Mn,i,t<li<nl<i.\ GASTROPODA. 



Animal like M. cethiops, the foot being margined with a band of 

 black-and-white transverse stripes. 



Type in the Canterbury Museum, Christchurch. 



Hab. Sumner ; Lyttelton ; Banks Peninsula to Dunedin : under 

 stones near low- water mark ; rather rare. 



6. Monodonta excavata, Adams and Angas, 1864. Plate 38, fig. 9. 



Trochocochlea excavata, Ad. & Ang.. P.Z.S., 1864, 37. Monodonta excavata, 

 Ad. & Ang., Man. Conch. (1). 'xi, 101), pi. 35, f. 1-3 ; Suter, P. M.-il. S. 

 ii, 265. Trochocochlea constricta. Lain. : Hntton, J. de Conch., 1878, 33, 

 not of Lamarck. 



Shell small, depressed conical, imperforate, base concave. Sculp- 

 ture consisting of numerous spiral sulci, crossed by distinct oblique 

 growth-lines, the latter predominant on the last whorl ; base with 

 3 to 4 very distinct spiral sulci. Colour light green, closely maculated 

 and mottled in minute pattern with dark olive, the markings some- 

 times assuming the form of obliquely descending dark bars. Spire 

 conoidal, the apex mostly eroded, whitish. Whorls 4, the last conic 

 above, flattened beneath, carinate at the periphery. Suture well im- 

 pressed. Aperture occupying almost the entire surface of the base, 

 large and very oblique, pearly and smooth within. Outer lip acute, 

 arcuate, with a black edge followed by an opaque white band. Colu- 

 mella subhorizontal, its edge arcuate, tbin, acute, extending below 

 upon the base and forming a ledge within the basal lip. Umbilical 

 tract very large, concave, white, bounded by light brown ; a tongue- 

 shaped pointed short band, but slightly pearly, extends from the 

 basal lip toward the centre of the umbilical tract. 



Diameter, 6 mm. ; height, 5 mm. Diameter, 11-5 mm. ; height, 

 10 mm. (specimen from Greymouth). 



Dentition. Button, T.N.Z.I., xv, 126, pi. 15, f. F. 



Type in the British Museum. 



Hab. West coast of the North and South Islands ; Manukau 

 Heads ; Cape Egmont ; Greymouth ; Chatham Islands. 



7. Monodonta lugubris, Gmelin, 1790. Plate 38, fig. 10. 



Trochus lugubris, Grnel., Syst. Nat., ed. xiii, 3583. Monodonta lugubris, 

 GmeL, Man. Conch. (1), xi, 100, pi. 19, f. 93 ; pi. 35, f. 24, 25 : Suter, P. 

 Mai. S., ii, 265. Trochus cingulatus, Q. & G., Voy. Astrol., Zool., iii, 

 1834, 259, pi. 64, f . 16-20, not of Brocchi nor Menke. Monodonta angu- 

 latum (misprint for cingulatum), Gray, Dieff. N.Z., ii, 238. Trochus 

 Gaimardi, Phil., Conch. Cab., 211, pi. 31, f. 7-9. T. Bernardi, Recluz, 

 J. de Conch:, 1852, 166, pi. 7, f. 5. T. sulcatus, Wood, Ind. Test. Suppl., 

 pi. 6. f . 40, not of Martyn nor Lamarck. T. bicanaliculatns, Dunker : 

 Philippi, Conch. Cab., 202, pi. 30, f. 6. 



Shell small, solid, thick, imperforate, depressed conic, blackish, 

 with strong spiral ridges. Sculpture consisting of strong spiral nodu- 

 lous ridges, 3 on the penultimate whorl, interstices with 3 to 4 fine 

 cinguli ; base concentrically lirate, the lirse coarsely granulosc, about 



