smooth, with only a few irregular impressed striae, suture very deep; the whole shell is crossed 

 by white ribs, the majority of which is rather thin, slightly lamellose towards the upper part 

 of each whorl, but forming no spines; under a strong lens the ribs are finely crenulate at their 

 anterior side ; a few of the ribs are stronger, forming varices at irregular intervals, one borderino- 

 the aperture, but also the preceding rib is thickened; the number of ribs is 29 on the last 

 whorl. Aperture oval, with a thick, continuous, white lip, slightly refiected over, but not closing 

 the umbilicus. Interior of aperture flesh-coloured, white towards the margin. 



Alt. 8 8 / 4 , lat. 4 1 /,; apert. alt. 3, lat. 2 1 /. MUI. 



This fine species may be allied to 5. clementina Grat., and bulbulus Sow. but is more 

 elongate and easily recognized by its violaceous colour. 



8. Scala fragilissima n. sp. PI. XV, fig. 3. 



Stat. 17S. 2°4o'S., I23°37'.5E. Ceram Sea. S35 M. Blue mud. 2 Spec. 



Shell subperforate, pyramidal, very thin, transparent, yellowish-white, nucleus wanting, 

 remaining whorls probably 7 or 8 (both specimens incomplete), very convex, obtusely angular 

 a little above the periphery, with a very deep suture ; sculpture consisting of spiral ribs, about 

 1 5 in number on the penultimate whorl, and thin, undulating ribs, crossing the spirals and 

 giving a cancellated appearance to the shell ; these radiating ribs are, if well preserved, delicately 

 spinose at the upper part and their crest as well as the whole rib is undulated, these undulations 

 corresponding to the spiral ribs; the ribs are subequal, becoming only a little stronger with 

 age, their number is about 23 on the last whorl, which is slightly angular, but has no basal 

 rib. Aperture incomplete, probably nearly circular, only faintly angular above, its right margin 

 thin (youngr), its columellar margin slightly refiected over and nearly covering the umbilicus, 

 which in the largest specimen is still circumscribed by a thin rim. 



Alt. (of largest specimen) g 7 / K , lat. 3 3 / 4 ; apert. lat. 2 MUI. 



Though the specimens are rather incomplete, I think they are characteristic enough, to 

 deserve a name and description ; they resemble in shape 5". formosissima, from the Azores, but 

 have still much more convex whorls and much finer and more elaborate sculpture; in this respect 

 they resemble 5. undulatissima Sow., but that species is only very minutely spirally striate and 

 much broader in proportion to its length. 



9. Scala (Clathrus) pnlchcrrima Sowerby. 



SOWERBY. Proc. Zool. Soc. Lond. 1S44. 

 Reeve. Conch. Ie. Vol. XIX, Scalaria, fig. 67 (Spec. 68). 

 Tryon. Man. of Conch. Vol. IX, p. 68, PI. 14, fig. 32. 



CLESSIN. Martini-Chemn. Conch. Cab. Ed. II, Vol. II, Scalaria, p. 34, PI. 10, fig. 11 (figured 

 as catanuensis). 



Stat. 51. Madura-bay. 69 — 91 M. Fine grey sand, coarse sand with shells and stones. 1 Spec. 



As stated by Tryon, the figure and description of Reeve don't correspond; the figures 

 ol 5. pulcherrima and S. catanuensis having been changed on the plate. Clessin, whose 



117 



