THE AQUAVIVARIUM. 



adapted for the Aquavivarium is the Serpula con- 

 tortuplicata (Fig. 27). This creature is a study 

 of itself : look at that curved case attached to a 

 stone or a rock, an old bottle or a shell. How curi- 

 ously formed \ that tuft of orange-coloured hairs 

 is its gills, and the long red funnel is a sort of 

 stopper with which it corks itself up when it- 

 retires into its tube. There are many other Anne- 

 lides, such as the Sea Mice (Aphroditce) and the 

 Nereids, which may be kept and watched with 

 interest. 



Four portly volumes in "Van "Voorst's delightful 

 series of works on British Natural History are 

 devoted by the late Professor Edward Forbes and 

 Mr. Hanley to the subject 

 of the Mollusca of our own 

 islands alone. The majority 

 of these are marine. Every 

 shore abounds with some of 

 them, and everywhere the 

 Periwinkle (Litorina litorea), 

 Fig. 28, may be secured as 

 a scavenger for the con- 

 fervse, which grow as vigor- 

 ously in sea as in fresh 

 water. How many of these 

 creatures we cannot even 

 mention the fortunate pos- 

 sessors of Forbes and Han- 

 ley's work will see. We 

 give the figure of an Asci- 

 dian Mollusk (Ascidia men- 

 tula), Fig. 2 9, because of their 

 presenting quite a different 

 type of organization to the 

 other Mollusca we have men- 

 tioned. Those two holes are 



FIG. 28. 



