288 GASTEEOPODES. 



different specimens is very great, and the contrasting colours very orna- 

 mental. It is neither rare, nor of difficult preservation. 



PLATE XLI. 



FIG. 6. Tritonia punctata, enlarged: back. 



7. Another specimen : belly, enlarged. 



8. Spawn, enlarged. 



The valuable work of Messrs Alder and Hancock contains a magnified 

 view, and some account, of an animal bearing considerable resemblance to 

 this species, under the name of Doto coronata, Family 3, Plate 6. But I 

 scarcely think the two are to be identified as the same. 



3. TKITONIA DIVARICATA. Plate XLI. Figs. 9, 10, 11. 



Length four lines, breadth under one ; two black specks between the 

 sockets of the tentacula. Two pair of branchiae rise from the back, each 

 consisting of two or three stages of short obtuse cylinders, spreading 

 around a central one, which is considerably larger. Colour very pale 

 watery blue, with short irregular brown streaks. The tentacula extend 

 far from the socket. 



The adhesion of the animal is tenacious. 



Only a single specimen has occurred. 



This, when taken in October, was mutilated of two of the tufts. 

 Regeneration appeared in a week ; and it had advanced far in some 

 weeks, during which the animal survived. 



PLATE XLI. 



Fio. 9. Tritonia divaricata, enlarged : back. 



10. Belly. 



1 1, Tuft, enlarged. 



