317 



curved ribs, about 22 in numbcM- on last wlioi-l, these ribs air iiaiTow, with broader interstices, 

 especialh' on last whorl; they arc; crossed and iciulei-ed sli^iuly ^ranose by spiial lii'ae, about 

 16 in number on last whorl, of which the u|)[)cr one, borderini^ the suture is stronger and 

 separated by a o;roove, thus niakiuL;" the sutures beaded. Aperture oval, with a sinus above; 

 peristome blunt, with a thick, Hat rib externall)', this rib is crossed !))■ tJu; s()iral lirae, internally 

 the peristome has 5 or 6 denticles, of which llu; basal one; lias the; ap[)(;ai'ance of a tooth. 

 Columellar sitle enameled, with a [)lait 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; apcrt. alt. (with canal) 3, lat. i'/. Mill. 



It is not without hesitation that 1 describe this and some of the next species as new. 

 It resembles in many respects JV. collaticia Melvill and N. vmnda 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 N. nmnda the whorls are strongly gradate. 

 I have located the species it the Section Alectryon^ of which Aciculina is according to Cossmann 

 a subsection, on account of its resemblance with A^. collaticia. 



var. brevis n. var. 



Shell more ventricose, consequently relatively shorter. 



Alt. 7, lat. 4; apert. alt. (with canal) 3Y2, lat. lYo Mill. 



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

 of N. munda^ sporadica^ stiphra and latJu^aica^ I have been able to satisfy myself, that these 

 species are different from my new ones. 



18. Nassa (Alectryon, Aciculina) macrocephala n. sp. PI. XX, fig. 2. 



Stat. 114. Kwandang-bay-entrance. 75 M. Hard sand very fine. 7 Spec. 



Stat. 116. 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 broad, 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, Urate towards 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 few 

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



Alt. 5, lat. 2^1 -, apert. alt. (with canal) 2, lat. 1^4 Mill. 



A not quite developed specimen is a little larger (length 5Y2 Mill.). 



71 



