REPORT ON THE GASTEROPODA. 441 



Inner lip : pure white, oblique, direct, with a Hattish, slightly patulous face, behind which 

 it has an obsolete furrow and a ridge on the edge ; it is joined above to the outer lip by a 

 thin, slightly expanded callus ; below this, where it leaves the body-whorl, it is deeply 

 hollowed but strong ; lower still it is greatly thickened and expanded by the junction to 

 it of the umbilical callus ; at the point of the pillar it is thick and patulous. Umbilicus : 

 the upper part is small, but open and pervious ; the lower part of it is choked by a 

 strong ivory-white twisted callus, below which is a distinct but shallow furrow forming the 

 upper side of the slight, broad cord, which faintly defines the umbilicus ; there are no 

 intra-umbilical ridges or furrows to speak of. H. 1*17 in. B. 1. Penultimate whorl, 

 height 0-25. Mouth, height 0'93, breadth 0*57. 



This fine species somewhat resembles Natica tceniata, Menke, but is higher spired and wider 

 mouthed ; the colouring, too, is different. Natica articulata, Phil., which has a more raised spire, is 

 a more elongated shell, with a more oblique suture ; in it, too, the colouring is different. This species 

 reached me at so late a period that I had no opportunity of comparing it with the specimens 

 preserved in the British Museum, but Mr E. A. Smith, who kindly compared it for me, assures me 

 that it is different from any species there represented. 



13. Natica leptalea, 1 Watson (PL XXVII. fig. 7). 



Natica leptalea, Watson, Prelim. Report, pt. 7, Journ. Linn. Soc. Lond., vol. xv. p. 261. 

 Station 23. March 15, 1873. Lat. 18° 24' K"., long. 63° 28' W. Off Sombrero Island, 

 St Thomas, Danish West Indies. 450 fathoms. Pteropod ooze. 



Shell. — Delicate, depressedly globose ; spire slightly scalar, but with a flat round apex, 

 thin, smooth and glossy, ivory-white, umbilicated. Sculpture: Longitudinals — very 

 delicate hair-like lines of growth. Spirals — the whole surface is covered with very faint, 

 minute, and superficial lines and furrows, complicated with sharper wavy microscopic 

 scratches ; the two so run into one another that it is difficult to say how far they are 

 distinct, only they are so. Colour uniform ivory-white. Epidermis : none visible. 

 Spire rises in a series of rounded steps from the inferior whorls. Apex large, but 

 depressedly rounded. Whorls 4^ ; the first 1^ are embryonic, tumid, and equably 

 rounded, of rather rapid increase. Suture very little oblique, slightly channelled. Mouth 

 very oblique, roundly oval to circular, with a flattening of the left side ; its height is 

 rather more than five-sevenths of the whole height. Outer lip open and well rounded 

 throughout its whole sweep ; its edge is thin. Inner lip is flatly curved ; it spreads 

 thinly across the body, is thinly reverted on the umbilicus, which it narrows but does 

 not close, retreating at this point gradually to the pillar, where it is slightly nicked by the 

 intraumbilical furrow ; below this it is a little thickened and reverted throughout the 

 length of the pillar. Umbilicus, which is small and funnel-shaped at its mouth, is not 



1 \iKra~Aioi, delicate. 



(ZOOL. CHALL. EXP. — PART XLII. — 1885.) Tt 5G 



