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



16. Utriculus (Tornatina) avenarius, 1 Watson (PI. XLIX. fig. 5). 



Utrimlus (Tornatina) avenarius, Watson, Prelim. Report, pt. 20, Journ. Linn.] Soc. Lond., voL xvii. 



p. 328. 



April 17, 1874. Port Jackson, Sydney. 2 to 10 fathoms. 



Shell— Oval, rounded bluntly in front and sharply above where the papillary apex 

 projects, smooth, angulated above round the outside of the channelled suture, with a 

 strongly toothed twisted oblique pillar, and a smallish mouth, which is shorter than 

 the shell. Sculpture: Longitudinals — there are faint rounded furrows on the lines of 

 growth. Spirals— on the upper part of all the whorls there seem to be close-set very faint 

 spirals; about the middle of the whorl they become stronger, like very fine remote 

 furrows ; a bluntly angulated keel projects axially below the suture. Colour translucent 

 white. Mouth a good deal shorter than the shell, conically clavate, slightly curved, a little 

 blunt at 'the top. Whorls 4 to 4^, angulated above ; each rises distinctly above the one 

 which follows. Outer lip almost appressed above, but separated by the deep sutural 

 channel which runs into the top of the mouth : in front it is very patulous, and obliquely 

 truncate backwards, in the middle it is slightly contracted. Top : the whole upper part 

 of the shell contracts, and the spire is roundly conical and subscalar, with the glossy round 

 papillary apex rising slightly above all : it is scored with the sutural canal, which is narrow 

 and not deep, but well defined by the sharp keel which lies below it. Inner lip : there is 

 a thick prominent labial pad ; the curve of the body is convex, and so passes on regularly 

 to the point of the pillar, which is very oblique and carries a strong, twisted, oblique, 

 longitudinally furrowed tooth ; between this tooth and the body is a very small furrow. 

 H. 0"22 in. B. 0*1. Mouth, breadth at same place, 0"02. 



This species a good deal resembles, not the Bulla turrita, MolL, but Sowerby's figure of that 

 species in the Thesaurus, pt. 11, pi. cxxi. fig. 28. In perfectly fresh specimens the spiral furrows, which 

 I have described as very faint, may be distinct ; but in the ten Challenger specimens they are only 

 traceable with certainty near the edge of the labial pad. Utriculus carialiculatus (Say), is a much 

 smaller and stumpier form, much broader above, with a minute apex turned over on its side. 



17. Utriculus (Tornatina) aratus, Watson (PI. XLIX. fig. 6). 



Utriculus (Tornatina) aratus, Watson, Prelim. Report, pt. 20, Journ. 'Linn. Soc. Lond., vol. xvii. 



p. 329. 



Station 188. September 10, 1874. Lat. 9° 59' S., long. 139° 42' E. West of Cape 

 York, off south-west point of Papua. 28 fathoms. Green mud. 



Shell. — Small, oblong, truncated at the top, rounded in front but not truncated, with 

 whorls sharply angulated above and furrowed spirally from end* to end, 2 a channelled 

 1 So called from its having somewhat the appearance of a grain of oats. - Hence the name. 



