RHIPIDOGLOSSA -i:.l 



iiiiin lip often truncated anteriorly, thickened or 



Sub-genera : Tectus, Montf. (Fig. 833) ; Polydonta, Schum. ; Clanculus, Montf., etc. 



SUB-ORDER B 



flat; base angular at p.-riplu-ry. 

 with Un-tli. Silurian to 



FK.. 



nodosa, Miinst. 

 Keuper ; St. Cassian, Tyrol. 



Fi... 



Minimi, ,,!(<!. (Oj'lixtl'll-) /Xltulll, 



Brocchi. Miocene ; Steina- 

 bninn, near Vienna. 



Fn,. 886. 



<l!iii>nla picta, 

 Eichw. Min- 

 cene ; Wiesen, 



near Vienna. 



Fi... 



<;i i'i> nl BroccJi li, 

 Mayer. Pliocene; 

 Montopoli, Tuscany. 



Monodonta, Lam. (Figs. 834, 835). Turbinate, with nearly round aperture, the 



FIG. 838. 



Ccdliostoma semi- 

 punctatum, Miinst. 

 Keuper ; St. Cas- 

 sian, Tyrol. 2/j. 



Solariella peregrinn, 

 Libassi sp. Pliocene ; Or- 

 ciano, Tuscany. 



FIG. 839. 



Calliostoma oc<///"//s. 

 Buv. Coral-Rag ; St. 

 Michiel, Meuae. 



Fm. 840. 



Lewisiella conica, d'Orb. 

 sp. Middle Lias; M;:y, 

 Calvados. 



Fi.:. 84-2. 



rita margaritnln. 

 Mer. Oligocene; Weinheim. 

 near Alzey, Baden. 



columella ending below in a tooth. Trias to Recent. 

 Oxystele, Phil., the tooth is wanting. 



Gibbula, Risso (Figs. 836, 837). Turbinate or low 

 conic, umbilicate, and with rounded aperture. Tertiary 

 and Recent. 



Calliostoma^ Swains. (Ziziphinus, Gray), (Figs. 838, 

 839). Conical, with peripheral keel and flattened base. 

 Trias to Recent. 



Other genera are Cantharidus, Montfort ; Lewisiella, 

 Stol. (Fig. 840) ; Chlorostoma, Swains. ; Solariella, 

 Wood (Fig. 841); Margarita, Leach (Fig. 842); 

 Danilia, Brus. (Fig. 843), etc. Most of these have a 

 more or less extensive Tertiary history. 



In the sub-genera Osilidus and 



Fie. 843. 

 dntlirntn, Etall. sp. Coral- 



R:i- : Valtin, Ain. 2/1- 



Family 12. Umboniidae. Adams. 



Shell small, usually depressed discoidal, smooth and lustrous, or with fine spiral 

 striae, and without nacreous layer. Outer lip sharp, peristome discontinuous. Umbilicus 

 often concealed by a callus; operculum horny. Silurian to Recent. 



Allied to the recent genera Umbonium, Link. (Rotella, Lam.), Isanda, Adam>, 

 Camitia, Gray, etc., are a number of fossil forms, such as Pycnomphalus, Lindstrom, 

 from the Silurian and Devonian ; Anomphalus, Meek and Worthen, and Rotellina, de 



