34 Thracia Conradi p. 22 



35 Thracia Declivis (T. Pha- 



seolina) p. 22 



36 Mactra Australis p. 32 



37 Thracia Plicatap.21 



38 Mulinia Byronensis p. 34 



39 Mactra Fasciata (copied 



frem Gualtieri, as cited by 

 Lamarck) p. 30 



40 Mactra Triangularis p. 31 



41 Mactra Lactea p. 31 



42 Solen Corneus p. 11 



43 Panopsea Arctica p. 18 



44 Ungulina Oblonga p. 41 



45 Pandora Ceylanica p. 50 



46 Oblonga p. 49 



47 Depressa p. 49 



48 Glacialis p. 49 



49 Flexuosa p. 49 



50 Unguiculus p. 49 



51 Corbula Biradiata p. 47 



52 Ovulata p. 47 



53 Rostrata (of Bro- 



derip) p. 46 



54 Crassatella Triquetra p . 37 



55 Mesodesma Complanatum 



p. 38 



56 Donacium p. 38 



57 Erycina Cardioides p. 40 



58 Crassatella Donacina p. 36 



59 Lapidea p. 86 



60 Mactra Brasiliana var. 



p. 31 



PLATE XI. 



1 Clavagella Elongata Sheath 



p. 2 



2 valve p . 2 



3 Melitensis, valve 



p. 2 



4 Lata valve p. 2. 



5 Fistulana Clava, tube p. 3 



6 Mesodesma Glabellum p. 39 



7 Cytherea Impar p. 98 



8 Pholas Clausa p. 6 



9 Crassatella Decipiens p. 36 



10 Cytherea Impudica p. 96 



11 Psammobia Tellinella p. 58 



