s 



EEPORT ON THE GASTEEOPODA. 145 



11. Scalaria (Acirsa) pyrrhids, 1 n. sp. (PI. IX. fig. 7). 



Station 24. March 25, 1873. Lat. 18° 38' 30" N., long. 65° 5' 30" W. Off Culebra 

 Island, "West Indies. 390 fathoms. Pteropod ooze. 



Shell. — Small, short, thin, with few openly and finely reticulated rounded whorls, a 

 deep suture, a ruddy -brown longitudinally-ribbed apex, and a largish mouth. Sculpture : 

 There are on each whorl about eleven very oblique procumbent lamellae, which twist round 

 the spire from left to right ; they become mere threads on the base. Spirals — four unequal 

 and unequally separated rounded threads occupy the middle of each whorl ; the two 

 highest coincide with a prickle-like projection of the longitudinal lamellae ; the upper 

 part of the whorl above this is bare, as is also the lower part of each whorl ; the 

 base is also without spirals, but is encircled by one running on from the insertion of 

 the lip. Colour white. Spire rather short, conical. Apex consists of five conical, 

 slightly convex, longitudinally ribbed whorls, which are of a chestnut colour. 2 Wliorh 

 4, besides those of the apex, rounded. Suture deeply constricted, rather oblique. Mouth 

 not small. Outer lip badly broken. Inner lip reverted, with a very small umbilical 

 depression behind it. H. 019 iu. B. 0-078. Mouth, height 0-055, breadth 0-05. 



2. Crossed, A. Adams, 1865. 



Crossea stridtd, Watson (PL IX. fig. 8). 



Crossea striata, "Watson, Prelim. Eeport, pt. 15, Journ. Linn. Soc. Lond., voL xvi. p. 609. 



Station 187. September 9, 1874. Lat. 10° 36' S., long. 141° 55' E. Near Cape 

 York, North Australia. 6 fathoms. Coral mud. 



Shell. — Very small, white, turbinate, spirally striated, with a sub-scalar spire, a minute 

 rounded apex, tumid last whorl, and a small strongly bordered umbilicus. Sculpture : 

 Longitudinals — there are microscopic lines of growth which gather into puckers below the 

 suture. Spirals — there are furrows broadish and square-cut, parted by flat raised surfaces 

 of about twice their breadth ; these extend to below the periphery, but not to the base, 

 the most of which is smooth ; round the umbilicus is a high raised thread, which relatively 

 to the size of the shell is enormous. Colour porcellanous white. Spire raised, subscalar. 

 Apex very small, tabulated, with the extreme tip just visible. Whorls 4, well rounded, a 

 very little tabulated below the suture; the last is tumid. Suture strongly marked, but 

 hardly impressed. Mouth round, but a little gibbous, bluntly pointed above. Outer lip 

 scarcely patulous, well arched, thin. Inner lip regularly curved from the corner of the 

 mouth to the point of the pillar, which is arched, with a thin inner edge parting the mouth 



1 xveclae, red head. 2 Hence the name. 



(ZOOL. CHALL. EXP. — PART XLII. — 1885.) Tt 19 



