300 TETJNCATELIiA. 



TEOCHUS. Linn. (A top.) Fam. Turbinacea, Lam. Groniosto- 

 mata, BL — Descr. Turbinated, tbick, striated, tuberculated 

 or smooth ; spire elevated, conical, consisting of numerous 

 wborls ; under surface discoid ; aperture more or less depressed 

 in an oblique direction, generally angular ; columella arcuated, 

 more or less prominent at its union with tbe outer lip, con- 

 tiguous to the axis of tbe shell ; operculum horny, orbicular, 

 with numerous whorls. — Obs. Lamarck distinguished this genus 

 from Turbo by the general form, which is more conical, and the 

 aperture, which is angulated, while that of Turbo is rounded. 

 Monodonta or Odontis is only separated on account of the notch 

 at the termination of the columella. But these characters glide 

 so imperceptibly from one genus to the other, that there is no 

 line of demarcation to be found but in the operculum. Accord- 

 ingly, Sowerby (in Gen, of Sh. 37.) has stated his reasons for 

 considering as Trochi, all the species which have horny opercula ; 

 and as Turbines, all those which have testaceous opercula. The 

 Trochi are found in all climates. PI. xvi. fig. 358 to 360. 



TEOPJ^^UM. Sow. Ceioceeatites. 



TEOPHON. Montfort, 1801. Mueex Magellanicus, Auct. 

 Pusus Antiquus, and several other species which belong more 

 properly to Pusus than to Murex. T. scalariformis, "Wood. 

 PI. xxviii. fig. 595. 



TETJMPET SHELL. A large species of Triton (variegatus), 

 used by the natives of South Sea Islands as a trumpet, to call 

 warriors and herds of cattle together. It answers the purpose 

 tolerably weU, producing a very sonorous blast. 



TEIJISrOATED. (truncus, cut short.) Terminating abruptly, as it 

 were cut short. Ex. Solenensis, fig. 60, 



TEUNCATULANA. D'Orb. A genus of microscopic Porami- 

 nifera, 



TEUNCATELLA. Eisso, 1813. A genus composed of several 

 species of land shells which have been confounded by some 

 authors with Cyclostoma. The genus is thus described : " Shell 

 turriculated, cylindrical, decollated or truncated at the apex, no 

 epidermis ; aperture oval, short, with lips continuous, simple." 



