797 



SIPHONOSTOMATA. 



SIPHONOSTOMATA. 



799 



Tw-bindla, (Lam.). Shell ordinarily turbinated, but also sometimes 

 turriculated, rugous, thick ; spire rather variable in form ; aperture 

 elongated, terminated by a straight canal, often sufficiently short ; the 

 left lip nearly straight, and formed by a callosity hiding the columella, 

 which has two or three unequal, nearly transverse plaits ; right lip 

 entire and trenchant. 



A. Fusiform and nearly smooth species. 



T. Rapa. Shell subfusiform, ventrioose in the middle, thick, very 

 ponderous, unarmed, white ; the whorls above covering the base of 

 the preceding one ; canal rather short ; columella subquadriplicated. 

 It is found in the East Indian Ocean. 



Turtiinella Rapa. 



B. Turbinaeeous and spiny species. 



T. Scolymisa. Shell subfusiform, ventricose in the middle, tuber- 

 culated, pale yellow ; spire conical, tuberculato-nodose ; the last whorl 

 crowned above with great tubercles ; canal transversely sulcated ; the 

 columella orange-coloured and three-plaited. It is a native of the 

 East Indian Ocean. 



C. Turriculated, subfusiform species. 



T. Infundibulum. Shell fusiform-turreted, narrow, many-ribbed, 

 transversely sulcated, the ribs longitudinal and thick, the furrows 

 smooth and red, and the interstices yellow; canal perforated, the 

 aperture white. 



Turbinettte have been found on bottoms of sandy mud, at depths 

 varying from the surface to 1 8 fathoms. 



There are 70 recent species, chiefly tropical, and 20 fossil, from the 

 Miocene Tertiary beds. 



** A persistent bourrelet on the right lip. 



Columlella (Lam.). Shell thick, turbinated, with a short obtuse 

 spire ; aperture narrow, elongated, terminated by a very short canal 

 slightly notched, narrowed by a convexity at the internal side of the 

 right lip and the plaits of the columella. Operculum horny, very 

 small. 



C. mercatoria. Shell ovate-turbinated, transversely sulcated, white, 

 painted with small, rufo-fuscous, transverse, subfasciculated lines, 

 sometimes banded; outer lip denticulated within. Found in the 

 Atlantic Ocean. 



Columbella mercatoria. 



Columbelkc have been found on bottoms of sandy mud and mud 

 at depths ranging from the surface to 16 $ithoms. 



The recent species are very numerous ; they are chiefly subtropical : 

 200 specie* have been described. They are small prettily-marked 

 shells, living in shallow water on sandy flats, or congregating about 

 tones. 



Triton (Lam.). Animal a good deal resembling that of Murex. 

 Shell oval, with the spire and canal straight and moderate ; ordi- 

 narily rugose, furnished with few varices, which are scattered and 

 arranged longitudinally; aperture suboval, elongated, terminated by 

 a short open.canal ; the columellar lip less excavated than the right, and 

 covered by a callosity. Operculum horny and inclined to oval. 



A. Comparatively smooth species, with cordons slightly or not at all 



marked, with the exception of that of the right lip. 

 T. variegattu, the Marine Trumpet, or Triton's Shell. Shell elon- 

 gated-conical, trumpet-shaped, ventricose below, girt with very obtuse 

 smooth ribs, white, elegantly variegated with red and bay; the sutures 

 crisped -it the margin ; the aperture red ; the columella wrinkled with 

 white and with a single plait above ; the edge of the outer lip spotted 

 with black, the spots bidentated with white. It is a native of the 

 seas of the West Indies and the Asiatic seas, especially those of the 

 torrid zone. 



Marine Trumpet or Triton's Shell (Triton varicffattts). 



B. Species more tuberculous, or spiny, whose aperture is more open> 



and terminated by a more or less ascending canal. (Genus 



Lotorium of De Montfort.) 



T. Lutorium. Shell fusiform-turreted, distorted below, very much 

 tuberculated, transversely rugous, and striated, rufous; the whorls 

 above angulate-tuberculated ; canal tortuous, the extremity recurved 

 the aperture trigono-elongated and white ; the outer lip toothed within . 

 It is a native of the East Indian Ocean. 



C. Species with a shorter spire, always very tuberculous, most fre- 



frequently umbilicated, a sinus at the posterior junction of the 



two lips. (Genus AquiUus, De Montfort.) 



T. cutaceus. Shell ovate, ventricose-depressed, cingulated, tuber- 

 culato-nodose, yellow-rufesccnt ; the belts rather prominent, separated 

 by a furrow ; the whorls above augulato-tuberculate, rather flattened 

 above ; canal short, umbilicated ; the outer lip notched within. It is 

 found in the Atlantic Ocean. 



D. Species like those of section C, but whose aperture is closely 



narrowed by a callosity and irregular teeth. (Genus Persona, 

 De Montfort.) 



T. Anus, the Grimace. Shell ovate, ventricose-gibbous, distorted, 

 flattened beneath ; nodulous above, subcancellated, white, spotted with 

 rufous; the aperture narrowed, sinuous, irregular, ringent; the lip 

 very much toothed ; the canal short and recurved. It is found in the 

 East Indian seas. 



Tritons have been found on various bottoms at depths ranging from 

 the surface to 30 fathoms. 



