OF CONCHOLOGY. 51 



On Oliva aurieularia, Lam., 0. aquatilis, Reeve, and 0. 

 auricidaria, D'Orb. By F. P. Marrat. 



The author endeavors to unravel the snarl into which these 

 species had become involved. He believes that the second is a 

 synonym of the first, and that D'Orbigny's species, being distinct, 

 not only from the true aurieularia with which it was confounded 

 by D'Orbigny, but also hombijAicata, Sowb., with which it has 

 been more recently confounded, should receive the name of its 

 discoverer, D' Orhignyi. Lamarck's species is African, the other 

 South American. 



No. 9, September, 1868. 



On a point relating to the Histology of Rhynchonella. By 

 Prof. W. King. 



On some new species of Oliva. By F. P. Marrat. 



0. Ugnaria, Borneo. 0. notata, Loc. — ? 



0. sabulosa, Loc. — ? 0. exilis, South America. 



0. angustata, China. 0. pulchra, Loc. — ? 



No. 10. October, 1868. 



On the typical value of the Lingual Dentition in the right 

 distribution of the genera of Crasteropoda into Natural 

 Groups and Families. By John D. Macdonald, M.D. 



This is an attempt to show that dentition is a sure guide in 

 classification, provided only those species are included, in families 

 where the type of dentition is identical — and that, per contra, the 

 discredit that has been cast on this method of classification origi 

 nated in the fact that Conchologists have persisted in grouping 

 together genera and species in which the dentition is totally dis- 

 tinct. Dr. Macdonald is right in both premises, but we think 

 that his paper will not answer the purpose for which it was de- 

 signed, for the lists of two families arranged by dentition will be 

 sufficient of themselves to demonstrate to all Conchologists the 

 impropriety of uniting in one family mollusca so very dissimilar, 

 merely because they are alike in one character. 



On the structure of the Shells of Brachiopoda. By. Dr. 

 Wm. B. Carpenter. 



Last Report on Dredging among the Shetland Islands. By 

 J. GwYN Jeffreys. 



This paper contains a valuable list of seventy-five species of 

 Mollusca, usually considered northern, which are common to the 

 North Sea and the Mediterranean, with their principal synonyms; 



