MOLLUSCA— GASTROPODA. 601 



V. Canal strongly deflected 58. 



58. Surface with spirals and in some cases with ribs also. 



CXLIX. Siphonalia. 



58. Surface with ribs and spirals, the former often thickened and 



spinose CLXXIX. H Murex. 



V . Canal straight or faintly deflected, aperture wide, surface with 

 spirals and ribs rarely smooth 59. 



59. Spirals faint, sometimes obsolete CL. Neptunea. 



59. Spirals moderate, shell small, aperture rather abruptly 



contracted CLXVIII. Lirofusus. 



59. Spirals strong, shell large, aperture but slightly contracted. 



CXLVIII. Buccinofusus. 

 25*. Shell not fusiform, spire small, aperture occupying greatest length of 



shell or nearly so j / . 



y. Shells short and thick, more or less globular 60. 



60. All whorls smooth, not umbilicated CXC. Ancillopsis. 



60. Whorls more or less ornamented, at least the earlier ones ; 



shell umbilicated CLXXIII. Lacinia. 



y. Shell elongate 61. 



61. Columella with plications or oblique grooves, outer lip 



smooth mm / . 



mm 7 . Whorls rounded in adult 24-f-. 



24f. With continuous ribs. ...CLXXXV. Volutilithes . 



24f. Without ribs 6J. 



6J. Round-whorled in adult only. 



CLXXXVII. Aurinia. 



6 %. Round-whorled and smooth throughout h. 



h. Aperture narrow behind, widening for- 

 ward g / . 



g / . Surface smooth. 



CLXXXVII I. O/iva. 

 </. Surface vertically striate. 



CLXXXIX. Olivula. 

 h. Aperture more or less patulous. 



CLXXVI. Caricella. 



mm 7 . Whorls angulated 25f. 



25-f. With continuous ribs, spinous or tuberculated on 



angle CLXXXV. Volutilithes. 



25f . Generally spinous, aperture broad in front. 



CLXXXVI. Voluta. 



61. Columella plicate nn'. 



nn'. Columellar and outer lip with numerous small notches. 



CXLII. Cyprea. 

 nn'. Columella smooth except for plications ; outer lip 



notched CXLIII. Erato. 



nn'. Outer lip smooth CLXXXIII. Marginella. 



6 1 . Columella smooth oo' . 



oo r . Form conical, spire flat CXCVI. Conus. 



oo 7 . Form subconical, spire elevated CLV. Fulgur. 



19. Aperture with expanded outer lip 26*. 



