MARINE MOLLUSCA. 621 
Family NEOMENIIDAE. 
285. Proneomenia australis, Thiele, 34, XVJ/. V. 
Only a single specimen, apparently belonging to this species, was obtained. 
Family SPONDYLIDAE. 
286. Spondylus imperialis, Chenu, 37,/Y. IV. 
Family LIMIDAE. 
287. Lima (Mantellum) fragilis, Chemnitz, 40,b,/7. I, IX, XI, XV. 
288. Lima (Mantellum) inflata, Chemnitz, 40,0, 7. (Lima fasciata, 40,b,7.) XIII. 
289. Lima squamosa, Lamarck, 40,6,7. II. 
290. Lima (Ptenoides) tenera, Chemnitz jun.? 40,4,/. V. 
: Family PECTINIDAE. 
291. Pecten senatorius, Gmelin, 40,),/7., 37, V///. IJI—VI. 
Only young specimens obtained. P. /ayardi, Reeve, P. cristularis, Adams and Reeve, P. rugosus, 
Sowerby and some other so-called species, I regard as half-grown or young specimens of the 
present form. 
292. Pecten lemniscatus, Reeve, var. 37, V///._ II. 
293. Pecten mirificus, Reeve, 37, V///. V. 
294. Pecten noduliferus, Sowerby, 40,),7. V, XII. 
295. Pecten irregularis, Sowerby, 400,/7., 15. V, X, XII. 
Remarkable for the very numerous fine costae which are closely prickly scaled in fresh young 
specimens. 
296. Pecten nux, Reeve, 37,V///. II, V, VI. 
297. Pecten cooperi, n. sp. (Pl. XXXVI. figs. 15—18). VII. 
Testa parva, compressa, albida, rufo maculata, aequivalvis; valva sinistra costis principalibus 
novem et aliis gracilioribus intercalatis instructa, supra costas pulcherrime concentrice lamellata ; 
auriculae valde inaequales, postica minima, antica costis 2—35 magnis aliisque paucis tenuibus ornata, 
transversim tenuiter lamellata, lamellis supra costas incrassatis, conspicuis; valva dextra costis 
circiter 12, tri- vel quadripartitis, instructa, concentrice tenuiter lamellata; auricula antica costis 
tenuibus radiantibus circiter 10 squamulatis ornata, costa suprema marginali maxima. 
Longit. 124 mm., alt. 144, diam. 4. 
A single example only was obtained. The species has very remarkable sculpture and very 
unequal auricles. The concentric lamellae are similar on both valves but the costae are different. 
On the left valve there are about nine principal ones with a secondary one between them and 
often with still finer ones on each side of the secondaries. The right valve has about twelve costae 
each made up of three to five small ones, or in other words it is ornamented with numerous 
G. ‘II; 80 
