FAMILY 8. CANALIFERA. 19] 
Pl. CCXXXVI. Fig. 4. 
PyrULA PAPYRACEA, Lamarck, Anim. sans vert., vol. vii. p.144. Martini, 
Conch., vol. ili. pl. 68. f. 747 to 749. Encyclopédie Méthodique, 
pls. £.13:0,;03,: 
Rapa alba, Seba. 
Rapa amethystina, Argenville. 
Bulla rapa, Linneeus. 
Murex rapa, Gmelin. 
Pl. CCXXXVI. Fig. 5. 
PyruLA PERVERSA, Lamarck, Anim. sans vert., vol. vii. p. 158. Ency- 
clopédie Méthodique, pl. 433. f. 4. a, b. 
Murex perversus, Linneus. 
MUREX, Linneus. 
Testa ovata, vel oblonga, spira szpissimé prominula, apice subacuto ; 
anfractibus leviter convexis, superficie varicibus plurimis, aut ra- 
mosis, aut spinosis, plus minusve ornata; varice ultimo aperture 
marginem aut labrum formante, dente unico prominulo nonnun- 
quam instructo ; apertura suborbiculari ; columella levi, arcuata, in 
canalem nunc longissimum, tubulosum, nunc breviusculum, recur- 
vum, desinente. Operculum parvum, corneum. 
In the early ages of Greece, it was customary for the Knpvg or com- 
mon crier to introduce himself to the notice of the people by lustily 
blowing through a shell. We learn from tradition, as well as history, 
that the Triton tuba or Trumpet-Shell (Murex Tritonis, Linnzeus) was the 
one commonly selected for that purpose; but it is more than probable 
that the shells of many other Canalifera were used. Be that as it may, 
it is certain that the word Keriz was applied by Aristotle from that cir- 
cumstance to all the canaliculated shells with which he was acquainted, 
