NON-PULMONARY GASTEROPODS. 429 
Tlie Buccinums resemble the Purpura in many respects. Their 
s ^ le U is oval or conical, much notched in front. They inhabit every 
27o. Purpura consul (Linnaeus). 
Fig. 271. Bucciniim 
senticosum (LinntBus). 
Fig. 272. Buccinum undatum 
(Linmeus). 
Sea . especially those of Europe. The animal has a small flat head, 
* Ur Qished with lateral tentacles or horns, bearing the eyes upon an 
'"Eternal swelling, * situated near their 
Central length. We need only refer to 
271, Buccinum senticosum, and 
u ccinum undatum (Eig. 272), for their 
general form, the well-known whelk of 
° l, r markets. 
The llarpas are shells of the Indian 
c ean, richly enamelled within, and orna- 
j'lftjited externally with slightly oblique 
° n gitudinal stripes in gay colours, with 
Uf % sculptured forms in the intervals ; 
pRal very small, and opening large. 
, ll °Pg the more attractive species are „ „ 
jT n . ° x Fig. 273. Harpa ventricosa (Lamarck). 
. r pci ventricosa (Fig- 2/3), liarpa 
i,n Perialis (Fig. 274), and Harpa articularis (Fig. 275). 
The Murex, or Bock Shells, include a large number of species, all 
l(,|| iarkable for their bright colours and somewhat fantastical and 
^ried for mg . They are found in all seas, but become larger and more 
inching in the seas of warm regions. The shell is oval, or rather 
