CALLIOSTOMA-EUTROCHUS. 407 



Philippi, Conchy lien Cabinet, pi. 18, fig. 15 (sic should be fig. 5) 

 represent the truejavanicus, from which zonamestus is distinguished 

 by the dark lines in the inter-liral spaces, crenulated lirseand decid- 

 edly crenulated umbilical rib. Fischer gives the locality 'Java, ' 

 but his figures exactly represent the West Indian shells. 



The fact seems to have escaped the attention of authors that Arthur 

 Adams himself considered his zonamestus a synonym of Javanicus. 

 Vide P. Z. S. 1854, p. 40. The above synonymy is merely tentative. 



C. YUCATECANUM Dall. PI. 48, figs. 19, 20. 



Shell belonging to the group of C. palmeri Dall, C. eximium 

 Rve., and C. lima of the western coast of America. Shell depressed- 

 conic with a rather acute apex and six whorls; nucleus white, 

 delicately sculptured; remainder of shell whitish with faint streaks 

 of brown transverse to the whorls, arranged so as to present the 

 appearance of seven brownish streaks radiating from the apex ; other 

 dots and streaks of brown irregularly distributed ; upper side of 

 whorls with one smooth revolving keel nearly midway between the 

 sutures, but a little nearer the periphery ; this gives the whorls a 

 somewhat tabulated aspect ; above this on the last whorl are four 

 smaller more or less beaded or crenulated keels, below it are two 

 without nodosities, reaching the gently rounded periphery ; between 

 these are intercalary threads or grooves ; base supplied with nine 

 rounded revolving ribs, those nearer the umbilicus with a tendency 

 to beading; interspaces about as wide as the ribs, which are crossed 

 by slight elevations due to lines of growth ; umbilicus perforate, 

 bordered by a strong white rib, inner wall smooth or transversely 

 striate ; pillar emarginate, twisted, not thickened, ending in a round 

 lump above the basal margin of the aperture ; the latter oblique, sub- 

 rectangular, nacreous, sharp-edged, crenulated by the ribs. Oper- 

 culum as usual in the genus. Alt. 7, diarn. 7 mill. (Dall.) 



Yucatan Strait, 640 fms. ; Of North Carolina, 15-32 fms. 



C. yncatecanum DALL, Bull. M. C. Z. ix, p. 47 ; ' Blake ' Gasterop., 

 p. 370, t. 24, f. 4. 



Most of the northern specimens are less elevated and proportion- 

 ately wider than the Blake specimen which has been figured, but 

 which seems to have been a little unusual in its elevation. (Dall.) 



C. SAYANUM Dall. PL 60, figs. 7, 8. 



Shell large, polished, solid, eight-whorled, having a good deal the 

 form of the C. tigris of New T Zealand ; timbilicated ; straw-yellow 



