562 



MOLLUSCA 



PHYLÜM VI 



The typical genus Harpa Lam. {Silia Mayer) (Fig. 1038), ranges from tlie Eocene 



to the present time. 



Gryptochorda Mörcli (? Harpopsis Mayer) 

 (Fig. 1039). Elongate-oval ; spire short, 

 body wliorl large, smooth, lustrous. Aperture 

 with Short recurved canal ; inner lip callous. 

 Common in the Eocene. 



Family 9. Olividae d'Orbigny. 



Fig. 1038. 



Harpa mutica Lam. 

 CalcaireGrossier; Grig- 

 noii, near Paris. 



Fig. 1039. 



Gryptochorda ström- 

 boides (Lam.). Calcaire 

 Grossier ; Damery, near 

 Epernay. 



Shell elongate-oval to suhcylindrical, solid, 

 smooth and glistening. Spire short ; body 

 whorl very large. Aperture narrow ; outer 

 lip sharp ; columella anteriorly with an out- 

 wardly reflected callus. Canal very short. 

 Cretaceous to Kecent. 



Oliva Martyn (Fig. 1040). Shell suhcylindrical ; suture line marked by a deep 

 groove. Columellar callus obliquely folded. . Cre- 

 taceous to Recent. 



Olivella Swainson. Small, with acute en- 

 amelled spire. Tertiary and Recent. 



Ancilla Lam. (Äncillaria Lam.) (Fig. 1041). 

 Shell oblong, occasionally acuminate. Suture 

 usually covered over by a lustrous enamel-like 

 callus. Aperture somewhat broadened anteriorly ; 

 columellar callus slightly twisted. Cretaceous to 

 Recent. 



Superfamily 5. TOXOGLOSSA TroscheL 



Fig. 1040. 



Oliva clavula. Lam. 

 Miocene ; Dax, near 

 Bordeaux. 



Fig. 1041. 



Ancilla ijlandi- 

 formis Lam. Mio- 

 cene ; Steinabrunn. 



Radula typically with only two arrow 

 teeth in each transverse row, although occasionally as many as five teeth are developed- 

 Shell similar to that of the Rachiglossa. 



This group is most closely allied to the Rachi- 

 glossa, from which it probably became differentiated 

 in the Cretaceous. The Tertiary and Recent species are 

 excessively profuse. All are carnivorous and marine. 



Family 1. Oancellariidae Adams. 



Shell oval to turreted. Spire acuminate; hody 

 whorl inßated ; surface transversely ribhed and in most 

 cases cancellated. Aperture with short canal or notch ; 

 columella with several strong oblique folds, outer lip 

 grooved internally. Upper Cretaceous to Recent. 



The typical genus Gancellaria Lam. (Fig. 1042) 

 attains a maximum distribution in the late Tertiary and Recent. 



Fig. 1042. 



Gancellaria can- 

 cellata (Linn.). Mio 

 cene ; Gainfahrn, 

 near Vienna. 



Family 2. Terebridae Adams. 



Shell turreted, slender, acuminate, with small body whorl. Aperture 

 oval or quadrilateral ; canal short, curved ; outer lip sharp. Oper- 

 culum horny. Tertiary and Recent. 



Of the two leading genera, Terebra Lam. (Fig. 1043) and Hastula Adams, the first 



Fig. 1043. 



Terchra acuminata 

 Borson. Miocene ; 

 Baden, near Vienna. 



