MOIiLUSCA or THE ' CHALLENGEE ' EXPEDITION. 291 



prominent. Whorls 5, subcylindrical, slightly convex, the pen- 

 ultimate is rather high. Suture canaliculate and submarginated. 

 Mouth large, the teeth being small, suboblique. Outer Up some- 

 what obliquely drawn iu and. produced on the base, where it 

 is round, patulous, and slightly sinuated ; about the middle it 

 is prominent and toothed ; above it is narrowly and shaliowly 

 sinuated close to the body. Inner lip rather thinly and narrowly 

 thickened, with a small tooth iu the middle ; the two pillar-teeth 

 are oblique, parallel, and nearly equal, the lower being the larger. 

 H. 0-067. B. 0-038. Mouth, height 0-034, breadth 0-027. 



This species resembles M. Goujoni, de Eolin, more than any I 

 know; but the shell is shorter here, with a lower spire and a 

 less esserted tip. The suture in that species is very much less 

 canaliculate, the mouth is smaller, and the spirals are much less 

 numerous and are more remote. 



2. ElNGICULA ASSULAETTM, U. Sp.* 



September 8, 1874. Flinders Passage, Torres Straits. 7 fms. 



Shell. — Small, somewhat lozenge-shaped, the left slope of the 

 spire and the right base, the right slope of the spire and the left 

 base being roughly parallel, smooth and without spiral furrows, 

 with an obtuse spire, a small but blunt apex, and a mouth much 

 contracted by the callus of the lips. Sculptu,re. Longitudinals — 

 there are very slight rounded lines of growth. Spirals — none, 

 except one feeble furrow toward the front of the base. Colour 

 glossy white, with a faint bluish tinge. Sp)ire short, conical, very 

 slightly subscalar. Apex very small, rounded, prominent, and 

 a little elevated on one side. Whorls 5, couical, convex; the 

 first, which is very small, is a little depressed, but at its origin 

 stands up prominent on one side ; the last, viewed as the shell 

 lies on its face, is two thirds of the whole length. Suture 

 strongly marked, but not impressed, nor canaliculate nor margi- 

 nated. Mouth small, oblique, very much narrowed by the teeth 

 of both lips. Outer lip very much thickened, with a large 

 prominent blunt tooth on the inner side above the middle : 

 there is a shallow sinus above at the junction of the lip with the 

 body, and a very small one at the point of the pillar. Inner lip : 

 there is a thick toothed pad on the body ; of the two pillar-teeth 



* Pace Captain Flinders, I have allowed myself to borrow from Plautus's ren- 

 dering "facere assulas foribus" of our idiomatic English phrase, "to knock the 

 door in flinders." 



