XIV 



MONOTOCARDIA— RACHIGLOSSA 



425 



Fig. 282. — Voluta ni- 

 vosa Lam., West 

 Australia, x ?. 



narrow, no operculum. Cretaceous . Principal genera 



Mitra (with many sections), subg., Strigatella, 

 Mitreola^ Mutyca^ Dlbaj^hus ; Plochelaea (Ter- 

 tiary), Thala ; Turricula (with several sec- 

 tions), Qyllndromitra^ and Imbricaria. 



Fam. 9. Volutidae. — Foot broacl in front, 

 head laterally dilated into lobes, on which 

 are placed the sessile eyes ; siphon prominent, 

 with appendages at the base (radula. Fig. 122, 

 p. 221) ; shell thick, often shining, fusiform, 

 globular or cylindrical, columella projecting 

 anteriorly, with several folds, the anterior of 

 which is the largest, aperture notched, canal 

 not produced, operculum generally absent. 



Cretaceous . Principal genera: Crypto- 



chorda (Eocene), Zidona^ Provocato}\ Guivil- 

 lea, Yetus (^= Cymhiunfi)^ Voluta (with many sections), Voluto- 

 Uthes (chiefly Eocene), Volutolyria^ Lyria^ Enaeta^ Volutomitra. 

 Fam. 10. Marginellidae. — Foot broad, siphon without ap- 

 pendages, mantle largely reflected over the shell ; radula with- 

 out laterals, central tooth comb-like, cusps rather blunt; shell 

 oval or conoidal, polished, aperture narrow, 

 outer lip thickened, columella with many 

 folds; no operculum. Eocene . Prin- 

 cipal genera : Marginella^ with many sections 

 and so-called sub-genera ; Persicula^ Pachy- 

 hathron (?), Cystiscus^ Microvoluta. 



Fam. 11. Harindae. — Foot large, with a 

 transverse groove, separating off a semi-lunar 

 propodium ; mantle partly reflected over the 

 shell ; shell ventricose, polished ; spire short, 

 strongly longitudinally ribbed, ribs prolonged 

 over the suture, columella callous ; no oper- 

 culum. Eocene . Single genus, Harpa 



Fig. 2%'d.-0liva por- r^^^\,^^^ SUict). 

 p/i?/ria Lam., Panama. -r? ^^^7.•^ t» t 



Fam. 12. Olividae. — Propodium semi- 

 lunar, with a longitudinal groove above, 

 mesopodium reflected laterally over the shell ; central tooth of 

 radula tricuspid on a very broad base, lateral simple, hooked ; 

 shell sub-cylindi'ical or fusiform, polished; aperture narrow, 



