MOLLUSCA OP THE ' CHALLENGEB ' EXPEDITION. 387 



the vaulted spikes present a canal ; it is patulous l)elow and down 

 the whole anterior canal. Inner lip rounded above, where it ex- 

 pands on the body, joining the outer lip without any angulation ; 

 at the top of the canal it projects in a slight blunt tooth ; from 

 this point it becomes much narrower, and only the excessively nar- 

 row edge of the glaze can be recognized, almost hiding behind the 

 long straight pillar. H. 1-5. E, (exclusive of the spines) 0*64i. 

 Penultimate whorl, height 0-22. Mouth, height 1, breadth 0-32. 

 This species resembles T. vaginatus, Jan, but is much more 

 tumid on the base, is more constricted at the anterior canal, has a 

 straighter snout, a less contracted suture, and a lower spire. 



2. Teophon caeduelts *, n. sp. 



St. 164 B. June 13, 1873. Lat. 34'' 13' S., long. 151° 38' E. 

 Off Sydney. 410 fms. Grey ooze. 



Shell. — Thin, porcellaneous white, fusiform, with a bigh scalar 

 spire, very small apex, long, small snout, angulated whorls, scored 

 by thin, sharp, procumbent lamellae rising on the keel into high 

 vaulted spikes. Sculpture. Longitudinals — there are on eacb whorl 

 9 or 10 thin, sharp, vaulted, and procumbent lamellae, the old lip- 

 edges; they are pretty prominent, cross the whole whorls, are 

 obliquely continuous from whorl to whorl, rise on the upper part of 

 the whorls into hollow, vavdted, upturned, and reverted spikes, and 

 are traceable to the point of the snout ; between these lamellae are 

 slight lines of growth. Spirals — above the middle of each whorl 

 there is an angulation, the effect of which is greatly increased by 

 the coronal of spikes which project at tbis point ; one or two very 

 depressed rounded threads, parted by minute linear furrows, 

 are also found on this angulation; similar but feebler and very irre- 

 gular threads and furrows cover the rest of the surface. Colour 

 porcellaneous white, with a smooth but not polished surface. Spire 

 high, scalar. Apex small, consisting of two smooth rounded, 

 globose, embryonic whorls, the extreme tip of which is very small 

 and is slightly turned over and immersed. Whorls about 10, 

 flatly sloping above, angulated and coronated, conically con- 

 tracted to tbe lower suture ; they are all small but the last, which 

 is slightly tumid, with a rounded and shortly produced base pro- 



* I have failed to approach the idea of " thistly " nearer than by this, the name 

 of the Thistle-Finch, which really ought to have had the same latitude as its 

 Greek equivalent ciKarOi^. The prickles on this species of TropJwn recall 

 strongly those of the involucre of some thistles. 



LINN. JOUBN. — ZOOLOGT, YOL. XVI. 27 



