UNIVALVES. 



TROCHUS, 



HI 



Amongst the fossil species, there are two with the 

 \^horls contrary, viz. Trochus ferrugineus, and Trochus 

 novus: the former ofwhich is found near Staphusia, con- 

 verted into iron-ore. The Trochus Schrceteri is also 

 found fossil in Campania. 



The following are the places which yield specimens of 

 the Trochi, viz. Asia, Africa, America, Friendly Isles, 

 New Zealand, Red Sea, Mediterranean, the European 

 and British seas, &c. &c. &c. 



TROCHUS.— Toi? Shell. 



A. Erectf with the pillar perforated. 

 Niloticus(3/«riZ«Z7Voc7t?i5.)Jujubinus. 

 Maculatus(,S'/>o<<e(Z T^roc/itw) Alveare {Bee-hive.) 



