brown fronds. Green algae: 

 Valonia, glistening green ball-like bubbles, and Dasycladus. 

 Yellow or bright red corallines {Lithophyllum, etc.), hard and 

 calcareous and therefore resembling incrustations and stones. 



Fig. 103. Pcnnatula 



phosphorca (Sea-pen) 



in extended condition, 



^2 nat. size. p. 66. 



Fig. 104. Alcyonium palmatum 

 (Deadmen's fingers) with expan- 

 ded polypes, 1/2 nat. size. p. 6(i. 



