434 



THE OCEAN WOKLD. 



spire more or less elevated, its surface generally covered with rows 

 of spines, or tubercular ramifications. The opening, which is oval, is 



Fig. 283. Uarpa imperialis (Lamarck). 



Fig. 284. Harpa articularis 

 (Lamarck). 



prolonged in a straight canal, often of very considerable length, as 

 in Fig. 286 (Murex haustelhim) ; the external edge is often smooth 

 or rippled, the columellar edge sometimes callous. 



The head of the 

 animal is furnished 

 with two horns or 

 tentacles, ocular upon 

 their external side, the 

 mouth elongated in 

 the form of a trunk. 

 The foot is large and 

 round, and furnished 

 with a horny oper- 

 culum. 



Among the species 

 with long slender tube, 

 covered with spines, 

 one of the most notable 

 is Murex tenuispina 



Fig. 235. Murex temiispina (Lamarck). 



Ocean and the Moluccas. 



Fig. 286. Murex haustel- 

 lum (Linnzeus). 



(Fig. 285), which is a 

 native of the Indian 



