411 



13 1^1' I4i "-^^ which at least 2 (uppermost whorl brokcni) form a smooth nucleus, with scarcely 

 convex whorls, probably about half a whorl with only a few smooth ribs must still be reckonecl 

 to the nucleus. Remaining whorls with a rather strong, nodulous, bilirate, infrasutural rib, 

 red-brown in the interstices of nodules, below this is a rather narrow excavated space, with 5 

 spiral threads and faint, descending, red-brown llammules, corresponding to th(; interstices of 

 the subsulural nodules, Unver part of whorls with slightly oblique, rather numerous ribs, 17 in 

 number on penultimate whorl ; the ribbed zone is convex, angular above, crossed by 4, on 

 lower whorls by 5 rather flat, stronger, spiral lirae and between these 2 fainter spirals, the 

 shell has moreover rather strong growth-lines, making the interstices between the ribs granular, 

 these interstices are more or less red-brown ; on last whorl, which is contracted below and ends 

 in a rather short, recurved canal, the ribs become fainter below periphery ; near and on the 

 canal the darker colour reappears in a fainter way ; the last whorl is humpbacked by a strong, 

 oblique varix, even continued in a fainter manner on the canal, this last whorl with canal is 

 crossed by about 20 principal lirae. Aperture oblong, with a rather deep sinus above, narrower at its 

 entrance than behind, where it is regularly rounded; peristome rather thin, with a large sinus near 

 the limit of last whorl and canal, columellar margin tubercled above, then slightly concave, running 

 nearly straight in the narrow, slightly contorted and upturned canal, it is strongly enamelled, 

 especially below, where it leaves a conspicuous umbilical slit. Interior of aperture white. 



Alt. 32, lat. qY^: apert. alt. 12, lat. 3^2 Mill. 



This species has some resemblance with the preceding ones, but may be easily distin- 

 guished by its sculpture, especially by the single, strong varix on the back, the numerous ribs 

 and by its colour, most of the specimens are smaller, probably young. 



15. Drillia rtcbrozonata n. sp. PI. XXVI, fig. 7. 



Stat. 51. Madura-bay. 69 — -91 M. Fine grey sand, coarse sand with shells and stones, i Spec. 

 Stat. 285. South coast of Timor. 34 M. Limit between mud and coral. 2 Spec. 



Shell small, rather broadly fusiform, with moderately long spire, subpellucid, whitish, 

 painted with purplish red-brown. Whorls 9, of which about 3 form a smooth nucleus, with 

 slightly convex sides and 3 or 4 ribs at the end of last nuclear whorl. Postnuclear whorls 

 convex, separated by an undulated suture, with rather thick, rounded ribs, 9 or 10 in number 

 on penultimate whorl ; these ribs occupy the whole space of the upper whorls, they are slightly 

 angular below a narrow infrasutural excavation, especially on last whorl and become less distinct 

 on base of last whorl, where they disappear at last on the canal. Of the spirals firstly a strong 

 one, with oblong nodules corresponding to the ribs, border the suture, it is accompanied by a 

 much finer one in the excavation, 3 rather strong spirals cross the lower part of each whorl, 

 and amount to about \ 7 on last whorl and canal, with eventually a narrow intermediate one 

 in the interstices of last whorl. The shell has moreover strong, riblike growth-striae, making 

 the interstices of the ribs somewhat granular. The red-brown colour appears in the interstices 

 of the nodules of subsutural rib, and between the ribs in the excavation, forming on lower 

 part of last whorl, 2 more or less distinct bands, one at the periphery, the other at the base 

 of last whorl, the base of canal is of the same colour, which in some instances occupies nearly 



47 



