Ancilla.'} GASTROPODA. -153 



Diameter, 15mm.; height, 29 mm. 



Type in the British Museum. 



Hob. Hauraki Gulf, much more common than the species ; Cook 

 Strait ; Nelson ; west of Cook Strait, Station 167, in 150 fathoms 

 (" Challenger " Exped.). 



Remark. A small form of this variety, 10 mm. by 20mm., which 

 has the central part of the body-whorl light bluish-white, occurs at 

 St. Helier's Bay, Auckland. 



Fossil in the Pliocene. 



2. Ancilla bicolor, Gray, 1847. Plate 46, fig. 20. 



Ancillaria bicolor, Gray, in App. to Jukes' Voy. " Fly," ii, 1847, 357, pi. 1, 

 f. 4. A. novcE-zelandica, Sowerby, Thes. Conch., iii, 1859, 65, pi. 213, 

 f. 48, 49 ; Conch. Icon., xv, pi. 11, f. 41 ; Crit, List, 23. Ancilla (An- 

 aulax) nana, Watson, Chall. Rep., xv, 1886, 230, pi. 17, f. 10. 



Shell narrowly ovate, brown with whitish and darker bands, a 

 high spire small-pointed, a concealed suture, a small mouth, and a 

 strong labial pad. Sculpture : Longitudinals there are very faint 

 lines of growth. Spirals the pillar and front of the shell is twisted, 

 scored, and white, with a sharply scored upper edge ; above this is 

 a brown band, defined above by a sharp small furrow, above which, 

 at a little distance, is another similar but shaiper furrow which runs 

 out into a little prickle on the outer lip ; the upper part of the body- 

 whorl is buried in enamel, banded with alternate white, brown, and 

 pale, the succession of which makes it possible to count the whorls. 

 Colour fawn, banded with white and brown. Spire high and small. 

 Apex small, bluntly rounded, and white ; it is free from enamel. 

 Whorls 6 ; the last is elongated and a very little tumid. Suture buried. 

 Mouth narrowly oval, pointed above, truncated and emarginate in 

 front. Outer Up flatly curved, thin, with a projecting point on the 

 edge in front. Inner lip slightly convex on the body, concave below ; 

 a thick labial pad loads the twisted pillar, fills the mouth above, spreads 

 out on the body, and covers the spire. Operculum triangularly lanceo- 

 late, sharp-pointed above, with a terminal nucleus lying toward the 

 outer edge, feebly lineated, thin, yellow, with a dull gloss ; it quite 

 fills the mouth of the shell. (Watson.) 



Diameter, 4-25 mm. ; height, 9-5 mm. (type of A. nana). 



Animal unknown. 



Type in the British Museum. 



Hob. Queen Charlotte Sound, near Long Island, in 10 fathoms 

 (" Challenger ") ; Bay of Islands ; Whangarei Heads ; off Great 

 Earner Island, in 110 fathoms ; near Cuvier Island, in 38 fathoms 

 (Captain Bollons) ; Hauraki Gulf, in 25 fathoms ; Manuka u Harbour 

 (Webster). 



Remark. The above synonymy is based on information kindly 

 supplied by Mr. E. A. Smith, I.S.O., of the British Museum. 



