520 Qiiarteiiy Journal of Conchology. 



have been referred to Rhytida, i to Laoma, and i to Dorcasia. 

 The most interesting feature in the fauna is perhaps the presence 

 of 2 species ai Placostyhis, of the typical New Caledonian section. 

 There is also i Balece. 1 he operculates are very few, Diplomma- 

 thia I, Realia 6, and Cyclophoriis 2. 



F. Auckland Islands possess only Vitrina i and Thalaisia 2. 



We have now concluded our survey of the geographical 

 distribution of the Mollusca of the Old World, and pause for the 

 moment. Should this effort be favorably received, it is our 

 intention, after a short delay, to complete our task by a similar 

 sketch of the general features of American Molluscan life. We 

 are aware that there must be mmy deficien ces and errors in any 

 such attempt, and shall always feel grateful for any information 

 that may enable us to issue supplementary notes making good such 

 deficiencies or correcting such errors. We will only add, in 

 concluding this first part, that we have intentionally limited it to 

 that portion of the extra-marine mollusca to which we have more 

 specially attended ; and we are quite conscious that, to complete 

 the subject, the naked molluscs and the fresh-water species should 

 likewise be included. The latter we may undertake some time ; as 

 to the slugs we confess we share in Dr. Jeffreys' aversion for them. 



Note. — It may be proper to add, that the portion of this 

 paper referring to the Palsearctic Province was written before the 

 publication of Dr. Kobelt's second supplement to his catalogue. 

 Fully recognizing the importance of the views he has therein 

 expressed, we have thought that it would be more satisfactory to 

 both for our paper to be published as it was originally written, and 

 we have consequently made no alteration in it. 



