BAELEEIA. 391 



Notwithstanding the proboscidal muzzle not being a strictly 

 retractile one, I think the balance of characters is in favour of 

 this animal being a transition-form from the Littorinidte, and 

 that it may be considered an aberrant Chemnitzia. 



I have stated above, that the pair of tentacula on each side 

 are not formed by a scission of any part of the rostrum. I 

 believe that I am in error, in consequence of the minuteness 

 and torpidity of my specimens. I think the /. globularis can 

 scarcely be considered even a variety of the " opalina." It 

 will not surprise me if the three so-called species, J. dia- 

 phana, J. opalina, and /. globularis, turn out to be identical, 

 differing only through climate and habitat, and exhibiting the 

 same phases as the variety of the Littorina rudis termed 

 " tenebrosa," in its minute globular variations, the " neg- 

 lecta " and "fabalis " of authors. A rigorous examination 

 of the peculiar internal aspect of the columella of the three 

 so-called species, and the absolutely identical form of the 

 operculum, even to the minutest portions of the sculpture, 

 which certainly would not be the case if they were distinct, 

 authorize me to express an opinion as decided as can be 

 accorded to a shell inquisition, that the three are identical, 

 and I cannot doubt that the animal of /. globularis will con- 

 firm this view. 



BARLEEIA, nobis. 



For many of the reasons stated in the introduction to the 

 Heterophrosynidce, and for those in the siibjoined account, we 

 have transferred the Rissoa rubra of authors to this family, as 

 a new additional genus. Though Barleeia, like Jeffrey sia, has 

 some Littorinidan attributes, we think that both these genera 

 differ sufficiently from that group to require being arranged in 

 a new family between the Littorinida and PyramMellida, with 

 both which the two genera have relations, as well as with 

 each other ; and as some difference of opinion has existed with 

 respect to the position of Jeffreysia, we have adopted for the 

 family the significant title of Heterophrosynidce. 



