5 56 



MOLLUSCA 



PHYLUM VI 



Family 1. Oolumbellidae Troscliel. 



Shell small, ovate to fusiform, covered with epidermis, imj^crforate. Aperture narrou\ 

 .canal short. Outer lip denticulated internally, thickened in the middle. 

 Tertiary and Eecent. 



The typical genus, Golumhella Lamarck (Fig. 1010), attains its 

 maximum distribution in the Tertiary and Eecent seas. It is divided 

 into a number of subgenera. 



Fig. 1010. 



Family 2. Buccinidae Troschel. 



Columhella curta 

 Duj. Miocene ; 

 Lapugy, Transyl- 

 vania. 



wide, ivith 

 Cretaceous 



Buccinum 



high 



Shell elongate -oval, covered ivith epidermis. Aperture 

 short canal. Outer lip sharp or thickened. Operculum horny. 

 to Recent. 



Linn. Inflated, smooth or transversely ribbed. Spire moderately 

 aperture wide ; canal short, wide, open. Outer lip sharp and thin, inner lip 

 somewhat callous. Distributed principally in waters of the more 

 northerly zones (B. imdatum Linn.). Fossil in the Crag and 

 Pleistocene. 



Oominella Gray (Fig. 1011). Usually spirally ribbed. The last 

 whorl somewhat depressed beneath the suture, so that the aperture 

 forms a small groove posteriorly. Outer lip sharp or crenate inter- 

 nally. Upper Cretaceous to Eecent. 



Pseudoliva Swains. (Fig. 1012). Like the last, but outer lip 

 with a small basal tooth or notch which 



Fig. 1011. 



corresj^onds to a groove on the body whorl. 

 UjJiier Cretaceous to Recent. 



Pisania Bivona (Pisanella v. 



Cominella cassidaria 

 A. Braun. Oligocene; 

 Hackenlieim, near 

 Alzey. 



Koenen ; 

 Taurinia Bellardi). Elon- 

 gate-ovoid, sjjire moder- 

 ately high. Whorls 

 smooth or spirally 

 striated. Outer margin 

 thickened, notched inter- 

 nally. Tertiary and Re- 

 cent. 



Cantharus Bolten 

 (Pollia Gray ; Tritonidea 

 Swains.) (Fig. 1013). 

 Oval, inflated ; spire and 

 aperture of about equal 

 length ; surface usually 



spirally ribbed and transversely folded. Columella often with weak transverse folds ; 



outer margin thickened, crenate internally. Aperture posteriorly with a short canal. 



Tertiary and Recent. 



Phos Montf. Shell elongate, bucciniform, turriculate ; spire sharp, elevated, 



whorls ornamented with prominent longitudinal costae, and less salient spiral threads 



and sulci, often varicose. Aperture oblong ; outer margin lirate within. Columella 



excavated, plicate in front ; canal short, slightly twisted. Tertiary and Recent. 



Eburna Lam. {Dipsaccus Klein) (Fig. 1014). Resembling Nassa, but smooth, 



perforate, and with deeply incised sutures ; outer margin sharp. Tertiary and Recent. 

 Nassa Lam. {Alectrion Montf.) (Fig. 1015). Ovate, inflated. Aperture with short, 



reverted canal ; inner lip callous, expanded ; outer margin usually crenate internally. 



Fig. 1012. 



Pseudoliva zitteli 

 Upper Cretaceous ; 

 Gora, Hungary. 



Petlii'). 

 Fru.sl<a 



Fig. 1013. 



Can tharus suhlamtus 

 (Bast). Miocene; Eiiz- 

 esfeld, neariVienna. 



Fig. 1014. 



EInt ma mronls 

 (Brongt.). Eocene; 

 Ronea, nearVicenza. 



