Family VI.— ARCID/E, Lowe. 



Genus I.— Nucula, Lam. 



NucuLA SULCATA, Brown. 

 Nucula nucleus, L. 



Nucula nucleus, v radiata, F. c^ H. 



Nucula nucleus, v tumidula. Malm. 

 Nucula nitida, G. B. Sow, 



Nucula nitida, v turgida, Mar. 

 Nucula tenuis, Mont. 



Nucula tenuis, v inflata, Han. 



Genus II.— Leda, Schn. 

 Leda pygm^a, Mi'inst. 

 Leda minuta, Miill. 



Leda minuta, v brevi rostris, y^f/fl 



Genus III. — Limopsis, Sassi. 

 LiMOPSis aurita, Byoc. 



Genus IV. — Pectunculus, Lam. 

 Pectunculus glycyaierls, Z. 



Pectunculus glycymeris, v pilosa, L. 

 Pectunculus glycymeris, v decussata, Tiirt. 

 Pectunculus glycymeris, v nummaria, Tiirt. 

 Pectunculus glycymeris, v globosa,y>^ 

 Genus V. — Area, Linn. 

 Arca pectunculoides, Sea. 



Arc A LACTEA, L. 



Arca tetragona, Poli. 



Family VII.— GALEOMMID/E, Gray. 



Genus Galeomma, Turt. 

 (iALEOMMA Turtoni, Eds. Zool Jour. 



Family VIM.— KELLIID/E, F. &^ H. 



Genus I. — Lepton, Turt. 

 Lepton squamosum {Mont.) 

 Lepton nitidum, Turt. 



Lepton nitidum, v convexa, Aid. 



