562 



MOLLUSCA 



PHYLUM VI 



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



to the present time. 



Cryptochorda Murch (? Harpopsis Mayer) 

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

 body whorl large, smooth, lustrous. Aperture 

 with short recurved canal ; inner lip callous. 

 Common in the Eocene. 



Family 9. Olividae d'Orbigny. 



Fig. 1038. 



Harpa mutlca Lam. 

 CalcaireGrossier; Grig- 

 non, near Paris. 



Fio. 1039. 



Vryjitochorda strom- 

 hoidcs (Lam.). Calcaire 

 Grossier ; Uamery, near 

 Epernay. 



Shell elongate-oval to subcylindrical, solid, 

 smooth and glistening. Spire short ; body 

 whorl very large. Aperture narrow ; outer 

 lip sharp ; colitmella anteriorly loith an out- 

 loardly reflected callus. Canal very short. 

 Cretaceous to Eecent. 



Oliva Martyn (Fig. 1040). Shell subcylindrical ; 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. (Ancillaria Lam.) (Fig. 1041). 

 Shell oblong, occasionally acuminate. Suture 

 usually covered over by a lustrous enamel -like 

 callus. Aperture somewhat bi'oadened anteriorly ; 

 columellar callus slightly twisted. Cretaceous to 

 Recent. 



Superfamily 5. TOXOGLOSSA Troschel. 



1040. 



(Jlh-a dai'ukt Lam. 

 Miocene ; Dax, near 

 Bordeaux. 



Fig. 1041. 



Ancilla ijlandi- 

 fonnis Lam. Plio- 

 cene ; Steinabrunn. 



Radula typically with only two arroio-shaped 

 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. Cancellariidae Adams. 



Shell oval to tiirreted. Spire acuminate ; body 

 whorl inflated ; surface transversely ribbed and in most 

 cases cancellated. Aperture with short canal or notch ; 

 columella with several strong oblique folds, outer lip 

 grooved internally. Upper Ci'etaceous to Recent. 



The typical genus Gancellaria Lam. (Fig. 1042) 

 attains a maximum distribution in the late Tertiary and Recent. 



Firi. 1042. 



Canixllaria can 

 (;eHafci(Linn.). Mio 

 cene ; Gainfalirn 

 near Vienna. 



Family 2. Terebridae Adams. 



Shell turreted, slender, acuminate, with small body ivhorl. 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 



Pio. 1043. 



Terebra (wiivi inata 

 Borson. Miocene ; 

 Baden, near Vienna. 



