RaVMONU : HkACUKJl'ODA AND OSTRACODA OF THF. ChAZV. 259 



18. A bracliial \'alvc whidi is supposed to belong to the preceding species. 

 X 2. 



19. Camarella varians Billings. A brachial valve of an immature specimen. 

 Stage 2. X 4. Carnegie Museum. 



20. The same species. A pedicle valve of an immature specimen. X 4. 

 Carnegie Museum. 



21. The same species. A rather elongated adult, arrested at stage 3. 



22. The same species. An immature specimen, before the development of 

 the fold and sinus. X 2. Carnegie Museum. 



23. The same species. An immature specimen. Stage 3. X 4. 



24. The same species. An adult, arrested at stage 2. X 2. Yale University 

 Museum. 



25. 26. The same species, one of the specimens referred to in the text. X 2. 



27. The same species. An adult in which there are faint plications on each 

 side of the first plication in the sinus. X 2. 



28. The same species. An adult, arrested at stage i. X 2. 



29. 30. Camarella longirostris Billings. A specimen showing the elongate 

 beak, but lacking the wavy striae of the surface. X 2. 



31, 32. Camarella panderi Billings. A specimen from Pauquette Rapids, to 



compare with C. longirostris. Natural size. Carnegie Museum. 



33-36. Camarella varians Billings. Four views of a large specimen from 

 Sloop Island. X 2. 



