CLASS IV 



GASTROPODA 



r)63 



is characterised by a line running parallel witli the sutiue, and creating a narrow 

 suture band. Duplicaria Dali lias the sutiire channelled. 



Family 3. Turritidae Adams (Pleuratomidae Stoliczka). 



Shell fusiform, with moderately high spire. Äperture elongated, produced anteriorly 

 in a longer or shorter canal. Outer lip with a slit or notch below the suture. Operculum 

 horny, sometimes ahsent. Cretaceous to Recent. 



Upwards of 700 recent and 1000 fossil species have been described, of which 28 

 are Cretaceous. 



Turris Bolten {Pleurotoma Lam.) (Figs. 1044-1047). Shell turriciüated, spire long. 

 A B c A B 



Fig. 1044. 

 A, Turris notata (Brocchi) var. (=r. monilis 

 Hoernes). Miocene ; Baden, near Vienna. B, T. (Sur- 

 cula) lamarcki Bell. Miocene ; Baden, near Vienna. 

 C, T. (Surcula) hclgica Nyst. Oligocene ; Weiuheim, 

 near Alzey. 



Body whorl of nearly equal length with the spire 

 margin smooth. Outer mar- 

 gin of the äperture with a 

 narrow, deep sinus, situated 

 at or some distance below the 

 suture. Operculum pointed 

 ovate, with apical nucleus. 

 Cretaceous to Recent. 



Subgenera : Surcula (Fig. 

 1044, B, G) ; Genota Adams 

 (Fig. 1045, A) ; Bathytoma 

 Harris (Fig. 1046) ; Oligotoma, 

 Rouaultia Bellardi ; Crypto- 

 conus V. Koenen (Fig. 1045, B) ; 

 Drillia (Fig. 1047) ; Bela Gray ; 

 Lachesis Risso, etc. 



Ölavatula Lamarck (Fig. ^^^^ j^^g^ 



1048). Differs from Turris ^.^^^^ '(Bathytoma) 

 proper in that the outer margin cataphmcta Brocchi. 



f ^ , , ,, . . T Miocene ; Baden, near 



is cut by a shallow triangulär vienna. 



notch, and the nucleus of the 



operculum is situated in the middle of the anterior margin. 



Subgenera : Pseudotoma, Glinura Bellardi. 



Fig. 1045. 



A, Tnrris (Genota) ramosa Bast. 

 Miocene ; Grund, Hungary. B, 

 T. (Cryptocojius) filosa (L&m.). Cal- 

 caire Grossier; Grignon, near Paris. 



canal long and straight ; columeUar 



Fig. 1047. 

 Turris (Drillia) 

 incrassata Diij. Mio- 

 cene ; Steinabmnn, 

 near Vienna. -/j. 



Fig. 1048. 

 Clavatula asfiendata 

 Lamarck, Miocene ; 

 Gnind, Hnngary. 



Cretaceous to Recent 



