74 



UNIVALVE SHELLS. 



NAUTILUS. 



Beccarii. Nautilus Beccarii, Lin. Trans, viii. p. 1 \G. 



p. 186. Pult. Hutch. Dorset, t. 59, f. 28. 



Tab. 18. f.4. 



This and the Beccarii perverfuSy are not uncommon in a 

 fodil Hate ; Mr. Mead favoured us with fpecimens which 

 he colledled from the Appenines, near Sienna, in Italy. Thefe 

 are crowded in a yellowifh earthy matrix, mixed witli J\^aii- 

 tiliis Crifpus, and another very jninute nondefcript fpecies 

 rarely, and lefs frequently Serpula lobata. 



Both the Beccarii are about double the fize of the recent 

 fhelis found on our fliores, the efFedt of a warmer climate. 

 Plancus noted thefe amongfl other minute fpecies in the 

 fands on the fhore of Areminum, now Rimini, in the Adriatic. 



The opening or entrance of the fyphon in thefe fliells, is 

 fituated at the interior fide clofe to the fecond whirl, and is 

 continued throughout all the numerousy^/)^a without a break. 

 An examination of the ftru6lure is more eafily and accurately 

 obtained by thefe antideluvian reli61s than by recent fliells, 

 as they bear grinding much better. 



The 



