PULMONARY GASTEROPODS. 



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sea, especially those of Europe. The animal has a small flat head, 

 furnished with lateral tentacles or horns, bearing the eyes upon an 



Fig. 279. Purpura consul. 



Fig. 280. Buccinum 

 senticosum (Linnaeus). 



Fig. 281. Buccinum undatum 

 (Linneeus). 



external swelling, situated near their central length. We need only 

 refer to Fig. 280, Buccinum senticosum, and Buccinum undatum 

 (Fig. 281), for their general form, the well-known whelk of our 

 markets. 



The Harpas are shells of the Indian 

 Ocean, richly enamelled within, and orna- 

 mented externally with slightly oblique 

 longitudinal stripes in gay colours, with 

 finely-sculptured forms in the intervals ; 

 spiral very small, and opening large. 

 Among the more attractive species are 

 Harpa ventricosa (Fig. 282), Harpa 

 imperialis (Fig. 283), and Harpa artieu- 

 laris (Fig. 284). 



The fifth family, Murieidse, contains 

 Fusus, Pijrula, Triton, and Murex. 



The Murex, or Rock Shells, include a 

 large number of species, all remarkable 

 for their bright colours and somewhat fantastical and varied forms. 

 They are found in all seas, but become larger and more branching in 

 the seas of warm regions. The shell is oval, or rather oblong, the 



2 r 



Fig. 282. Harpa ventricosa (Lamarck). 



