567 



angusta, lineari, inferne valde dilatata ; plica ad basin columella? 

 vix distincta. 



Shell minute, cylindrical, longitudinally substriated ; apex 

 truncated, papillary in the middle ; spire conspicuous, truncated, 

 whorls three, the first of which consists of an elevated papilla ; 

 aperture narrow and linear above, dilated below ; columella with 

 an indistinct plait at the base. 



Sicily. Exmouth, England. Mus. Cuming. 



14. Bulla truncata (pi. cxxi. f. 27), Adams, Linn. Trans, 

 v. i. Montag. t. vii. f. 5. B. semisulcata, PhiUppi. 



B. testa minuta, cylindrical, basi vix dilatata, superne longi- 

 tudinaliter sulcata, sulcis inferne evanidis ; vertice truncato, 

 concavo ; spira manifesta, anfractibus 3-4 ; apertura anguste 

 lineari, inferne dilatata ; plica ad basin columellas parum manifesta. 



Shell minute, cylindrical, a little dilated at the base, above 

 longitudinally grooved, grooves obsolete below ; apex truncated, 

 concave ; spire visible, whorls 3-4 ; aperture narrowly linear, 

 dilated inferiorly ; a faint indication of a plait at the base of the 

 columella. 



Frequent in Sicily. British Islands. Mus. Cuming. 



15. Bulla turrita (pi. cxxi. f. 28), Moll., Ind. Moll. 

 Greenland., p. 79. 



B. testa minuta, cylindrica, alba ; spira producta ; apice acuto ; 

 rima umbilical! angusta ; anfractibus 3^, long. 1*5. 



Shell minute, cylindrical, white ; spire produced ; apex acute ; 

 umbilical fissure narrow; whorls 3-§-, length l - 5. 



Greenland. Mus. Brit. 



16. Bulla obstricta (pi. cxxi. f. 29), Gould, Silhman's 

 Journ. xxxviii. 196. 



B. testa ovato-cylindrica, alba, sublsevi, longitudinaliter sulcata ; 

 spira subelevata, anfractibus quatuor, anfractu ultimo in medio 

 obstricto ; columella uniplicata ; apertura angusta, lineari, in 

 medio coarctata, inferne dilatata. 



Shell ovately cylindrical, white, rather smooth, longitudinally 

 grooved ; spire somewhat elevated, whorls four, the last whorl 

 contracted in the middle ; columella with a single plait ; aperture 

 narrow, linear, contracted in the middle, dilated inferiorly. 



United States : Massachusetts. 



