150 



f ormly concave between the angulations ; with axial costae, 

 valid, rounded nearly as wide as the interspaces, and spiral 

 lirae, wider anteriorly, wider than their interspaces, crossing 

 the costae, six above the angulation, and two below it ; fine 

 accremental striae under the lens. Suture distinct, linear, 

 undulating, convex between the costas. Body-whorl oblong 

 with two median rounded carinse, the upper larger, more 

 prominent, forming the angulation (in the spire whorls), the 

 lower producing the upper margin of the suture, tubercu- 

 lated by the axial costte, which cease at the lower one; six 

 spiral lirae above them^ two between them, and ten of vary- 

 ing size below them on the concave base. Aperture subtri- 

 angular, outer side straight, inner sigmoid. Outer lip thin, 

 slightly excavated just below the suture for one-sixth of its 

 extent to form a shallow sulcus, with a margin feebly thick- 

 ened and everted, then excavated again to the upper carina, 

 an acute short projection between the two excavations; edge 

 crenulated by spiral lirae and carinse. Basal lip begins at the 

 lower carina and is concavo-convex to the anterior notch. 

 Columella concavo-convex from behind forwards. 



Dt'inensions. — Length, 9'1 mm. ; width. 2 '7 mm. ; aper- 

 ture, 2*8 mm. ; body-whorl, 4'8 mm. 



Locality of type, St. Vincent Gulf, 22 fathoms with 6 

 other examples, 100 fathoms off Beachport, one broken, 110 

 fathoms 6, 130 fathoms off Cape Jaffa, 2 broken. 



Ornament. — The type is white, but a co-type shows a 

 brown tinting of the two carinae and of that part of the axial 

 costae connecting them, most marked at the tubercles of junc- 

 tion. This shell is lO'l mm. long, and shows fifteen spiral 

 lirae at the base. 



Ohsei-vat'wnii. — The living mollusc has not been taken, so 

 the radula and the operculum (if any) are not known. Its 

 generic position is very doubtful, and even its family is ques- 

 tionable. Some conchologists who have seen it refer it with 

 doubt to the Terehriche, and propose the creation of a new 

 genus for its reception. Its infra-sutural sulcus, barely 

 thickened at the margin, suggests rh'^irotom'idce, but it is diffi- 

 cult to find a genus for it here. 



Explanation of Plate IV. 



1, 2, Operculum of Scala morchi, Angas. 

 3, 4, 5, ? Tcrehra dyscritos. 



6, Scala platypleura, n. sp., Vevco. 



7, ,, vaUda, n. sp., Verco. 



8, ,, acanthopleura, n. sp., Verco. 



9, 10 ,, invalida, n. sp., Verco. 



11, CincjuUna diaphana, n. sp., Verco. 



