470 THE VOYAGE OF H.M.S. CHALLENGER. 



a suffused yellowish-brown, with small ruddy-brown and white flecks on the upper part 

 of the whorls. The apex is glassy white. The whole shell is rather polished. Spire high 

 and perfectly conical. Apex consists of 1^ small, rounded, slightly tumid and depressed 

 whorls. Whorls 12 (but the shell is not full-grown) ; they are a fittle convex on the side, 

 with a slight gradual rounded contraction into the suture above and below ; but the con- 

 vexity is less on the earlier whorls. The edge of the base is faintly contracted and bluntly 

 angulated; the base is a little convex and but slightly conical. Mouth, &c, not fully 

 developed. The generic sinus on the outer lip is a deep semi-oval. H. 0*44 in. B. - 13, 

 least breadth 0"12. Penultimate whorl, height - 07. Mouth, height 01, breadth 0'08. 



With some resemblance to Turritella 2}hilippensis, this species is much smaller, and differs entirely 

 in sculpture and in the form of the whorls and shape of the apex. 



10. Turritella austrina, Watson (PI. XXIX. fig. 2). 



Turritella austrina, Watson, Prelim. Report, pt. 6, Journ. Linn. Soc. Lond., vol. xv. p. 224. 



Station 144a. December 26, 1873. Lat. 46° 48' S., long. 37° 49' 30" E. Off Marion 

 Island, Prince Edward Island. 50 to 100 fathoms. Volcanic sand. 



Station 149d. January 20, 1874. Lat. 49° 28' S., long. 70° 13' E. Royal Sound, 

 Kerguelen. 28 fathoms. Volcanic mud. 



Shell. — Conical, with rounded whorls basal angle and base, a deeply impressed suture, 

 a fine tapering point, a round mouth, two strong spiral threads on each whorl, and with a 

 very distinct yellow epidermis. Sculpture : Longitudinals — there are many fine, faint, close- 

 set, semicircular lines of growth preserving the curve of the labral sinus. Spirals — there 

 are two strong rounded threads about one-third of the whorl's height apart ; they are nearly 

 equally prominent and angulate the whorls, strongly in the earlier, less so in the later 

 stages of growth. Between these is a shallow open furrow, in the middle of which is a 

 fine narrow thread ; one or two similar threads lie remotely on the upper slope of the 

 whorl, where it contracts gradually into the suture ; one spiral thread of the same kind 

 lies in the open furrow, which abruptly contracts the bottom of the whorl into the suture. 

 The edge of the base is contracted and rounded, with a strong spiral thread which meets 

 the outer lip ; the base is smooth but for the sharp and very strong generic spiral fines 

 which cover the whole surface and are not microscopic, being easily seen with a lens. 

 Colour porcellanous white under the straw-yellow epidermis. Spire high and conical; 

 but its profile lines are deeply interrupted by the strongly contracted sutures. Apex 

 drawn out to a fine, prominent, but rounded and slightly tumid point. Whorls 12, well 

 rounded, with a slight double carination ; the two carinating threads lie nearer the bottom 

 of the whorl ; they are separated by a shallow furrow : beneath the under one the whorl 

 is sharply contracted into the suture, while from the upper keel the whorl slopes by a 



