SuTEK.— 0;i Neio Zealand Polyplacophora. 



61 



I. longicymba, Quoy and Gaimard. 



Man. N.Z. Moll., p. 113. 

 I. parkeri, Suter. 



Proc. Mai. Soc. London, vol. ii., p. 186 (1897). 



Circumvallatus, Hutton (not of Keeve), is a synonym. 



Genus Plaxiphora, Gray (1847). 



Key to Species. 

 A. Valves exposed. 



B. Posterior valve not greatly reduced in size or 

 altered in form. 

 C. Central areas unsculptured save for grovfth- 

 lines. 

 D. Sutural pores or tufts distinctly de- 

 veloped. 

 E. Lateral areas with subobsolete 



radiating riblets . . . . P. superba. 



EE. Lateral areas with at least 2 dis- 

 tinct radiate ribs . . . . P. subatrata. 



DD. Sutural pores absent, girdle densely 



covered with bristles . . . . P. suteri. 



CC. Central areas sculptured, at least at the 

 sides. 

 D. Large. Sutural pores with bifurcating 



bristles ; girdle broad, reddish . . P. biramosa, 



DD. Small. Sutural pores with more than 

 2 bristles ; girdle narrow, white or 

 white and black . . . . . . P. ccelata, 



BB. Posterior valve reduced to a narrow crescentic 



form, strongly arched upward . . . . P. ovata. 



AA. Valves partially immersed in the girdle, which 



encroaches at the sutures . . . . . . P. obtecta. 



P. biramosa, Quoy and Gaimard, 



Man. N.Z. Moll., p. 116. 

 P. superha (Cpr.), Pilsbry. 



Pilsbry, Man. Conch. (1), vol. xiv., p. 319, pi. Ixviii., 

 figs. 55-61. 



P. cceluta, Eeeve. 



Man. N.Z. Moll., pp. 115, 116. 



Ziczac, Hutton, and terminalis, E. A. Smith, are 

 synonyms. 



P. suteri, Pilsbry. 



Nautilus, vol. viii. (1894), p. 8. 



Giliata, Hutton (not of Sowerby), is a synonym: Man. 

 N.Z. Moll., p. 116. 



P. subatrata, Pilsbry. 



Proc. Mai. Soc. London, vol. ii., p. 190 (1897). 



Atrata, Hutton (not of Sowerby), is a synonym: Man. 

 N.Z. Moll., p. 114. 



P. obtecta (Cpr.), Pilsbry. 



Pilsbry, Man. Conch. (1), vol. xiv., p. 330. 



