36 INVERTEBKATE ANIMALS. 



Family MURICIDiE. Murex. 



Group 107.— Sub-family FUSING. fiisiis, a spindle. 

 Estimated number of species : recent, 206 ; British, 6 ; 

 fossil, 340. Oolite, &c. 



IT Examples of Fusus, Hemifusus, Pisania, 

 Neptunea Turtoni, &c. ; amongst them, Fusus 

 pagodus and Metula clathrata. 



Upper Compartment. 

 Fusus antiquus, fitted up as in Norway for use as a 

 lamp. 



Group 108.— Sub-family MURICIN^. Estimated number 

 of species : recent, 268 ; British, 6 ; fossil, 180. 

 chiefly Tertiary. 



U Examples of Murex, Trophon, &c., including a 

 very fine series of Typhis, S. Smith ; and 

 Murex endivia, Dennison collection. 

 M. brandaris and M. erinaceus were probably the 

 chief sources of the purple dye for which 

 ancient Tyre was celebrated. 



In the Molhiscs of the next Sub-class ocmr for the first time in the ascending 

 series animals which have attained to aerial respiration. As compared 

 with other Gasteropoda, the Land-snails and Slugs possess a similar 

 odontophore or elastic strap, set loith sharp teeth; transformations less 

 distinct ; a primary neural flexure of the intestine ; and breathe air by 

 means of a pulmonary chamber formed by an inflexion of the mantle. 



