2 2 7 



it is very perplexing to see how the opinion of authors differs in the appreciation of the 

 limits of the species or varieties more or less allied to S. lamellosa. I have followed Messrs. 

 Melvill and Standen (Proc. Zool. Soc. Lond. 1901, p. 356), who have made use of the 

 familiar name lamellosa^ Mr. Melvill being in 1903 still of the same opinion (Journ. of Conch. 

 Vol. 10, p. 348). 



13. Scala (Opalia) sp. ? 



Stat. 45. 7°24'S., 1 18° 1 5'. 2 E. Floras Sea. 794 M. Fine grey mud. i Spec. 



This species may be new, but it is though large (nearly 20 Mill, in length), too much 

 worn, with broken aperture, consequently not recognizable, so I thought it better not to describe 

 a species, without a knowledge of the true colour, of sculpture and aperture. 



14. Scala (Opalia) htuiierosa n. sp. PL XIV, fig. 7.' 



Stat. 241. 2°24'.3S., 1 29° 49'. 3 E. Banda Sea. 1570 M. Dark sand with small stones, i Spec. 



Shell elongately pyramidal, imperforate, moderately thin, white; nucleus wanting; remaining 

 whorls 1 1 , convex, slightly contracted below the deep suture, there shouldered or angular ; 

 sculpture consisting of low spiral ridges, about 13 on last whorl, of which the basal one forms 

 the rib characteristic for the subgenus, a small space above that rib and a larger one below 

 the suture are free of ridges; the whorls are crossed by strong ribs, 13 in number on the last 

 whorl, not quite reaching the upper suture; these ribs are angular at the shoulder and less so 

 below, they are crossed by the ridges, which are however less sharp on the ribs, perhaps on 

 account of friction ; the interstices have fine, hairlike, elevated striae, which are also present on 

 the sides of the ribs. Base with traces of ridges and with the hairlike striae, but in a much 

 fainter degree. Aperture subcircular, slightly angular above, below and fainter at the end of 

 the shoulder and of the basal rib. Columellar margin reflected over the umbilical region, outer 

 margin thin (juvenile?). 



Alt. 15, lat. 4Yg; apert. alt. 27^, lat. 2 Mill. 



I know no described species of Opalia, to which this new form is allied. 



15. Scala (Opalia) Sibogae n. sp. PL XIV, fig. 8. 



Stat. 159. o°59'.iS., I29°48'.8 E. Halniahera Sea. 411 M. Coarse sand, i Spec. 



Shell elongately pyramidal, imperforate, solid, corneous; nucleus wanting; remaining whorls 

 loYs, convex, with a deep suture, slightly shouldered; sculpture consisting of 3 strong spiral 

 ridges and a few spiral striae in the interstices, crossed by strong ribs, 12 on last whorl, angular 

 above, when the upper spiral crosses the ribs, being slightly nodulous by the intercrossing of 

 the strong spirals ; some of the ribs have the appearance of varices, a. o. that next the aperture ; 

 last whorl with 4 spirals, of which one is the usual basal one ; base with a few very faint 

 spirals; the whole shell, especially the base is covered with very fine growth-striae. Aperture 



119 



