REPORT ON THE GASTEROPODA. 341 



71. Pleurotoma (Mangelia) eritmeta, 1 Watson (PI. XXIII. fig. 5). 



Pleurotoma {Mangelia) eritmeta, Watson, Prelim. Report, pt. 9, Journ. Linn. Soc. Lond., vol. xv. p. 432. 



Station 75. July 2, 1873. Lat. 38° 38' N., long. 28° 28' 30" W. Off Fayal, Azores. 

 450 fathoms. Volcanic mud. 



Shell. — Small, rather narrow, biconical, continuously ribbed, microscopically spirally 

 striated, with a very blunt tip, a rather fine but expressed labral varix, and a very slight 

 shallow sinus which does not cut through the lip. Sculpture: Longitudinals — there are 

 eight narrow, rounded, prominent, direct, very slightly oblique ribs, which run continu- 

 ously from apex to point of base ; there are also very faint scratches in the lines of growth. 

 Spirals — the whole surface is very delicately fretted with microscopic, regular, sharpish 

 spiral stria?. Colour warm yellowish-white, with a ruddy band below the suture. Spire 

 regularly conical. Apex consists of rounded, glo'bose, smooth whorls, of which the tip is 

 broken. Whorls 6 remaining, of regular but rather rapid increase, rather high and narrow, 

 just perceptibly convex ; the last is small, very little tumid, with a short, conical, lop-sided 

 base, ending in a very short, flatfish snout, crossed by the longitudinal ribs. Suture linear, 

 scarcely impressed. Mouth very small and narrow, with almost parallel sides, contracted 

 above into a small narrow sinus, which cuts only half-way through the thick outer lip ; the 

 canal in front is deep, turning in behind the pillar ; it is nearly as broad as the mouth, 

 and is abruptly cut off in front. Outer lip very slightly convex, a very little inflected, 

 thick, with a very small projecting sharp inner edge and a prominent narrow pinched-in 

 external varix, which extends to the extreme point but not round the snout ; it is half cut 

 through at the very top by the sinus, which, however, does not show itself on the front of 

 the lip ; but at this point the whole lip-edge retreats a little and rises slightly on the body- 

 whorl. Inner lip : there is a minute pad at the top ; but all the rest of it is very thin : 

 in its direction it is a very little oblique ; its edge in front is narrow, rounded, and very 

 slightly twisted. H. 0'194 iu. B. 0-087. Penultimate whorl, height 0*039. Mouth, 

 height 0-09, breadth 0"025. 



This species somewhat resembles both Pleurotoma turgidula, Forbes (=nana, Scacchi), and Pleuro- 

 toma septangularis, Mont. ; but is slimmer than either of these, the suture is less impressed, and the 

 ribs are much more regular, more continuous, and less tumid in breadth and prominence ; the spiral 

 sculpture, too, is very much finer, the lines and furrows being much more minute ; the mouth, too, 

 is much smaller and narrower, and has not the convex outer lip. 



72. Pleurotoma [Mangelia) hypsela? Watson (PI. XXI. fig. 4). 



Pleurotoma (Mangelia) hypsela, Watson, Prelim. Report, pt. 9, Journ. Linn. Soc. Lond., vol. xv. p. 433. 



Station 122. September 10, 1873. Lat. 9° 5' S., long. 34° 50' W. Off Pernambuco. 

 350 fathoms. Red mud. 



1 hirpnro;, well cut. t i^Xog, high. 



