Part first. 



Tank No. 3. 



Containing mainly Molluscs. 



1. Cephalopods (p. 89). *Sqiud or Calmar {Loligo, fig. 15), 



delicate, transparent and fish-like with large ej^es, swimming 

 with equal ease backwards or forwards. 



2. Snails (p. 93), Sea-hare (Aplysia, fig. i8), soft black or brown Imnps 



as large as a man's fist. *PleurobrancJms (fig. 21). *Umhrella 

 (fig. 19), with a flat shell on its back. Triton's horn ( Tritonium, 

 fig. 17) with red body and yellow horns banded with black; shell 

 pointed and shaped like a whelk; *Tun {Dolium, fig. 16), black 

 and white body, rounded shell; Murex (fig. 23), much smaller, 

 with spines; Helmet shell [Cassis, fig. 20); Natica (fig. 22). 



3. Bivalves (p. 95). Scallop [Pccten, fig. 25) with flat fluted shell; 



sometimes to be seen swimming by flapping the valves of the 

 shell. Edible mussel (Mytikis, fig. 24), a group attached to 

 a cable. Piddock {Pholas, fig. 27) and Lithodomns (fig. 26) 

 both in holes which they have bored in rocks or coral. 

 *Eggs of Molluscs. The squids and snails can often be seen lay- 

 ing their eggs in bands or clumps. Those of the Squids are 

 long white backs hanging from the dead coral; of the Sea- 

 hare, fine yellow strings; of the Tun ribbons a finger-length 

 broad, and of Murex large honeycomb-like masses. 



4. Crustaceans. *Homola (p. 85), standing as if on stilts, with the 

 hind legs held up. 



Plants. The lettuce sea-weed serves as food for the sea-hares. 



b\g. 15. Loligo vulgaris (Squid,, 1 o nat. size. p. 91. 



Fig. 16. Dolium galea (Tun;. 1/3 ii^t. size. p. 93. 



