3i4 



which Kien'er (1. c.) says nothing, makes it doubtful to me, that Tryon has known the true 

 elegans. The Siboga-specimens very vvell agree with Kiener's description and figure, though 

 in most specimens the spire is slightly shorter. I can not make out if Reeve's fig. 10 in his 

 monograph of Nassa, be this species or N. taenia as Tryon suggests, as Reeve has given only 

 a back view. However I should incline to think Reeve's figure may be a large N. elegans. 



var. fnlgurans n. var. PI. XIX, fig. 10. 



Stat. 204. Betvveen islands of Wowoni and Buton, Northern entrance of Buton-strait. 75 — 94 M. 



Sand with dead shells. 1 Spec. 

 Stat. 279. Ruma-Kuda-bay, Roma-island. 36 M. Mud and sand. 1 Spec. 



Shell differing from the type in colour-markings, the variety being painted with brown 

 on lower whorls, having especially in the specimen from Stat. 279 the character of fulgurations 

 or ziczac-lines, the specimen from Stat. 204 is a little bleached. 



That from Stat. 204 sufficiently agrees in sculpture of upper whorls with the type, in 

 that from Stat. 279 the riblets are coarser and extend over more whorls, only a little more 

 than 2 whorls remaining ribless. 



10. Nassa (Alectryon) Jlammulata n. sp. PI. XIX, fig. 12. 



Stat. 279. Ruma-Kuda-bay, Roma-island. 36 M. Mud and sand. 2 Spec. 



Shell ovately-conical, with rather long spire, dark flesh-coloured, with irregular brown 

 flames, forming a more or less conspicuous brown spot on the back of last whorl. Whorls 9, 

 of which 3 smooth ones form the nucleus, which has a brown subsutural band and a peripheral 

 keel. Subsequent whorls with strong, rounded ribs, which are at first narrower than the spirally 

 striated interstices, then about equal in breadth, and disappear on the S th whorl, the last being 

 quite smooth, but for microscopic growth-striae, very inconspicuous spiral striae and about 5 

 deep basal striae or grooves; the whorls are rather convex, separated by a deep suture. Aperture 

 broadly oval, slightly canaliculate above, peristome with a blunt border, internally with about 

 1 7 irregular lirae, which are not strong, with exception of the basal one, bordering the canal, 

 which is toothlike. Columellar margin with a rather strong layer of enamel, callous at the 

 upper part near the upper canal, a strong, short fold at some distance from the callous margin 

 and a row of small guttules; basal fold thick, nearly toothlike in front. Basal canal rather 

 deep, callously bordered. 



Alt. 16, lat. 8 3 / 4 ; apert. alt. (with canal) 8, lat. 4 3 / t Mill. 



Alt. 14Y4, 7 1 /_ t ; apert. alt. (with canal) 6 1 /,, lat. 4 Mill. 



Of the two specimens only the smallest is adult and has chiefly served for description ; 



the largest, though full-grown, has the aperture not yet developed, its margin being smooth 



ancl should locate the species in the Section Nassa s. str., together with N. mutabilis. As the 



shells are in other respects identical, I think they are best located in Alectryon. The nearest 



ally may be N. elegans, but the crSssicostate upper postnuclear whorls are quite different from 



those of that species. 



68 



