239 



propriety, again separated them, and placed them under two distinct 

 genera, Balamus and Anatifa, agreeable to the differences which the form 

 and structure of their shells seem to point out. 



CLVII. Balanus. A conical multivalve, fixed by its base, and com- 

 posed of six articulated valves; the opening being closed by an oper- 

 culum, formed of four valves. 



The Balani are not to be considered among those fossils which are 

 frequently found. Bayer figures a Balanite found in the neighbourhood 

 of Nuremberg. In France, agreeable to D'Argenville, these fossils are 

 of rare occurrence ; nor do I believe they are frequently found in this 

 country. They are indeed sometimes found, very small, on the Har- 

 wich fossil-shells ; and I possess one of these, which is detached, and so 

 small as to be really a proper microscopic object. M. d'Aunone parti- 

 cularly speaks of some of these fossils found in the neighbourhood of 

 Basle, and Monti discovered them in the mountains near Bologna. Tar- 

 gioni also describes those of the hills of Pisa ; and M. Allione mentions 

 several specimens found in Piedmont. In the hills of Tuscany they are 

 also found, in very considerate numbers; and even the specimens 

 which are found there are said to contain more species than have yet 

 been observed in a recent state. It is worthy of remark, that many of 

 the Balanites which are found in the arenaceous and calcareous strata of 

 the Tuscan hills, still retain a considerable part of their colour. The 

 specimens which I possess, of this fossil, are from Tuscany, Piedmont, 

 and Maryland ; but none of them are in that state of preservation as will 

 allow of ascertaining precisely their specific characters. 



Lamarck appears to have very properly separated from the genus 

 Balanus those shells of which he has formed the two following genera, 

 and which are composed of the shells which, with their inhabitants, are 

 found deeply imbedded in the fat of whales. 



CLVIII. Tubicinella. A regular tubular, not spiral, univalve ; nar- 

 rowing towards the base, and truncated at each end. The terminal 

 opening circular, with a four-valved operculum. 



