73 



convex side. In some specimens there is a A-shaped depression near tlie dorsal edge of tiie 

 peristome. Equator rather straight on the shell's longitudinal axe; anterior aperture oblique 

 subcircular, the peristome inflexed along the dorsal margin. In some specimens the apex is 

 simple, in others there is a shallow notch on both the ventral and the dorsal side. None of 

 the specimens however are perfect so that this form of apex, which would be very peculiar for 

 the genus Cadzilus^ is perhaps only due to accidental erosion. 

 Length 14 mill., diam. of apert. 2 mill., diam. at equator 3,1 mill. 



Remarks. Compared to the specimens of Stat. 208, 271 and 284, those of Stat. 52 

 are a little more slender and slightly more bent. I hold them to be younger than the re.st; 

 the longitudinal furrows are here clearest visible; older specimens hardly show any longitudinal 

 reflection at all. 



21. Caduhis psaidolivi n. sp. PI. VI, fig. 67. 



Stat. 211. 5°4o'.7S., 120°45'.5 E. Banda Sea. 11 58 Metres. Coarse grey mud, superficial layer 



more liquid and brown. i Spec. 



Diagnosis. Shell white, shining, moderately curved, greatest swelling at about 3 mill., 

 trom the anterior aperture, measured on the outward, and at about 4 mill. 

 measured on the inward curve. Gibbosity slightly angular on all sides. 

 Tube at apex distinctly compressed between front and back curves. Apical 

 orihce flattened simple with thick walls. Anterior aperture rounded oval, 

 greatest diam. in antero-posterior direction, rather oblique thin-edged. Fig. 36. 



Length 13 mill., antero-posterior diam. of apert. 1,6 mill., lateral diam. Ant. apen. and apical oiifice 

 1,5 mill.; greatest diam. 3 mill. 

 Antero-posterior diam. of apex i mill; lateral diam. 0,7 mill. 



Remarks. Pseudolivi greatly rsembles C. olivi Scacchi from the Sicilian Pliocene, a 

 form which has been reported as recent by Jeffreys (F. Z. S. 1882, p. 663; Ann. Mag. Nat. 

 hist. (4) XIX, p. 157 and (5) M, p. 317) with the following distribution : Florö, Norway; Bay 

 of Biscay; Palermo; West of Ireland 1230 fms; South of the English Channel 862 fms. 



PiLSBRV (Man. of Conch. vol. XVII, p. 238) expresses his doubt whether the living forms 

 can be identified with the pliocene .species. Having not been able to compare the Siboga specimen 

 either with .Scacchi's types or with Jeffreys' examples I follow the safer coarse of describing 

 it separately. 



Here follows Pilsbry's description of a Jeffreysian example from the Sicilian Pliocene : 



Cadulus olivi Scacchi. 



Shell rather thin, moderately curved, the bend mainly posterior; moderately swollen, the 

 "equator" indistincdy angular, at the anterior third of the length, slightly oblique; thence 

 tapering moderately to the mouth, and more rapidly posteriorly, becoming attenuated toward 

 the apex. Outline of concave side slightly modified, becoming a tritle convex in the region of 



SIBOGA-EXPEDITIE LIV. 10 



