384 THE TINY OCEANIA. 



composed of a mosaic of minute pebbles, bits of shell, 

 &c., imbedded in a glutinous silk with which the 

 interior is smoothly lined. In our little Crustacean, 

 I do not know of what it is made, or how, but it 

 seems to be homogeneous, and is certainly of home 

 manufacture, and not the tube of a zoophyte surrep- 

 titiously obtained, as has been supposed to be the 

 case with the Ceraims tuhularis of North America. 

 Perhaps, however, closer examination might refute 

 the charge of piracy brought against that species. 



Our little animal is somewhat longer than its tube, 

 or from -^2 to -j inch in length. It belongs to the 

 genus Cerajms as restricted, but appears to differ 

 from either of the species hitherto recognised as 

 British : I therefore propose to call it C. Whitei, after 

 my esteemed friend Mr. Adam White of the British 

 Museum. 



MEDUSiE. 



A single specimen occurred in my dip-net the other 

 day of a very tiny Medusa, which I cannot certainly 

 identify, and which I hardly know how to apportion 

 to its proper generic place. It has some resemblance 

 to the lovely little Modeeria/ormosa, but the number 

 and arrangement of its tentacles seem to point out 

 the OceaniadcE as its allies. I do not see the con- 

 spicuous muscular bands which would indicate it as a 

 Turris, and I shall therefore call it an Oceania. I 

 describe it in the following terms. (See Plate XIII, 



fig. 11). 



Oceania imsilla. Umbrella mitrate, constricted 



