xxxiv. CO^GHYLIA—DITHYRA. 



4. minima, maculis quatuor sanguineis. 



with four scarlet spots. 



5. j_orbiculata, decussatim striata. 



with decussate striae. 



36. Venus. 

 * margine interno crenulato. 



with the inner margin notched, 

 f orhiculo-cordatee. 



orbicular heart-shaped. 



1. verrucosa, subglobosa, lateribus verrucosis. 



nearly globular, warty at the sides. 



2. Casina, orbicularis, laminis subimbricatis. 



orbicular, with somewhat imbricate plates. 



3. reflexa, antic^ subangulata laminis rejlexis. 



a little angular at the anterior end, where the 

 plates are reflected. 



4. cancellata, laminis remotis crebro cancellatis. 



with remote plates which are closely cancellated. 



5. subcordata, striis remotis longitudinalibus lamellas remotiores 



decussantibus. 



with remote longitudinal striae decussating the 



more remote plates. 



6. granulata, granulatim decussata. 



decussate in a granular manner. 



7. fasciata, costis latis planatis lesvibus. 



with broad flat smooth ribs. 



