120 EXPLANATION OF PLATES. 
FIG. 
117 Cytherea Meretrix. e, escutcheon. 
117 a. C. Meroe; Gen. Meroe. 
117 b. C. Tripla; Gen. Trigona. 
117 c. C. Maculata. Gen. Chine. 
117 d. C. Castrensis. Gen. Circe. 
118 Artemis lincta. s, sinus in the Paleal impression. 
119 Venus cancellata. a, anterior; p, posterior; c, cardinal 
teeth. 
119 a. V. Verrucosa, Dosina. 
120 Pullastra Textile. 
121 Venericardia, recent species, resembling V. Planicostata, 
Lam. 
Fam. Cardiacea. 
122 Cardium Dionzeum, Hemicardium, Nonnul; Cardissa, 
Sw. 
123 Cardium maculosum. 
123* Groenlandicum. Aphrodita, Lea. 
123** hemicardium. Gen. Hemicardium. 
124 Cardita Calyculata. 
125 Cypricardia angulata. 
126 Isocardia Moltkiana. 
127 Megalodon cucullatus, (from Sowerby, Min. Con.) 
128 Hippagus Isocardioides, (from Lea.) : 
129 Hippopodium ponderosum, (from Sowerby, Min. Con.) 
130 Pachymya gigas, (from Sowerby, Min. Con.) 
Fam. Arcacea: 
131 Arca antiquata. 
132 Bysso-arca Noe. 
133 Cucullzea auriculifera, (from Sowerby’s Genera. Ve 
134 Pectunculus pilosus. 
135 Myoparo costatus, (from Lea.) 
136 Crenella, Brown. 
137 Nucula margaritacea, three views. 
138 Solenella Norrissii. 
Fam. Trigonacea. 
139 Trigonia pectinata. 
140 Castalia ambigua, Tetraplodon pectinatus, Spix. 
Fam. Nayades. 
141 Alasmodon complanatus, Say. Margaritana, Schum. 
142 Dipsas plicatus, Leach. Cristaria, Schum. 
143 Hyria corrugata, Lam. Paxyodon, Schum. Triplodon, 
Spix. 
