^o 



THE MUSEUM. 



external edge is often smooth or rip- 

 pled, the columellat edge sometimes 

 callous. 



Fig. 33. 



The head of the animal is furnished 

 with two horns or tentacles, with ocelli 

 upon the external side, the mouth elon- 

 gated in the form of a proboscis. The 

 foot is large, round, and furnished with 

 horny operculum. 



Among the species with long slender 

 tube, covered with spines, one of the 

 most notable is Murex tenuispina [Fig. 

 3 5] which is a native of the Indian 

 Ocean and the Moluccas. 



Fi^. 34 



Among the strong-tubed species 

 with long canal and no spines, from 

 the same regions is Mure.x haustellum 



[Fig. 36], 



Among the short-tubed species, fur- 

 nished with foliaceous and jagged 

 fringes, is Murex Scorpio [Fig. 37]- 



One more typical species may be 

 noted namely Murex erinaceus [Fig 38] 

 which is found on all the coasts of Eu- 



Fig. 3.5. 



rope, and especially in the British 

 Channel. Other species worthy of 

 notice are found in the Mediterranean 

 and Adriatic, some of them, according 

 to Cuvier and de Blainville, species 

 which furnished the true Tyiian purple 

 of the ancients; but our space prevents 

 us from dwelling on them. 



Fig. 



The genus triton is ranged beside 

 the ^enus Murex in this system. The 

 shell irregularly covered with scattered 

 swelling excrescences, not as in Murex, 

 in longitudinal rows, but scattered all 

 over the surface. About 100 species 

 of Triton are known. They inhabit 

 many seas but more especially those 

 of warm countries. Triton tritornis. 





