558 



MOLLUSCA 



PHYLUM VI 



wholly or imrtially covered by margins of the inner and outer lips. OpermliLm horny. 

 Cretaceous to Keceiit. 



Murex Linn. {Tigs. 1020-1022). Shell roimded, spire prominent. Surface with at 

 least three, often more than three varices or transverse rows of spines or nodes on each 



whorl. Apei'ture ovate ; inner lip smooth, outer lip 

 thickened. Canal much prolonged, partially closed, 

 usually spinose. Cretaceous to Recent. 



Fio. 1020. 



Mwrex (Phylloiwtns) sedgwichi Miclit. 

 Miocene ; Gainfahrn, near Vienna. 



Fig. 1022. Fig. 1023. 



Fig lO'^l 



Murex (Purpura) Typhis tuhifer 



Murex sjiinicost a Bronn. t'nmriniituslja.m. Eo- Montf. Calcaire 



Miocene ; Baden near cene ; Damery, near Grossier; Grignon, 



Vienna. Bpernay. near Paris. 



Subgenera : Haustellum Klein ; Rhinacantha Adams ; CMcoreus, Phyllonotus (Fig. 1020) 

 Montfort ; Purpura Martyn {Ptero7iotus Swsiinson) (Fig. 1022) ; Tritonalia Fleming {Ocinebra 

 Leach), etc. 



Typhis Montf. (Fig. 1023). Like Murex, but with hollow spines. Canal short, 



completely closed. Upper Cretaceous to Re- 

 cent. 



Trofhon Montf Spire high. Longitu- 

 dinal ribs replaced by thin lamellae. Canal 

 open, somewhat curved. Tertiary and Recent. 



Family 4. Thaisidae Dall, 



Shell thick, usually ovoid; spire short, 

 body ivhorl large. Aperture wide, inner lip 

 and columella more or -less flattened ; canal 

 short. Operculum horny. Cretaceous to Re- 

 cent. 



Fig. 1024, 



Thais exilis 

 Partscli. Mio- 

 cene ; Miillcrs- 

 dorf, near Vienna. 



Pio. 1025. Thais Bolten (Purpura Brug.) (Fig. 1024). 



Rapana laxecarinahi Miclit. Imperforate ; body whorl witli transverse 

 ougocene ; Santa Giustina, j^.^y^g q^. ^^^^^^^ Aperture oval, columella flat- 

 tened, smooth. Tertiary and Recent. 

 Rapana Schum. (Fig. 1025). Like the preceding, but perforate. Inner lip callous, 

 expanded. Cretaceous to Recent. 



Lysis Gabb ; Stenomphalus Sandberger. Cretaceous and Tertiary. 

 Sistrum Montf {Ricinula Lam.) ; Acanthina Fischer de Waldheim (Monoceros 

 Lam.) ; Goncholepas Lam. ; Gymia Morch, etc. Tertiary and Recent. 



