COLLECTED IN NEW ZEALAND. 
309 
21. Polyodonta elegans, n. s. — Shell conical, white, purple- 
dotted ; whorles flat, with an elevated upper edge, and six or 
seven spiral rows of beads ; base flat, closely headed, and pur- 
ple-dotted ; unabilicus conical, deep smooth, opake white, 
22. Arthemis subrosea^ N. s. — Shell orbicular, rather convex, 
opake white, rosy purple on the umbones, with close regular 
minute concentric grooves, crossed by a few very obscure radi- 
ating striae ; lunule short cordate; inside white, disk opake. 
—Var. Lunule rather smaller. — Inhab. New Zealand. 
23. Dosina Zelandica, n. s. — Shell ovate, cordate, ventricose, 
solid, brown with close regular slightly elevated concentric 
laminae, which are higher at each end ; lunule large, ovate — 
cordate ; inside dead white ; hinge margin moderate ; hinder 
slope simple, without any flat shelving space on the left valve. 
Inhab. New Zealand. Very like Z). rugosa, but the ridges are 
thinner, closer, the shell more oblong, the hinge margin 
thinner, and the lunule much longer and narrower in propor- 
tion. — The DosincB have a small anterior additional tooth on 
the hinge margin. Lamarck refers them to Venus : they are 
intermediate between Venus and Cytherea. 
24. Lucina Zelandica, N. s. — Shell suborbicular, rather com- 
pressed, rather solid, opake white, smooth, very slightly 
concentrically striated, and covered with a thin smooth peri- 
ostraca. Inhab. New Zealand. Like L. lactea, but more com- 
pressed and opake. (Ligament linear, external, marginal.) 
25. Venus Yatei^ n. s. — Shell ovate, rather truncated behind, 
solid, brown, with rather distant thin concentric laminae, 
which are higher behind and before, and waved ; hinder 
slope depressed, lozenge-shaped ; lunule laminar. Inhab. New 
Zealand Like Venus pUcata^ but rather shorter ; concentric 
plates higher, waved, and torn on the edge. 
26. Psammohia lineolata^'in.^. — Shell oblong, transverse, com- 
pressed, obliquely truncated behind, purplish rosy, with rather 
darker concentric belts and very thin anastomosing, radiating 
lines. Inhab. New Zealand. 
27 . Pholas similis, N. s. — Shell oblong, rather elongate, acute 
in front, tapering behind, with rather close concentric laminae ; 
the anterior part with rather close and radiating groves; hinge 
