310 THE VOYAGE OF H.M.S. CHALLENGER 



40. Pleurotoma (Drillia) spadix, 1 n. sp. (PI. XXVI. fig. 6). 



Station 163B. June 3, 1874 Lat. 33° 51' 15" S., long. 151° 22' 15" E. Port Jackson, 

 Sydney. 35 fathoms. Hard ground. 



Shell. — Small, strong, narrow, palish chestnut, tubercled, spiralled, with a small last 

 whorl, a short base, a small snout, a high spire, and a small blunt glossy apex. Sculpture: 

 Longitudinals — there are very numerous fine hair-like lines of growth ; a little below the 

 middle of each whorl is a row of elongated bifid white tubercles. Spirals — at the peri- 

 phery the shell is bluntly angulated by a double rounded thread on which the white tubercles 

 occur ; below this are 7 broadish flat threads parted by rather broader shallow intervals in 

 each of which are 2 or 3 very fine flat threadlets ; these extend to the snout, but the 

 threads there are stronger than the fine and weaker than the strong threads above, they 

 are also less regular ; similar to these last, but more regular, are the threads on the shoulder 

 above the periphery. Colour a suffused pale chesnut, paler on the outer lip and at the 

 top of the mouth, and white on the tubercles. Spire high, narrow, conical. Apex blunt, 

 small, brilliant, consisting of 2f embryonic whorls. Whorls 7^ in all ; they are sub- 

 angulated below the middle, a little high ; the last is small, with a conical lop-sided 

 base and no definite snout, obliquely truncate but hardly reverted at the point. Suture 

 fairly distinct, oblique. Mouth oblique, oblong, of nearly the same breadth from above to 

 the point of the canal. Outer lip strengthened externally by a broadish, rather remote 

 varix, from which the edge is bevelled off regularly ; the sinus is U-shaped, deepish but 

 broad ; it lies at the top of the mouth, but is separated from'the suture by a little, irregular, 

 strong, slightly ascending shelf ; below the sinus the lip-edge sweeps forward and then 

 advances straight to the point of the shell. Inner lip thick at the corner of the sinus but 

 only a thin glaze below ; it is very short on the body, concave at the base of the pillar, 

 down which it runs direct and oblique, without any cutting off or twisting of the edge, to 

 the small sharp pillar-point. H. 0'45 in. B. 0'17. Penultimate whorl, height - 07. 

 Mouth, height 0-18, breadth 0'08. 



41. Pleurotoma (Rhaphitoma) 2 rhysa, 2 Watson (PI. XXI. fig. 2). 



Pleurotoma (Surcula) rhysa, Watson, Prelim. Keport, pt. 8, Journ. Linn. Soc. Lond., vol. xv. p. 400. 

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

 350 fathoms. Eed mud. 



Shell. — High, narrow, conical, with a small apex, a contracted, conical base, and a 

 longish narrow snout ; carinated, ribbed, with spiral threads, pale buff. Sculpture : the 



1 So called from its colour. 



2 This is the Rhaphitoma of Bellardi, not of Sars (Moll. Arct. Norv., p. 218), whose genus of this name is 

 quite different, in that it has spiral threads, but is not longitudinally plicate nor cancellated, while Bellardi's 

 Rhaphitoma is distinctively " longitudinaliter plicata" (see Bellardi, Moll. terz. Piemonte, &c, vol. ii. p. 297). 



3 gunk, wrinkled. 



