AND OTHER FAMILIES. 225 



lieved that these were " conch shells," consequently coming from the 

 sea, it was urged that the inhabitants who possessed them must have 

 come over the sea. It does not appear that they had been observed 

 in their native element, though living at the very doors of the persons 

 who had remarked them in the tumuli. 



Paludina Burroughiana. Plate XIX. fig. 80. 



Testa turritd, tenebroso-corned, ty'ansversim striata, striis majoribus duabus 

 vel tribus circiter medium anfractum ; suturis pro/undis ; anfractibus senis, valde 

 convexis ; apertura rotundatd, albd. 



Shell turrited, dark horn colour, transversely striated, having two or three lara;e 

 striae about the middle of the whorl ; sutures very deep ; whorls six, very convex : 

 mouth round, white. 



Hab. Island of Luconia. Dr Burrough. 



My Cabinet. 



Cabinet of Dr Burrough. 



Cabinet of the Academy of Natural Sciences of Philadelphia. 



Diam. 1-2, Length 1-8 inches. 



Operculum thin, light brown. 



Remarks. — This is perhaps the largest species of Paludina which 

 has yet been observed. It is remarkable for the numerous fine trans- 

 verse strife which are subgranose or undulated, and which cover, in some 

 specimens, the whole of the whorls. About the middle of the whorls 

 there are several larger striae, the largest being always, in the specimens 

 examined by me, immediately above the suture. I owe to Dr Bur- 

 rough's great kindness the opportunity of describing this species. 

 During his late voyage he procured it, with many other fine shells, 

 from the vicinity of Manilla, in the island of Luconia. 



59 



