MOLLTJSCA. OP THE ' CHALLENGER ' EXPEDITIOlSr. 287 



front. Inner lip : a thin defined glaze crosses the body and runs 

 direct down the pillar with a straight sharp edge, behind which 

 is a minute chink ; the tooth, which is close up to the body, is 

 very slight and blunt. H. 0'31. B. 0"18. Penultimate whorl, 

 height 0-08. Mouth, height 0-17, breadth O'l. 



This species is represented by only one specimen, of which the 

 outer lip is somewhat broken. The spire is extremely high 

 and scalar. In this respect and in the rounded form of the 

 whorls it somewhat resembles A. {Solidulci) suturalis, A. Ad. ; 

 but the apex is much blunter and the sculpture much finer than 

 in that species. 



4. AcTiEoiT AusTEiNUS, n. sp. 



St. 162. April 2, 1874. Lat. 39° 10' 30" S., long. 146'' 37' E. 

 Off" East Moncoeur Island, Bass Strait, 38 to 40 f ms. Sand. 



Shell. — Small, thin, ovate, strongly striated, with a high conical 

 spire, blunt tip, and tumid body-whorl. Sciolpture. Longitudi- 

 nals — the lines of growth are very faint and somewhat markedly 

 oblique. Spirals — the whole surface is scored with strong equal 

 furrows which are about half the breadth of the interstices : 

 these furrows are not stippled, but are delicately and regu- 

 larly cut across on the lines of growth by fine threads : there 

 are about 20 of these furrows on the body and about 9 on the 

 penultimate whorl. Colour porcellaneous, with a glossy surface. 

 Spire rather high, conical, subscalar. Apex rather large, blunt 

 and flattened, with a very slight inversion of the extreme tip. 

 Whorls nearly 5, very little convex; the last is rather large 

 and somewhat tumid. Suture rather oblique, slight, scarcely im- 

 pressed. Mouth oval, pointed above, a little oblique in its direc- 

 tion. Outer lip sharp and thin, with its edge crenulated by the 

 sculptural spirals ; in direction it is straight above, well curved on 

 the base, where it is very slightly emarginate. Inner Up : very 

 slightly convex on the body, it passes gradually into the short 

 concave pillar, at the base of which there is only the faintest 

 trace of a tooth ; its edge is sharp and patulous, with a minute 

 chink behind it. H. 0-18. B. O'l. Penultimate whorl, height 

 0-06. Mouth, height O'll, breadth 0'07. 



This species slightly resembles A. pusillus, Eorb., from the 

 Mediterranean and North Atlantic ; but the spirals in that spe- 

 cies are stronger and are pit-marked, the suture is much stronger 

 and more channelled, and the body-whorl is more barrel-shaped. 



21* 



