REPORT ON THE GASTEROPODA. 261 



obliquely. Colour rich buff, thinly overlaid with a whitish glaze ; this for some distance 

 below the suture is covered with a dullish buff enamel. Spire high, conical, subsealar. 

 Apex small and sharp, being originally mamillated, but subsequently eroded and enamelled. 

 Whorls 7 to 8, at the top very slightly shouldered and angulated, then flatly convex. 

 Suture oblique, completely buried in a thick coat of glaze which fills the sutural angle, 

 and which embraces the whole apex. Mouth large, pear-shaped, with a shallow, broad, 

 obliquely truncated canal in front. Outer lip thin and rounded on the edge ; it is cut off 

 from the body by a strongly marked sinus, below which it advances prominently into a 

 rounded angle, retreating slightly, but steadily, from this point throughout its whole 

 course ; it is straight and slightly contracted above, roundly angulated and patulous below 

 the middle, straight and patulous and cut off backwards from this point to the edge of the 

 canal. Inner lip scarcely convex above, little concave in the middle, direct with a very 

 slight twist and no swelling below ; near the edge are two narrow, slight, white, very 

 oblique teeth, of which the upper is sometimes absent : the narrow sharp lamina of the 

 pillar-edge in front is the extreme point of the shell. H. 3"6 in. B. VS. Penultimate 

 whorl, height 0-8. Mouth, height 2, breadth 0*95. 



This is au extremely peculiar form of great beauty. It is higher and narrower than the measure- 

 ments would suggest, the outthrow of the outer lip being great, but of short continuance. It has a 

 strong general resemblance to Ancillaria glahrata, Linne, or Ancillaria verncdei, Sow., or other smaller 

 species of that form, of which it simulates the subperipheral band. In Valuta pallida, Gray, some of 

 the peculiar features of this species — such as the sutural sinus, the enamelled spire, and the outthrow 

 of the outer lip at its lower corner — are found, though in a much feebler form. 



The swelling on the pillar which is characteristic of the Volutes, and is really the scar of the old 

 columellar sinus, is in this species quite absent in front, but is just recognisable on the back of the 

 shell in the flexure of the lines of growth. 



3. Guivillea, Watson, 1881. 

 Wi/villea, 1 Watson, Prelim. Report, pt. 12, Journ. Linn. Soc. Lond., vol. xvi. p. 332. 



Animal a typical Volute. 



Shell ovate, cymbiform, thin, rough ; spire high, scalar ; apex mamillate and irregular ; 

 suture canaliculate ; mouth large, ovate ; inner lip with a widespread thinnish callus ; 

 pillar perpendicular, with a very slight turn ; it has no teeth, but an abrupt break of the 

 edge about the middle of its length. 



1 This generic appellation, derived from the middle name of Sir C. Wyville Thomson, proves to have been 

 preoccupied in 18S0 by Mr Haswell for a genus of Amphipodous Crustaceans, published in the Proceedings of 

 the Linnean Society of New Soidh Wales, vol. iv. p. 336. In these circumstances, I have made the least possible 

 change, and retained the association of the word by falling back on the older form of my friend's name. 



