310 
CATALOGUE OF SHELLS. 
margin reflexed, simple beneath ; dorsal plate ? Very like 
Fhoias part'us, but larger, broader, and more acute in front. 
28. Pijina Zelandica^ N.s. — Shell triangular, elongate, 
blackish ; inside purplish pearly; valves convex, with rather 
close longitudinal ribs, armed with close, short, semi-cylin- 
drical, hollow spines. — Differs from P. squamosa^ in being 
smaller, black, and in the end being more truncate. 
21). Pecten laticostata, n. s. — Shell inequivalve, with 16-18 
radiating ribs, purplish white ; right valve convex, ribs smooth, 
the larger one depressed with one or two interrupted longi- 
tudinal grooves ; left valve rather concave, smoothish, purple 
brown, and purple near the umbo, the ribs distant, narrow. — 
Inhab. New Zealand. 
