99 



which, as in Voluta^ opens into the floor of the buccal mass in 

 front of the odontophore. 



The radula of Volutililhcs exhibits three teeth in each transverse 

 row. Of these rows there are about no, l)ut owing to the small 

 size of the teeth the radula is small and delicate. The central 

 tooth is tricuspid, the laterals unicuspid. 



For further remarks upon this interesting niollusk see Proc. 

 Malac- Soc. vol- iv. pp. 122-124. 



Conchologically, this genus is very closely related to I'olnta. 

 The tricuspid rhachidian tooth is similar to that of most of the 

 Voliitidac (as far as known), which, however, unlike this, have no 

 laterals. Having regard to this difference, and to certain differ- 

 ences in the anatomy, the propriety of retaining Vohiiilithcs as a 

 genus distinct from J''oIiifa is established, and Mr. Woodward 

 even suggests a doubt as to whether it may not be regarded as 

 representing a family apart from the VolufiJae- 



\'oLi"TiLiTHES GiLCHRiSTi, n. sp. (Plate IT., fig. 5). Shell ob- 

 long ovate, yellowish white, surface cancellated; spire rather 

 shortly conical; whorls rather convex, longitudinally ribbed, and 

 spirally lirate, separated by a deeply channelled suture, above 

 which the top of the Avhorl projects in an acute crenulated ridge; 

 last whorl about two-thirds the entire length of the shell, convex, 

 and but slightly attenuated towards the base, with;a narrovvi^h 

 concave depression a little l^elow the sutural ridge; longitudinal 

 ribs about 16, elevated at ihc suture, and gradually becoming 

 obsolete towards the base; spiral lirre rather narrow, becoming 

 stouter towards the base. Aperture narrowly oblong; columella 

 covered with a thick callus; plicae 6, very small and faint, the 

 anterior one heino^ more proniinen*^! than the rest, oblique, ihin and 

 sharp; outer lip very thick, smooth and rounded, forming on the 

 exterior a broad, stout border to the whorl, as in tlie genus 

 MarciiiicUa. 



Length 30; breadth 15 millim. 



Hab. : — Cape Natal W. by N., distant 11 miles. Depth, 200 fms. 



Plkurotoma Gilciiristi, n. sp. (Plate II. fig, 9). Shell elon- 

 gately fusiform, posterior longer than the anterior, whitish tinged, 

 and banded with pale yellow- Spire elongately turreted, slightly 

 convex at the sides, acute at the apex; whorls 12, apical ones 

 smooth, rounded, regular, the rest sloping, scarcely convex, with 

 a double keel above, beneath which is a deepish rut, and about 

 the middle of the whorl a stouter keel ornamented with rather 

 close-set. gem-like tubercles, the interstices between the keels 

 being ridged and grooved ; suture of the upper whorls trans- 

 versely plicate, and of the lower narrowly canaliculate. Last 

 whorl rather convex with the tubercles, becoming longitudinallv 

 narrower, and the keel bearing them less prominent, beneath 

 which there arc several -jcute keels and interveniuGf lirnc ; the 



