CLASSIFICATION. 



SYNOPSIS OF THE GENERA IN NATURAL POSITION. 



Patella. 



Acmaea. 



Pileopsis. 



Calyptraea. 



Fissurella. 



Emarginula. 



Puncturella. 



Haliotis. 



Pleurobranchus . 



Aplysia. 



Bulla. 



Bullsea. 



Otina ? 



Limnea, &c. 



Limax, &c. 



Helix, &c, 



Conovulus. 



Pedipes. 



Carychium. 



Spirialis. 



Trochus. 



Phasianella. 



Scissurella. 



Valvata. 



Caecum. 



Turritella. 



Cyclostoma. 



Paludina. 



Neritina. 



Littorina. 



Assiminia. 



Rissoa. 



Truncatella. 



Acme. 



Tornatella. 



Jeffreysia. 



Barleeia. 



Chemnitzia. 



Eulima. 



Aclis. 



Stylifer. 



Scalaria. 



lanthina. 



Natica. 



Lamellaria. 



Velutina. 



Rostellaria. 



Murex. 



Cypraea. 



Ovula. 



Marginella. 



Octopus. 



Eledona. 



Loligo. 



Sepia. 



Sepiola. 



Spirilla. 



If these positions are correct aud we have endeavoured to 

 test them by the examination of near three hundred animals, 

 all of which are confirmatory we shall have placed the whole 

 division of the Testaceous Mollusca on the sound "basis of 

 natural position. It is scarcely necessary to remark, that the 

 subarraugement of the families, genera, and species, in their 

 respective divisions, is of minor moment, and may almost be 

 committed to the ad libitum of the naturalist ; all that is 

 necessary is, to collect similar objects, and deposit them, with- 



