147 



MONOGRAPH OF THE GENUS 

 TEREBRA; Bruguiere. 



BY 



RICHARD BRINSLEY HINDS, ESQ. 



Testa subulata, acuminata, subturrita. Anfractus nume- 

 rosi, rarius numerosissimi, rarissime perpauci, planulati ; 

 ultimus brevis, contractus. Apertura ovalis, interdum sub- 

 quadratus. Columella nuda vel callo induta ; recta, obliqua, 

 vel contorta. Canalis subnullus vel paulo productus ; rectus 

 vel subrecurvus. Operculum corneum, lamellosum, ungui- 

 forme. 



Testa elongata, turrita, apice peracuta. Apertura longitudi- 

 nalis. Spira duplo vel ultra brevior, basi postice emarginata. 

 Columellae basis contorta vel obliqua. Lamarck. 



Testa elongata, subulata, anfractibus numerosis, gradatim majo- 

 ribus, apertura brevi, oblonga, in canalem brevem, rectam desi- 

 nente; columella contorta, spirali : operculo corneo, non spirali. 

 Sowerby, Genera. 



Testa elongata, turrita, apice peracuta. Apertura longitudi- 

 nals ; spira duplo vel ultra brevior, basi postice emarginata. 

 Columellae basis contorta vel obliqua. Operculum ovatum, cor- 

 neum, lamellosum, imbricatum. Kiener. 



The animal is remarkable for its small size compared with 

 that of the shell, and alsofor theminuteness ofitsorgans. That 

 of Terebra dimidiata, is described by MM, Quoyet Gaimard; — 

 head large. Tentacles distant, very small and short. Eyes 

 scarcely visible, situate about the middle of the length of the 

 tentacles. Foot elongated, somewhat cylindrical, grooved. 

 Between the tentacles is a thick cylindrical trunk, capable of 

 dilating itself, and forming a cavity. Stomach elongated, 

 slightly dilated. Salivary glands surrounding the oesophagus, 

 vermicular, united into a mass. Biliary organ and testacle 

 occupy nearly the whole of the spire. Heart apparently very 

 elongated. Follicles situate in the folds of the margin of the 

 mantle, and secrete, more or less abundantly, a mucous fluid. 



B 



