51 



latere antico breoiore rotundato, postico lonyiore, subangidato; 



2)aUide fusca, nitida, tenuiter concentrice sulcata, margine 



ventrali regulariter arcuato. 

 Hab. Coast of Borneo. Mus. Cuming. 



A thin pale-bro\vn species, with the liiudside rather augulated, but 

 not distinctly rostrate. 



20. NucuLA BELtiOTii, A.. Adams. 



N. testą oblicįue ovafa, ventricosa, valde i)ieequilaterali ; latere 

 antico breviore ; lunida cordata, conspicua ; umbonibus erosis ; 

 epidermide crassa, nitida, olivacea induta, concentrice plicata, 

 2)Hcis validioribus ad marginėm ventralem ; area postica et 

 antica pallidis. 

 Hab. Arctic Seas (Sir E. Belcher). Mus. Cuming. 

 The beaks are much croded, and the valves are strongly pUcate 

 towards the ventral margin. I ha ve dedicated this fine Arctic species 

 to the memory of the galiant Bellot, who unfortunately lošt his life 

 in the search after Sir John Franklin and his brave companions. 



n ,v| 21. NucuLA NiTiDULA, A. Adams. 



iV. testą perobliąua, gibbosa ; latere antico obliąue subtruncato, 

 postico rotundato, producto; nitida, obseure sidcata, sub lente 

 radiatim striata ; umbonibus subacutis; pallide fusca, margine 

 valvarum tenuiter crenulata. 

 Hab. New Zealand. 



A very obhque gibbose species, radiately striated under the lens, 

 and produced and roanded posteriorly ; it is obscurely concentrically 

 sukate. 



22. NucuLA Layardii, A. Adams. 



N. testą transversim ovata, compressiuscula, nitida vix Iceoi, ob- 

 solete concentrice sulcata ; umbonibus margaritaceis ; latere an- 

 tico breviore excavato, ad partem ventralem subproducto ; pal- 

 lide viridi-fusca, margine valvarum simplici. 



Hab. Ceylon {E. L. Layard, Esq.). Mus. Cuming. 



A pale greenish-brown Nucula, with the anterior side short and 

 excavated, and the surface obscurely sulcate. 



23. Nucula margaritacea, A. Adams. 



N. testą transversim ovata, sublcevi, nacrea splendida tenuiter 

 concentrice obsoletim striata; lunula et area lanceolata in 

 medio prominentibus ; latere antico subangidato et producto, 

 margine valvarum simplici. 



Hab. Malacca (Br. Traill). Mus. Cuming. 



This is a rather smooth ovate species, glistening with a nacreous 

 lustre, especially towards the beaks. 



24. Nucula Paytensis, A. Adams. 



N. testą perobliąiia, transversim ovata, gibbosa; latere antico 

 brevissimo ; epidermide fusca induta ; lumda et area lanceolata. 



