29 



superior! costarum sulcls radlantibus recurvantibus postice profundi s 

 aratis ; umbonibus medianis eminentibus ; extremitatibus subacutis, 

 postica subtruncatii ; marglne ventrali postice flexuosa. Cavositas 

 polita, nitida. Long. 8 ; alt. 5 ; lat. 3 millim. Inhabits ? 



A singular little shell, the generic place of which is somewhat 

 doubtful. Its hinge of two cardinal and two lateral teeth, and its 

 flexuous posterior margin and the deep pallial sinus bring it among 

 the Tellinidae ; while its sculpture, solidity, and symmetry suggest 

 Corbis, with which the hinge is not absolutely inconsistent. 



Macoma luxella. T. parvula, alba, lasvis, ovato-triangularis, 

 ventricosa ; umbonibus postmedianis, acutis ; extremitate postica 

 semicirculari ; margine postero-dorsali cito declivi, extremitate trun- 

 cata ; area postero-dorsali crasse striata ; margine postero-ventrali 

 coutracta : cavositas levis, opalina ; sinu profundo, rotundato, vix 

 conspicuo ; cardinis dentibus pusillis. Long. 10; alt. 8 ; lat. 6 millim. 

 Inhabits China Seas, lat. 24° N. in 25 fathoms. W. S. 



The shell most nearly approaching it is T. mera of the American 

 Atlantic shore. 



Tellixa (subg. Arcopagia) saccularia. T. parvula, lucida, sub- 

 globosa, lactea, concentrice tenuissime striata ; umbonibus postmedi- 

 anis, rufescentibus eburneo lineatis ; extremitate postica leviter 

 truncata demum subsinuata ; declivitate umbonali obtuso : cardo satis 

 validus ; dentibus lateralibus duobus. Long. 10 ; alt. 9 ; lat. 6 millim. 

 Inhabits Loo Choo. W. S. 



Very like T. perula Gd, and possibly the same. It is less pouched, 

 and destitute of concentric lamellar strise and the two peculiar 

 white umbonal rays, though there are vermicidar opaque markings. 



Tellixa (Arcopagia) cratitia. T. tenuis, livida, compressa, 

 ovato-triangularis, costis acutis reclivantibus ad 30 (minoribus postice 

 interpositis) radiata, et laminis crebris concentricis reflexis costas equi- 

 tantibus cancellata ; umbonibus medianis ; marginibus dorsalibus 

 declivibus, subrectis ; extremitate postica acute rotundata, et plica 

 inconspicua, umbonali instructa ; margine ventraK arcuata, pectinata; 

 cavositas nitida, sulculata. Long. 15; alt. 11; lat. 5 millim. In- 

 habits Loo Choo, sandy bottom, 8 fathoms. W. S. 



Analogous to T. scobinata, but no species has been described with 

 similar sculpture, which is much like that of Venus matica. 



Lutraria lucida. T. tenuis, alba, oblongo-ovata, subfalcata, 

 concentrice undulata ; umbonibus ad trientem anteriorem positis, 

 acutis, eminentibus ; extremitate antica acute rotundata, margine 

 dorsali dt'clivi ; marg. postica concava, compressa, extremitate trun- 

 cata ; declivitate umbonali obtusa ; cavositate porcellana ; cardine 

 debili. Long. 40 ; alt. 20 ; lat. 8 millim. Inhabits Kagosima. W. S. 



Remarkable for its thin, lucid, fragile structure. A specimen in 

 Mr. Cuming's Coll. is larger than those collected bj^ the Expedition. 



