46 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 16, 



differs from that species, however, in having a straight narrow aper- 

 ture, a flat wide outer hp, its inner edge being crenulated, its large, 

 coarse and distant columellar plaits, and in its general shape. 



VOLUTA PULCHELLA. Pl. IX. fig. 4. 



Testa oblongo-ovata, Isevis, longitudinaliter costata, anfractibus senis subrotunda- 

 tis, spira acuminata ; costellis plerumque antice subobsoletis ; labio externo in- 

 tus laevi, columella plicata, plicis anticis majoribus. 



There are apparently two varieties of this species, one of which is 

 smaller and rather wider ; its ribs are also rather fewer, and more 

 generally somewhat obsolete anteriorly. 



VoLUTA SOROR. 



Testa ovato-oblonga, laevigata, anfractu ultimo oblique longitudinaliter costato, 

 antice transversim striato ; margine interno labii externi denticulato, plicis labii 

 columellaris distantibus, posticis parvis. 



There is only a single individual of this species, which has lost its 

 spire ; it is distinguishable from V. pulchella by its greater size, and 

 by the obliquity of the longitudinal ribs. 



MiTRA Henikeri. Pl. IX. fig. 5. 



Testa oblongo-fusiformis, utrinque acuminata, anfractibus septem, spiraliter sulca- 

 tis, sulcis majoribus minoribusque alternantibus, ad basin decussatis ; margine 

 labii externi crenulato ; plicis columellaribus duabus posticis validis, antica soli- 

 taria obsoleta. 



This species is nearest in form to the recent M. filosa, which has 

 four plicse on the columella. 



MiTRA YARICOSA. 



Testa oblongo-subfusiformis, anfractibus subventricosis, liris majoribus minoribus- 

 que asperis alternantibus, varice aspera prope suturam distincta ; plicis colu- 

 mellaribus posticis duabus, validis, tertia obsoleta. 



Remarkable for its two prominent columellar plicae, and for the 

 spiral varix placed at the posterior part of the volutions near the su- 

 ture. A fragment only exists. 



Columbella Haitensis. 



Testa ovalis, anfractibus senis, spiraliter striatis, transversimque costellatis, an- 

 fractu ultimo ventricoso ; apertura latiuscula, canali brevi, reflexa, extus striata ; 

 sutura valida; columella postice rugulosa; labio externo intus dentibus qua- 

 tuor ad quinque induto. 



A very small species, not quite three-eighths of an inch in length, 

 and nearly one-eighth in width. 



Columbella venusta. Pl. IX. fig. 6. 



Testa oblongo-acuminata, crassa, anfractibus 9, subventricosis, longitudinaliter 

 costellatis, costellis flexuosis, transversim sulcatis, sulcis crebris, costellas decus- 



