REPOKT ON THE GASTEROPODA. 319 



somewliat of an intermediate place. Than Plcurotoma sclysii it is stumpier in the spire, shorter in 

 the pillar, and, especially in the upper whorls, more angulated. Than Plcurotoma nodulosa it is 

 much larger, each whorl is much higher, the body-whorl is much longer and narrower, and, especially 

 in the young shell, is much more contracted in the base. 



49. Plcurotoma (Typhlomangclia) fluctuosa, Watson (PI. XXV. fig. 4). 



Pleurotoma (Drillia) fluctuosa, Wats'on, Prelim. Report, pt. 9, Journ. Linn. Soc. Lond., vol. xv. 



p. 416. 



Station 151. February 7, 1874. Lat. 52° 59' 30" S., long. 73° 33' 30" E. Heard 

 Island. 75 fathoms. Volcanic mud. 



Var. cariosa, Watson. 



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

 Kerguelen. 28 fathoms. Volcanic mud. 



Shell. — High, broadish, conical, with a shortish conical base, a slight angulation near 

 the top of the whorls, very oblique ribs, rather thin, white. Sculpture : Longitudinals — 

 below the sinus-area narrow, close-set ribs make their appearance so abruptly as almost to 

 count for tubercles ; they bend very obliquely * to the left, and correspond with the lines 

 of growth with which the surface is closely puckered ; on the base they coalesce and 

 become faint, disappearing wholly on the snout. There are twenty-three on the last 

 whorl ; in number, but hardly in size, they diminish up the spire rapidly ; the hollows 

 between them are about as broad as the ribs. Spirals — in the sinus-area, and between 

 the ribs where the epidermis is preserved, there are fine, sharp, close-set, minute, hair-like 

 threads, somewhat fretted by the lines of growth ; on the summit of the ribs these also 

 appear, reticulating the surface, but are less distinct ; below the sinus-area there is an 

 angulation arising almost entirely from the prominence of the rib-ends. Colour dull por- 

 cellanous white below the pale yellowish-grey epidermis, which is easily rubbed off all the 

 prominent parts of the shell. Sjnre conical, but with its profile-lines much broken by the 

 contraction at the sutures ; its ujDper part is small and rather cylindrical. Apex globose, 

 round, comprising two embryonic whorls, the extreme tip of which is somewhat obliquely 

 flattened down. Wliorls 8 to 9, rather short, the last a little ventricose ; between the 

 suture and the angulation they are a little hollowed ; below the angulation the profile- 

 line is convex with a slight contraction into the suture, so that the breadth at the angula- 

 tion and at the suture is equal. The last whorl contracts rather rapidly on the slightly 

 convex base into a short conical snout, which on the right is so obliquely truncated that 

 it hardly projects, the curve of the outer lip passing on almost without interruption to the 

 point of the pillar. Suture distinct, both from the curve of the whorls and from being 

 itself a little impressed. Mouth obliquely oval, pointed above, and with a short broad canal 



1 This does not appear in the figure. 



