656 



pallide straminea induta, concentric^ distanter sulcata, sulcis ad 

 latera profundis paucioribus ; margine dorsali elevato ; latere 

 antico parvo ; lunula excavata, impressa. 



More ventricose than A. concentrica, with the anterior sides 

 small, and the posterior side large ; the sulci very distant in the 

 middle, and very deeply cut at the sides. 



Locality unknown. There are several specimens in Mr. 

 Cuming's collection. 



3. Aetemis ponderosa (pi. cxl. f. 2), Gray, Analyst, 1838, 

 vol. viii. p. 309. Cythera-a gigantea, Sowerly, Philippi, Abbild. 

 pi. vii. f. 1. 



Art. testa subrotundata, crassa, alba, epidermide pallida ni- 

 tente induta, irregulariter concentrice sulcata, sulcis in medio 

 evanidis ; ligamento elongato ; margine cardinal! lato, crasso ; 

 margine dorsali subclevato, simplici; lunula planata, profunde 

 impressa. 



More orbicular than A. concentrica, with the sulci worn out, 

 as it were, in the middle and towards the ventral margin. 

 Gulf of California, ; sandy mud at low water. 



4. Artemis nitens (pi. cxl. f. 11), Reeve, Conch. Icon. Ar- 

 temis, pi. iii. f. 12. A. concentrica, var. ? Ed. 



Art. testa subrotundata, paululum latiore quam alta, alba, epi- 

 dermide tenui nitente induta, regulariter concentrice sulcata ; area 

 ligamenti nulla ; margine dorsali subdeclivi. 



Smaller, when full-grown, and rounder than A. gigantea, with 

 the sulci smaller, more regular, and more continuous. It is not 

 easily distinguishable from A. concentrica, but its dorsal edge is 

 not quite so much raised. 



Locality unknown. In Mr. Cuming's collection. 



5. Artemis incisa (pi. cxl. f. 7), Reeve, Conch. Icon. pi. iii. 



f. 16. 



Art. testa A. Ratagonicce simili, sed magis rotundata, prope um- 

 bones magis compressa. 



If there be a real difference between this species and A. Pata- 

 gonica, it will be found in the greater roundness of outline and 

 the want of fullness and prominence of the shell at and about 

 the beaks. 



North Australia. Jukes. 



