o 1 / 



curved ribs, about 22 in number on last whorl, these ribs are narrow, with broader interstices, 

 especially on last whorl; they are crossed and rendered slightly granose by spiral lirae, about 

 16 in number on last whorl, of which the upper one, bordering the suture is stronger and 

 separated by a groove, thus making the sutures beadcd. Aperture oval, with a sinus above ; 

 peristome blunt, with a thick, flat rib externally, this rib is crossed by the spiral lirae, internall)- 

 the peristome has 5 or 6 denticles, of which the basal one luis the appearance of a tooth. 

 Columellar side enameled, with a plait above and a few wrinkles and pustules below. Canal 

 rather deep and wide, narrow at its entrance, by the basal fold of columella and tooth of 

 peristome. 



Alt. 7, lat. 4; apert. alt. (with canal) 3, lat. i 1 /, Mill. 



It is not without hesitation that I describe this and some of the next species as new. 

 It resembles in many respects N. collaticia Melvill and N. munda Sturany, especially the 

 smaller specimens of the latter, but seems to be distinguishable from those species, by having 

 a different number of ribs, 22 against 12 or 26; in X. munda the whorls are strongly gradate. 

 I have located the species it the Section Alccti-you, of which Aciculina is according to Cossmanx 

 a subsection, on account of its resemblance with N. collaticia. 



var. brevis n. var. 



Shell more ventricose, consequently relatively shorter. 



Alt. 7, lat. 4; apert. alt. (with canal) 3 1 /;,, lat. 1 1 /» Mill. 



By the utmost liberality of Dr. Sturany, who sent me for comparison, the whole material 

 of N. munda, sporadica, stiphra ancl lathraica, I have been able to satisfy myself, that these 

 species are different from my new ones. 



iS. Nassa (Alectryon, Aciculina) macroccphala n. sp. PI. XX, fig. 2. 



Stat. 1 14. Kwandang-bay-entrance. 75 M. Hard sand very fine. 7 Spec. 



Stat. 1 16. West of Kwandang-bay-entrance. 72 M. Fine sand with mud. 2 Spec. 



Shell very small, ovately conic, with moderately long spire, greyish-white (bleached ?). 

 Whorls 7, of which about 4 form the nucleus, which is uncommonly large, smooth and shining, 

 with very convex whorls and a conspicuous peripheral keel. Subsequent whorls only slightly 

 convex, separated by a conspicuous suture. Sculpture consisting of nearly straight ribs, which 

 are rather broacl, but in most cases narrower than the interstices, 14 on penultimate whorl, 14 

 to 17 on last whorl. They are crossed by a groove, a little below the suture, making the ribs 

 more or less beaded above, some impressed striae and a few (about 5) basal lirae, rendering 

 the ribs granulose. Aperture oval, with an obtuse angle above. Peristome blunt, with a thick 

 rib externally, lirate towarcls the base, and 5 to 6 pustules internally, of which the basal one 

 is toothlike. Columellar side with a conspicuous layer of enamel, a small fold above and a l'cw 

 pustules below, ending in a strong fold. Canal moderately wide and deep. 



Alt. 5, lat. 2 :; / t ; apert. alt. (with canal) 2, lat. i 3 / 4 Mill. 



A not quite developed specimen is a little larger (length 5 1 /., Mill.). 



71 



