332 ECHIXoDKKMS OF (i III^KXSEV. 



HOLOTHURIAD^. 



CueumaPia pentaetes (Angular Sea-Cucumber^. Bordeaux. Vazon. 

 Not coiiiuion. This .species is very angular and has at each angle a 

 double row of suckers. Skin smooth and body about four inches long. 

 Colour generally deep purple, white, or a mixture of both. 



C. vulgaris (Common Sea -Cucumber). The common species of our shores. 

 It lives on shell gravel and broken stones. Four to six inches long, and 

 shaped like a cucumber. Colour usually brown, but sometimes yellow oi- 

 purplish. Tentacles 10, deep red and rather large. 



C. niger (Black Sea-Cucumber). Channel Islands (Sinel;. Not common. 

 This species lives in rock crevices at extreme low tide. About 8 inches 

 long, creamy-white, with a cluster of jet-black tentacles. 



SIPUNCULIDiE. 



Sipuneulus bernhardus (The Shell-bearing Sipunculus). Guernsey and 

 Alderney (Ansted). So called because it lives in a shell, generally a 

 Turritellu, when not buried in the sand. Its shape is never constant, but 

 the usual form is like a worm with half its body bulged out. The un- 

 bulged part is completely retractile into the other half. 



S. Johnstoni. Sark (Ansted). Much smaller than the last, but of the same 

 shape, being only half an inch long. It lives in sand at extreme low 

 water, and among corallines. 



Synapta digitata. Guernsey and Jersey. This is about I or 5 inches 

 long and is like an ordinary pencil both in size and shape. Tentacles 10. 

 The skin is covered with little anchors by which it clings to the hand. 

 Habitat, sand at low water. 



S. Galliennii. Commoner than the preceding. Bordeaux. Havelet Bay 

 (Wright). This si^ecies is much smaller than the last, and the anchors 

 have serrated points, while those of S. digitata are simple. Habitat, same 

 as before. 



BalanOglOSSUS sarniensis. Herm (Sinel). This is an animal whose 

 affinities are very difficult to decide. In its larval stage it resembles the 

 true Echinoderms, while the adult is a worm-like body having a length of 

 two feet. At the anterior end there is a proboscis, around which is a frilled 

 collar. The presence of slits behind this suggested the gill-slits of the 

 vertebrates, and has given ground for the supposition that Balanoylossus is 

 allied to the higher animals. 



A study of the contents of my own aquarium, as well as 

 the one at the Guille-Alles Library, and also the one at the 

 Intermediate School, has furnished me with the following 

 particulars Avhieh may be useful. Brittle Stars do not hve 

 well, while dnnatala may Ije ke[)t alive for some time, but it 

 is uncertain. CribcUa oculata and Astcruia g'lhbosa do well in 

 the tank, and may be kept for a long time. The former, 

 liowever, is addicted to rotting. The arms become white and 

 fall away, but tliis does not very often happen. The Sea- 

 Urchins do not thrive at all. I have often had the tank 

 spoilt by a specimen of E. Uvidus dying within a day or two 

 of its introduction. Cucwmarla peiitactes does extremely well. 

 It is always moving round and round the tank Avith its tenta- 

 cles expanded. And the same thing may be said also of 

 iSyuapta Gallieniiu. 



