SUTER: NEW ZEALAND TROCHIDA. 264 
always easily separated. 
Found mostly with the preceding species, from which it is not 
9, Monoponta PoRcIFERA (Watson). 
-? Labo porcifera, A Adams: Proc. Zool. Soc., 1851, p. 179. 
Trochus (Diloma) poreifer (A, Ad.): Watson, Rept. Challenger 
: Exped., Gastropoda, p. 67, pl. iv, fig. 12. 
Diloma nigerrima, Chemn. : Hutton, Man. New Zealand Moll, p. 96; 
¢ Hutton, Trans. New Zealand Inst., vol. xv, p. 125, 
pl. xv, fig. B (radula). 
Monodonta nigerrima (Chemn.): Hutton, Proc. Linn. Soc. New South 
Wales, vol. ix, p. 866 [not nigerrima (Gmel.), Philippi |. 
Monodonta porcifera, Watson: Pilsbry, Man. Conch., ser. 1, vol. xi, 
p. 102, pl. xxu, figs. 53, 54. 
Shell depressed, globose, bluish-black, polished, superficially lirate, 
sometimes sparsely dotted with white. Suture margined below. 
Outer lip margined with black. Columella not dentate, broad, sub- 
‘concave. Opaque substance of columella extending upon the base of 
the aperture, forming a strong ledge within. Alt. 10-18, diam. 
15°5-16°5 mm. 
My specimens do not show a trace of white spots, but otherwise 
agree with Watson’s description. J/onodonta coracina also occurs, with 
and without yellow spots. 

Portion of radula of Monodonta porcifera (Watson). 
The figures of the teeth of the radula of Deloma nigerrima published 
by Captain Hutton, and quoted above, are very likely those of another 
species (Monodonta coracina?). 1 therefore give here the figures of 
the teeth of specimens which I consider to be typical, collected at 
St. Clair, near Dunedin. 
Hab.—The only specimens I have seen and collected on rocks are 
those from St. Clair, Dunedin. Captain Hutton quotes the following 
localities: Banks’ Peninsula to Dunedin, Chatham Is., Auckland Is. 
10. Monoponta coractna (Trosch.). 
Trochus diy as Troschel in Philippi: Conch. Cab., p. 148, t. xxiv, 
e. 13. 
Monodonta coracina (Troschel): Pilsbry, Man. Conch., ser. 1, vol. x1, 
p. 108, pl. xix, fig. 94; pl. xxxi, fig. 28. 
