2 96 Shell Life 



color) attains the length of 1 inch. It is semi- 

 transparent, white or orange in colour with yellow 

 tips to the cerata, and the central tube violet fading 

 to orange-brown towards the base. It feeds upon 

 Ohelia. The Painted ^olis (G. jncta) has the several 

 rows of inflated cerata spotted with opaque white 

 and orange-brown, whilst the centre is pale buff. 

 Farran's ^Eolis {G. farrani) is pellucid white, the 

 tentacles and cerata tipped with orange. The Belted 

 ^olis (G. cingidata) is a very beautiful form less 

 than half an inch in length, wdiite blotched with 

 rich olive - brown. The cerata are set in eight or 

 nine distant rows, and have a pale ^^ellow centre 

 and three olive - brown belts. The tentacles are 

 banded by red or reddish brown, and behind them 

 is a patch of olive-brown. 



In the genus Gorypliella, of which we have six 

 species, the cerata are not arranged in rows but in 

 ill-defined clusters. 



The Red-gilled ^olis {G. Tiifihrancliialis) is about 

 1 inch long, very slender, and well covered with 

 slender cerata which are ringed with white near the 

 tip, and whose irregular central tube is scarlet or 

 rose coloured. The Slender ^olis (6'. gracilis) has 

 large and conspicuous eyes, the tips of the cerata 

 ringed or patched with opaque white and the centres 

 reddish yellow. In G. smaragdiiia these cerata 

 centres are emerald green ; in G. landshurgJiii they 

 are orange-red. This last-named species, which is, 

 apart from the cerata tubes, of a beautiful trans- 

 parent pale violet tint, is found on Hydroids in deep 

 water. 



Tlie White ^olis (Favorinus alhiis) is nearly half 



