G7(i 



This species presents a medium between A. variegata and A. 

 exoleta in general appearance^ and in the character of the ribs 

 and markings. The ribs are much more close and fiat than in 

 A. variegata. 



Philippines. Cuming. 



Genus LUCINOPSIS, Forbes 8f Hanlet/. 



LuciNOPSis UNDATA (pi. cxHv. f. 88, 89). Venus undata, 

 Pennant, Brit. Zool. vol. iv. pi. 55. f. 51. Venus sinuosa. Id. 

 Lucina undata, Tiirtun. Venus incompta, Fkilippi. Cythersea 

 undata, Macgil. Artemis undata, Ahler. 



L. testa tenuis iiiflata, pallide fulva, subquadratim rotuudata, 

 irregulariter et leviter substriato ; margine dorsali subelevato ; 

 margine postico subsinuato ; cardine postice subcomplanato, den- 

 tibus in valva sinistra tribus centralibus, quarum medio dupli- 

 cato, in valva dextra duobus ; ligamento maguo, interne compla- 

 nato ; irapressione pallii sinu magno rotuudato. 



It seems doubtful wliether the characters named by the pro- 

 posers of this genus are sufficient to distinguish it from the Ar- 

 temides. The teeth slightly differ, and the sinus in the muscular 

 impression is less angular. 



A well-known species, found in various parts of the British 

 coasts. 



LIST OF FIGURES IN PLATES CXL. TO CXLIV. 



{The Figure after each name is the number of the Species.) 



Fig. 



Plate CXL. 



1. A. concentrica, 1, Gmel. 

 3. — ponderosa, 3, Gray. 



3. — distans, 2, Soiob. ? 



4. — concinna, 9, Sowb. 



5. — Dunked, 7, Ph. 



Fig. 



6. A. simplex, 8, Hani. 



7. — iucisa, 5, Reeve. 



8. — Patagonica, 6, Fk. 



9. — discus, 10, Reeve. 



10. — plana, 11, Reeve. 



11. — nitens, 11, Reeve. 



