CLASS IV 



GASTROPODA 



557 



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

 species exceeding 200 in number, and distributed in numerous subgenera. 



Cyclonassa Agassiz ; Oijllime Gray ; Truncaria Adams ; Buccino%isis Conrad. 

 Tertiary and Recent. 



Chrysodomus Swains. {Nefhmea p.p. Bolten). Elongate-ovoid, inflated, sometimes 

 sinistral, with 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.]).; Myristica Swains.) (Fig. 

 1017). Pyriform, inflated, with 

 short spire. Body whorl large, 

 longitudinally striated and beset 

 with nodes or rows of sjaines. Inner 



Fig. 1015. 



Na<isa clathrata Brocchi. 

 Pliocene ; Larniano, Tus- 

 cany. 



Pig. lOlS. 



Tudicla rusticula 

 (Bast.)- Miocene; Grand, 

 n(!ar Vienna. 



Fig. 1010. 



Hemifusus siCbcarinatus 

 (Lam.). Eocene (Sables 

 moyens) ; Senlis, Seine- 

 et-Oise. 



Pig. 1017. 

 Melongena cornuta Agassiz Miocene ; Bordeaux. 



Fio. 1019. 



Strepsidura ficuhiea 

 (Lam.). CaleaireGrossier; 

 Damery, near Epernay. 



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

 Tertiary and Recent. 



Busycon Bolten (Fulgiir Montfort). Tertiary and Recent. 



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

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



Strepsidura Swains. (Fig. 1019). Spire short ; body wdiorl inflated, transversely 

 ribbed ; canal curved. Eocene and Miocene. 



Family 3. Muricidae Tryon. 



Shell thick. Spire moderately high ; whorls %oith transverse swellings, ribs or folia, 

 and frequently spinose. Aperture rounded or oval; canal more or less elongated, 



