CLASS IV 



GASTROPODA 



Sparse in Upper Cretaceous and Eocene, abundant in Miocene and Pliocene ; living 

 species exceediiig 200 in number, and distiibuted in numerous suljgenera. . 



Gyclonassa Agassiz ; Gyllene Gray ; Truncaria Adams ; Buccinopsis Conrad. 

 Tertiary and Recent. 



Ghrysodomus Swains. {Neptunea p.p. Bolten). Elongate-ovoid, inflated, sometimes 

 sinistral, witb rather short and moderately bent canal. Cretaceous to Recent. C. 

 contrarius Lam. Crag. 



Siphonalia, Zemira, Metula Adams ; Euthria Gray ; Hemifusus Swainson (Fig. 

 1016). Tertiary and Recent. Mitraefusus and Genea Bellardi. Neocene. 

 Melongena Schum. {Pyrula 

 Lam. p.p.; Myristica Swains.) (Fig. 

 1017). Pyritbrm, inflated, with 

 short spire. Body wliorl large, 

 longitudinally striated and beset 

 with nodes or rows of spines. Inner 



Fig. 1015. 



Nassa clathrata Brocchi, 

 Pliocene ; Larniano, Tus 

 eany. 



Fig. 1016. 

 Hemifusus subcarinrüus 

 (Lam.). Eocene (Sables 

 moyens) ; Senlis, Seine- 

 et-Oise. 



Fig. 1017. 

 Melongena cornuta Agassiz, Miocene ; Bordeaux. 



Fio. 1019. 



Strepsidura ficulnea 

 (Lam.). CalcaireGrossier; 

 Damery, near Epernay. 



lip smooth; aperture gradually becoming merged into the short and wide canal. 

 Tertiary and Recent. 



Bu^con Bolten {Fulgur Montfort). Tertiary and Recent. 



Tudicla Bolten (Fig. 1018). Resembles FuUjur but has a straight and very long 

 canal ; inner lip with a fold. Cretaceous to Recent. 



Strepsidura Swains. (Fig. 1019). Spire short ; body whorl inflated, tmnsversely 

 ribbed : canal curved. Eocene and Miocene. 



Family 3. Muricidae Tryon. 

 Shell thick Spire moderately high ; whorls with transverse swellings, ribs or folia, 

 and frequently spinöse. 



Aperture rounded or oval; canal more or less elongateJ^ 



