CONCHOLOGY. 



wliicli has not that peculiarity, and that is the Turbo Clathraius, 

 Nothing, however, can be more certain than that from this very cir- 

 cumstance these two shells are generically distinct from each other ; 

 Clathratus may be retained with the Linnsean Turbines, but Scalaris 

 has nearly, if not entirely as much claim to the Serpula"^' as Turbo 

 genus ; which cannot be said of T. Clathratus. We shall for this 

 reason allow the W entletrap to remain where Linnseus has placed it, 

 namely, among the Turbines ; not perhaps without some hesitation, 

 but if we did remove it, we should certainly prefer the institution of 

 new genus for its reception, instead of wandering from one anomaly 

 to another, as we must perceive would be the case in the present 

 instance by following the example of Lamarck and Cuvier. 



It may be lastly observed that the progressive growth of this 

 extraordinary rarity may be determined by the greater number of the 

 longitudinal ribs that pass over and surround the tube of the whorls, 

 for at each increase the animal forms a new mouth to its shell : the 

 new mouth as it is protruded and formed, appears like the former 

 ones, entirely surrounded by a rim or ring, and it is these rings of 



* Serpula Linn. Vermicular us De Montf. Vermet Adanson. The animal 

 of the Serpula?, it may be added further, does not differ, according to Cuvier, 

 from those of the Linnaean Genus Turbo, and consequently not from Scalaria 

 of Lamarck and Cuvier, as must be concluded from their admission of Turbo 

 Clathratus among the number of its species, in an arrangement founded on 

 the organization of the animal, as well as its testaceous habitation. Cuvier 

 himself observes that the animal of the Vermet, and also the opening (of the 

 shell) resemble those of the Turbo, but that the whorls do not touch, and are 

 in part irregularly curved like the tubes of the Scrpulas. — Regne Animal 

 T. 2. 419. And his classification further shews the analogy of these tribes 

 of shells, since the animal of the Linnican Turbo, the VenncU of Adanson, 

 and Scalaria of Lamarck, are all of the same family, the Gasteropodas Pecli- 

 nibranches of Cuvier. 



