1 64 THE GASTROPODA 



TRIBE 1. RACHIGLOSSA. 



These are Stenoglossa with a highly-developed proboscis, a pallial 

 siphon, and rudimentary jaws : the radular formula is 1.1.1 (Fig. 74, H). 

 FAMILY 1. TURBINELLIDAE, Sowerby. Shell solid, piriform, with a 

 thick folded columella ; foot broad ; proboscis long ; tentacles conver- 

 gent ; lateral teeth of the radula bicuspidate. Genera Turbinella, 

 Lamarck ; shell with short spire and long canal. Cynodonta, Schumacher ; 

 spire and canal short ; shell tuberculated. Fulgur, Montfort ; shell 

 piriform ; tentacles short. Hemifusus, Swainson ; shell fusiform with 

 carinated whorls ; tentacles short (Fig. 99). Tudicla, Link. Strepsidura, 

 Swainson. FAMILY 2. FASCIOLARIIDAE, Adams. Shell elongated, with 

 a long siphon ; head small and narrow, with short tenacles ; foot rather 

 broad and short ; lateral teeth of the radula multicuspidate. Genera 

 Fasciolaria, Lamarck. Fusus, Lamarck. Clavella, Swainson. Latirus, 

 Montfort FAMILY 3. MITRIDAE, Adams. Shell fusiform and solid, 

 the spire pointed, the aperture elongated and the columella folded ; no 

 operculum ; tentacles elongated, bearing the eyes at their sides ; foot 

 narrow ; proboscis very long ; siphon moderately long. Genera Mitra, 

 Lamarck. Turricula, Klein. Cylindromitra, Fischer. Imbricaria, 

 Schumacher. FAMILY 4. BUCCINIDAE, Fleming. Foot large and broad ; 

 eyes at the bases of the tenacles ; shell ovoid, with oval aperture ; a 

 horny operculum. Genera Chrysodomus, Swainson ; shell fusiform, 

 solid, with an unguiculate operculum ; British. Liomesus, Stimpson ; 

 shell ovoid, with a very short canal ; tentacles short ; lateral teeth of the 

 radula unicuspidate. Buccinum, Linnaeus ; shell ventricose with a wide 

 aperture ; operculum oval with sub-central nucleus ; tentacles moderately 

 long ; lateral teeth with three or four cusps ; British. Cominella, Gray ; 

 shell fusiform ; the operculum oval to piriform, with an apical nucleus. 

 Tritonidea, Swainson ; shell ventricose ; operculum like that of Cominella. 

 Pisania, Bivona ; shell with a short canal ; operculum unguiculate ; 

 lateral teeth tricuspidate. Euthrio. Gray ; shell fusiform, with elongate 

 spire and canal. Phos, Montfort ; foot broad with two lateral projections 

 anteriorly and a slender posterior filament. Dipsacus, Klein ; foot 

 elongated ; tentacles long ; shell ovoid, solid, with a short canal ; lateral 

 teeth bicuspidate. FAMILY 5. NASSIDAE, Swainson. Foot broad, with 

 two slender posterior appendages ; siphon long ; shell ovoid, with a short 

 canal ; operculum unguiculate. Genera Nassa, Lamarck external 

 border of the aperture of the shell thickened ; marine ; British. Canidia, 

 Adams ; exterior border of the aperture simple ; fluviatile. Bullia, 

 Gray ; shell polished ; tentacles without eyes ; foot very broad ; a 

 burrowing form. FAMILY 6. MURICIDAE, Fleming. Foot truncated 

 anteriorly ; tentacles elongated, bearing the eyes on their sides, more or 

 less high up ; shell with moderately long spire and canal, ornamented 

 with ribs, often spiny. Genera Murex, Linnaeus ; eyes half-way up the 

 tentacles ; canal almost closed ; British. Trophon, Montfort ; eyes at the 

 bases of the tentacles ; shell lamellar ; canal open ; British. Typl^is, 

 Montfort ; shell with closed canal and tubular spines. Urosalpinx, 

 Stimpson. Lachesis, Risso. FAMILY 7. PURPURIDAE, Broderip. Foot 



