478 



MOLLUSCA 



SUB-KINGDOM VI 



Rapana, Schum. (Fig. 976). Like the preceding, but perforate, 

 expanded. Cretaceous to Recent. 



Lysis, Gabb ; Stenomphalus, Sandberger. 

 Cretaceous and Tertiary. 



Sistrum, Montf. (Ricinula, Lam.) ; Mono- 

 ceros, Lam. ; Concholepas, Lam. ; Cymia, 

 Morch, etc. Tertiary and Recent. 



Family 5. Fusidae. Tryon. 



Shell turreted, fusiform or ovoid, generally 

 without varices. Canal more or less elongated. 

 Inner lip smooth, or with weak columellar 

 folds ; outer margin thin. Operculum horny. 

 Jura to Recent. 



These shells are sparse in the Upper Jura 



Inner lip callous, 



FIG. 975. 

 Purpurct exilis, 



and Cretaceous, but abundant in the Tertiary Partsch. Mio- 



mi i T/. T -i cene ; Mollers- 



and Recent. The animal diners but little dorf, near Vienna. 



FIG. 976. 



Rapana laxecarinuta, Micht, 

 Oligocene ; Santa Giustina, 

 Italy. 



from that of the Buccinidae and Muricidae. 



Fusus, Lam. (Coins, Humph.), (Fig. 977). Shell narrow, elongate ; spire acuminate. 



Aperture ovate ; canal very long, straight, open. 

 Outer margin thin, sometimes crenulate, and 

 often striate within ; columella smooth. Rare 

 in Upper Jura and Cretaceous, very profuse in 

 Tertiary and Recent. 



Clavella, Swains. (Cyrtulus, Hinds), (Fig. 

 978). Thick-shelled, smooth, or with fine spiral 

 striae. Body whorl 

 suddenly contracted 

 anteriorly. Canal 

 very long, straight. 

 Common in Eocene ; 

 rare Neocene and 

 Recent. 



Sycum, Bayle 

 (Leiostoma, Swains.), 

 (Fig. 979). Spire 

 short ; body whorl 

 inflated, smooth, 

 somewhat flattened 

 below the suture. 

 Inner lip smooth ; 

 canal straight. 

 Common in tin- 



.. <>7s. 



FIG. 977. 



ng 



Brocchi. Miocene ; 

 Baden, near 



Vienna. 



rare in 



('li/rr//ii Inngaevus, Lam. 

 Eocene ; Damery, near 

 Epernay. 



Sycum bulbiformis, Lain. Cal- 

 caire Grossier ; Grignon, near 

 Paris. 



Eocene ; 

 Miocene. 



Fascio I aria, 

 Lam. (Fig. 980). 



Like Fusus, but distinguished in general by having a shorter spire, more inflated 

 body whorl, a wider and more sinuous or flexuous canal, and in that the anterior- 

 portion of the columella has two or three oblique plications. Cretaceous to 

 Recent. 



Latirus, Montf. (Fig. 981). Shell fusiform, turreted ; spire costate. Aperture 



