XYI 



,1 Swan Anadonta. 2 Utth Bird Hyria. 3 Painters' Unio. 4 Ambiguous Cas- 

 talia. 5 Toothed Trigonia. 6 Pearly Nucula 7 Ram- horned Diceras. 8 Leli- 

 cious Pectunculus. 9 Noah's Area. 10 Eared CucuUoea. 11 Heart Isocardia. 

 12 Striated Hiatella. 13 Guinea Cypricardia. 14 ^rf/6Ze Cardium. 15 /'wr- 

 rowed Cardita. 16 /Zee? Zcwoea. 17 Imbricated Venericardia. 18 Casma Fewm. 

 19 ZTen Ortygia. 20 ieaj/fd Oalathea. 21 CAwne Cytherea. 22 Islandic Cyprina. 

 23 Orbicular Exoleta. 



