MOLLUSCA or THE ' CHALLENGER ' EXPEDITION. 603 



well arched, tliin ou tlie edge, strengthened at a little distance by 

 a Tarix, with 5 or 6 long, narrow, distant teeth within. Inner 

 lip short and straight across the body, where it spreads thinly 

 and indefinitely ; it is angulated at the base of the pillar, which 

 is long and very straight, and has in front 2 or 3 inconspicuous 

 tubercles ; the callus-edge is straight and sharply defined ; and 

 there is a slight umbilical depression in front between it and the 

 cord, which twists round the point of the snout. H. 0"56. B. 0"3. 

 Penultimate whorl, height O'l. Mouth, height 0-36, breadth 0-17. 



This species is not well represented in the specimens brought 

 home. It somewhat resembles our British M. aciculatus, Lam., 

 but is a little larger, shorter, broader, more angulated, and 

 conical. M. Brazieri, Aug., has the upper whorls higher, and 

 the last much more tumid. 



6. Mfrex (Ocinebea) pteehias, n. sp. {-^yppias, red-head.) 



St. 75. July 2, 1878. Lat. 38° 38' N., long. 28° 28' 30" W. 

 Fayal, Azores. 450 to 500 fms. Sand. 



Shell. — Thinnish, white, oblong-fusiform, subscalar, with a 

 moderate spire, a small chestnut-coloured tip, a short rounded 

 base, and a small snout. SctilpUire. Longitudinals — there are 

 no varices ; but somewhat narrow, rounded, tumid ribs, about 

 9 on each whorl, run continuously from the ajDex to the point, 

 but become very slight on the base ; their intervening furrows 

 are broad, shallow, and rounded : the whole surface is scored by 

 very small lamellae, which rise in vaulted scales ; in the minute 

 interstices of these there are very slight puckerings. Spirals — 

 there is an angulation about the middle of the whorls, which on 

 the last is slight; this angulation is marked on the earlier whorls 

 by a spiral tliread, which rises into a little knob on the ribs ; 

 on the last whorl the whole surface (except just below the suture) 

 is covered with close-set equal irregular rounded threads, on 

 which the longitudinal lamellse rise into vaulted scales ; the point 

 of the snout is a twisted cord scored with the old canal-scars. 

 Colour yellowish dead- white, with a ruddy chestnut tip. Spire 

 rather high, conical, subscalar. Apex chestnut, turbinated, small, 

 blunt-pointed, consisting of 3J7 rounded polished whorls, which 

 end with a distinct, prominent, reverted and sinuated edge. 

 Whorls 8 to 9 in all; they are conical and shouldered above, 

 angulated about the middle, below which they are cylindrical ; 

 the last is scarcely angulated, rather small, rounded, with a short 

 contracted base produced into a small equal-sided snout, which 



