674 



is flatter, and tlie concentric ridges, instead of being thickened, 

 are raised and laminated at the sides. 



Bay of Manilla, isl. Luzon, Philippines ; sandy mud. Cuming. 



68. Artemis scalaris (pi. cxliv. f. 78), Menlce (Cythersea), 

 Moll. Nov. Holl. p. 43. no. 241. 



Art. testa rotundata, subcompressa, paululum latiore quam 

 alta, albida, riifo pallido plus minusve radiatim et interruptim 

 picta, concentrice costellata ; costellis in medio plauatis, ad latera 

 tenue laminatis et elevatis ; lunula brevi, impressa, excavata. 



Larger and broader than A. juvenilis, the colouring a more 

 delicate fawn, and all the ribs continued to the sides, where they 

 are close and laminated. 



Mouth of the Swan Eiver, New Holland. 



69. Artemis anus (pi. cxliv. f. 82), Philippi, Abbild. C;^t7i. 

 pi. viii. f. 1. 



Art. testa subquadrato-orbiculari, subcompressa, crassa, con- 

 centrice costellata, pallide fasciatim fulva, ad apicem rufesceute ; 

 costellis acutis, subirregularibus, ad latera paucis, elevato-lamina- 

 tis, subdivaricatis ; lunula profunde impressa, laminata ; area liga- 

 menti angulatim excavata, jilana. 



llather squarish at t]\e sides, sliarply costellated, with the ribs 

 few, laminated and divergent at the sides, so as to give a wrinkled 

 appearance. Tlie ligamental area is flat and angularly excavated. 



New Zealand. Earl. 



70. Artemis prostrata (pi. cxliv. f. 80), Linn. Svst. Nat. 

 12th edit. p. 1183. 



Ai-t. testa oblicjue quadrata, compressa, pallide fulva, concen- 

 trice costellata; costeUis ad latera irregulariter et interruptim 

 couvergentibus et corrugatis, ad marginem dorsalem elevatim 

 sublamellosis ; area ligamenti subexcavata ; lunula subelongata. 



Not very far removed from A. anus; it is much squarer and 

 flatter, with tlie riblets more irregularly wrinkled and more ele- 

 vated at the dorsal margin. 



Mouth of Swan River, New Holland. Collie. 



71. Artemis laminata (pi. cxliv. f. 86, 87), Reeve, Conch. 

 Icon. pi. vii. f. 41. 



Art. testa alba, orbiculari, concentrice laminata ; laminis sub- 



