292 



they are however still visible below the suture, but disappear at the periphery or a little .below 

 it; these ribs are crossed by much less conspicuous spiral lirae, of which 3 on each whorl are 

 more prominent, with numerous unequal, fainter and intermediate spiral striae, which cross the 

 growth-striae and give under the lens a cancellated appearance to the whole shell. Aperture 

 oval, nearly rounded above, with a very obtuse angle; columellar side with a porcellaneous 

 layer of enamel, which is rather thick, but quite appressed on the body-whorl ; at its upper 

 part I see a faint rib, too faint to make the upper angle channelled ; basal canal rather wide, 

 curved first to the left, then to the right; peristome simple, with very faint crenulations, corres- 

 ponding to the external spirals, smooth within. The whole shell is of a dull white colour externally, 

 the aperture is porcellaneous. 



Operculum typical, rather dark corneous, with basal nucleus. 



Alt. 44, lat. 17; apert. alt. (with canal) 23, lat. 7^3 Mill. 



The radula has a median tooth (M) with 3 short cusps at a squarely oval base, the 

 laterals (i) have a broad base, strongly curved up at the distal extremity, with normally 6 cusps, 

 of which the proximal one is very small, the other ones are subequal ; I see however in many 

 rows, small intermediate cusps, which however seem to be abnormal, as is shown by the figure 

 of two opposite laterals of the same row, the left figure having 2 small intermediate cusps. 



This species has a superficial resemblance with the preceding one, but is quite different 

 by its particulars of sculpture, the spirals not being compressed as in that species, the ribs are 

 more numerous, the canal is much shorter and much more curved, the aperture is smooth, the 

 shell, though fresh, is quite white etc. ; the median tooth of the radula is also different, more 

 so than the laterals. I have named it after Prof. Thiele in acknowledgement of his assistance 

 in procuring materials for comparison. 



6. Fustis brevicaudahis n. sp. PI. XIX, fig. 3. 



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



Shell fusiform, with long, conical spire and short, curved canal. Apex eroded, whorls 

 about 8, convex, with strongly impressed suture. Sculpture consisting of rounded, concentric 

 ribs with rather narrow interstices, the ribs elegantly curved, especially below the sutures, 14 

 in number on penultimate whorl, not surpassing the periphery of last whorl ; they are crossed . 

 by rather broad, flat, spiral ribs on the upper whorls, which are unequal in breadth and become 

 very faint on last whorl, where at least above the periphery, the shell has more the appearance 

 to be superficially grooved; below the periphery the shell is stronger grooved and has about 

 14 flat lirae, alternating with about as broad grooves; the finer sculpture consists of crowded 

 growth-striae; the whole surface seems to be dull white, but is covered by a thin, smooth, 

 yellowish epidermis, with exception of the lower half of last whorl and canal. Aperture oblong- 

 ovate, conspicuously angular above, ending below in a short canal, curved to the left and 

 slightly upturned. Interior of aperture smooth. 



Alt. 35, lat. 12; apert. alt. with canal 16, lat. 6 MiH. 



Alt. 39, lat. 14Y0; apert. alt. with canal 19, lat. 7 Mill. 



46 



