KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 59. N:0 3. 



99 



Explanation of figures. 



Plate 1. 



Fig. 



1 



Fig. 



2 



Fig. 



3 



Fig. 



4 



Fig. 



5. 



Fig. 



6 



Fig. 



7. 



Fig. 



8. 



Fig. 



9. 



Fig. 



10 



Fig. 



11 



Chama lazarus Linne. Hinge construction (after Bernard 1895). 



Echinochama arcinella Linne. West Indies. Nat. size. 



Pseudochama cornucopia Linné. Gulf of Suez. Nat. size. 



Chama macerophylla Chemnitz. West Indies. Nat. size. 



Echinochama arcinella Linné. Umbo of a left valve with nepionic shell. X 25. 



Echinochama arcinella Linné. Free nepionic shell, left valve from outside and inside. X 25. 



Pseudochama fcrruginea Reeve. Free nepionic shell, right valve from outside and inside. X 25. 



Pseudochama ferruginea Reeve. Left and right valve of a small specimen (breadth 2,5 mm) from 



Spondylus americanus, West Indies. X 20. 



Pseudochama gryphina Linné. Free nepionic shell, right valve from outside and inside. X 25. 



Pseudochama gryphina Linné. Free nepionic shell, left valve from outside and inside. X 25. 



Pseudochama gryphina Linné. A recently attached right valve. X 25. 



Plate 2. 



Fig. 12. Pseudochama gryphina Linné. A somewhat older right valve. X 15. 



Fig. 13. Chama reflexa Reeve. A left valve of a recently attached shell from Spondylus aculeatus. Gulf 



of Suez; length 1 mm. X 40. 

 Fig. 14. Chama reflexa Reeve. Gulf of Suez. A small right valve (length 1,25 mm). X 40. 

 Fig. 15. Chama reflexa forma jukesi. N. W. Australia. A small right valve. X 60. 

 Fig. 16. Chama reflexa forma jukesi, a more advanced stage of a right valve. X 35. 

 Fig. 17. Chama reflexa forma jukesi, the left valve corresponding to fig. 16. X 35. 

 Fig. 18. Cliama pulchella Reeve, the prototype, fig. 10 a, left and right valve from inside. Nat. size. Photo. 



Herring, N. H. Mus., London. 

 Fig. 19. Pseudochama similis n. sp. (= Chama pulchella Reeve, fig. 10 b), prototype, left and right valve 



from inside. Nat. size. Photo. Herring, N. H. Mus., London. 

 Fig. 20. Pseudochama pusilla n. sp. a, b, h right shell from outside and inside, c, d, g the corresponding 



left valve, e, f another left valve. a — f X 3,5; g, h X 7,5. 

 Fig. 21. Pseudochama pusilla n. sp. Umbonal part of a left valve with nepionic shell. X 20. 



Plate 3. 



Fig. 22. Pseudochama pusilla n. sp. General habitus of the animal. X 15. 



Fig. 23. Pseudochama pusilla n. sp. Oral region, showing labial palps, ganglia and attachment of gills. 



Fig. 24. Pseudochama pusilla n. sp. Alimentary canal. 



Fig. 25. Pseudochama pusilla n. sp. Right nephridium; the pericardial tube is cut open. 



Fig. 26. Pseudochama pusilla n. sp. Nephridia, seen from above; schematical. 



