18 



sutura distincta : aperturS. ovala, posticfe subsinuata, antice 



dilatata; long. 2'55, lat. 0-95, poll. 



My specimens of the recent species were received lately from Ma- 

 nilla. The fossil is found abundantly in a bed of marie, intermingled 

 with Cyrense and fragments of shells, above a thick bed of white sand, 

 between Charlton and Woolwich, in Kent ; also in several other parts 

 of England ; and in several localities in France. The best representa- 

 tions of the fossil are those given in Mineral Conchology. 1. c. I have 

 never seen a single specimen of the fossil with the outer lip complete: 

 but it is easy to trace the form of it by the lines of growth, which are 

 sometimes very strongly marked. In order that this subject may be as 

 fully illustrated as possible I have added a correct representation of each 

 of the varieties of each species. 



Naturalists will now be able to form their own opinions as to the 

 identity or non-identiiy of these recent and fossil shells. 



References to Plate I. 



Fig. ], 2, 3. Tubercular varieties of Melania Philippinarum nobis. 

 a. a. the space between the posterior tubercular ridge and the 

 suture. 

 4. Variety of Melania Philippinarum nobis, without a tubercular 

 ridge. 

 a. a. The space between the posterior ridge that is usually 



tuberculated and the suture. 

 h. b. Distinct lines of growth showing the form of the outer 

 hp. 



5. Melania inquinata, Defr. 



a, a. The space between the posterior tubercular ridge and the 

 suture. 



6. Melania inquinata, Defr., a specimen showing the manner 



in which the tubercles of the posterior ridge are com- 

 monly eroded. 

 a. a. The space between the posterior tubercular ridge and the 

 suture. 



