PLATE LII. 
PAGE 
Figs. 1-3. BcPHORA QUADKicosTATA (Say) 207 
1. Ventral view. St. Mary's River. 
2. Ventral view of young individual. Cove Point. 
3. Specimen from Maryland, after Lister (fide Dillwyn). 
Fig. 4. EcPHORA QUADKICOSTATA var. uMBiLicATA (Wagner) 209 
4. Ventral view. Jones Wharf. 
Figs. 5-8. EcPHORA TRICOSTATA n. sp 209 
5. Ventral view. Plum Point. U. S. National Museum. 
6. Ventral view of younger individual. Same locality. 
7. Ventral view of very young individual. Same locality. 
8. Ventral view of aberrant form. Same locality. 
Figs. 9, 10. EcPHORA TAMPAiJNSIS ( Dall) 210 
9. Ventral view. Church Hill. U. S. National Museum. (After 
Dall.) 
10. Ventral view. Jones Wharf. 
