50 



sutura impressa ; columella callosa. Height, .5 inch ; greatest 

 basal diameter, .43 inch. Habitat, Casco Bay. 



Cingula latior, Migh. C. testa minima, ovato-conica, laevi, 

 pallida ; anfractibus quatuor, convexis ; sutura impressa ; spira 

 quam apertura longiore ; anfractu postremo magno ; apertura sub- 

 ovata ; operculo corneo. Length, .08 inch ; breadth, .05 inch. 

 Habitat, Casco Bay. 



Turritella costulata, Migh. T. testa albida, transverse subti- 

 lissime striata ; anfractibus decern, superioribus sub-plicatis, duobus 

 ultimis sub-leevibus, ultimo sub-carinato ; apertura subovata, ante- 

 rius products.. Length, .7 inch ; breadth, .23 inch. Habitat, 

 Casco Bay. 



Turritella reticulata, Migh. T. testa turrito-subulata ; anfrac- 

 tibus duodecim, convexis, longitudinaliter plicatis, transversim stri- 

 atis ; sutura valde impressa ; apertura sub-orbiculari. Length, 

 .7 inch ; breadth, .2 inch. Habitat, Bay Chaleur. 



Pleurotoma violacea, Migh. & Adams. P. testa atro-purpurea, 

 longitudinaliter sub-plicata, transverse striata ; anfractibus sex, 

 ultimo supra, carinato, plicis in medio evanescentibus, alteris medio 

 carinatis ; spira. acuta ; apertura angustata ; cauda brevi. Length, 

 .3 inch ; breadth, .15 inch. Habitat, Casco Bay. 



Fasciolaria ligata, Migh. F. testa elongata, fusiformi, crassa, 

 rubro-fusca, transversim costulata ; anfractibus sex, convexis : spira 

 acuminata ; sutura valde impressa ; apertura ovato-elongata ; labro 

 crenato ; columella biplicata. Length, .7 inch ; breadth, .3 inch. 

 Habitat, Mingan, in the Gulf of St. Lawrence. 



Fusus cancellatus, Migh. F. testa subulata, longitudinaliter 

 plicata, transverse striata : anfractibus septem, convexis : sutura 

 valde impressa ; spira acuminata ; apice acuta ; apertura sub-ovata ; 

 labro crenato. Length, .65 inch ; breadth, .25 inch. Habitat, Casco 

 Bay. 



Nucula antiqua, Migh. N. testa parva, sub-trapcziformi, per- 

 obliqua, transverse sulcata : dentibus posticis sexdecim, anticis sex ; 

 marginesimplici. Length, .7 inch ; height, .27 inch ; breadth, .2 inch. 

 Habitat, Westbrook, Me. (fossil.) 



Bulla occulta, Migh. B. testa parva, ovato-cylindracea : spira 

 occulta : labro supra elevato, medio recto ; apertura sub-angusta, 

 infra, lata, rotundati. Length, .2 inch ; breadth, .15 inch. Habitat, 

 Westbrook, Me. (fossil.) 



