i92 



MONOGRAPH OF 



F.u. 15. 



16. 



17. 



Cytherella lavis. 



Bight valve, seen from side, x 40. 



above, x 40. 



front, x40. 



do. 



do. 



do. 

 do. 



Cytherella scotica. 



18. Canipacc, seen from left side, x40 



above, x 40. 



below, x40. 



front, x40. 



19. 

 20. 

 21. 



do. 

 do. 

 do. 



do. 

 do. 

 do. 



Bairdia obtusata. 



22. Carapace, seen from left side, x 40 



above, x40. 

 below, x40. 

 front, x40. 



23. 

 24 





do. 

 do. 

 do. 



do. 

 do. 



do. 



27. 



28. 

 '29. 



do. 



do. 



do. 



do. 

 do. 

 do. 



Cytheropteron latissimum. 



J(>. Carapace, seen from left side, x 40. 



above, x 40. 



below, x 40. 



front, x 40. 

 30. Separated valves, showing hinge-joint, 



x40. 



Cytheropteron nodosum. 

 II. Carapace, seen from left side, x 40 



82. 



88. 



84. 



do. 

 do. 

 do. 



do. 

 do. 

 do. 



above, x 40. 

 below, x 40. 

 front, x 40 . 



Bythocythere turgida. 



Fig. 35. Carapace (female), seen from left side, 



x40. 

 36. Carapace (female), seen from above, x 40. 



below, obliquely, x 40. 





37. 



do. 



do. 



38. Lucid spots, x 84. 



Cytheropteron subcircinatum. 



39. 

 40. 

 41. 

 42. 



do. 

 do. 



do. 



from 

 do. 

 do. 

 do. 



above, x 56. 

 below, x56. 

 front, x 56. 



Pontocypris (?) angusta. 



43. Carapace, seen from left side, x 56 



above, x 56. 



44. 



do. 



do. 



Cytheropt 



45. Carapace, seen from left side, x 40 



above, x 40. 

 below, x40. 

 front, x40. 



46. 



47. 

 48. 



do. 

 do. 

 do. 



do. 

 do. 

 do. 



Pseudocy there caudata. 



49. Carapace, from left side, x 40 



above, x 40. 

 below, x40. 

 front, x40. 



50. 

 51. 

 52. 



do, 

 do. 

 do. 



Cytheridea {?)subflavescens. 



53. Carapace, seen from left side, x 40 



below, x40. 

 front, x40. 



54. 

 55. 



do. 

 do. 



do. 

 do. 



Plate XXXV. 



Fie 



Paradoxostoma variabile. 



1 . Carapace of female (from deep water, 1-60 



fathoms), seen from left side, x 40. 

 Carapace of female, seen from above, x 40. 



front, x 40 . 



2. 



3. 



do. 



do. 



4. Carapace of female, seen from left side, 



x 40. 



5. Carapace of female, littoral variety, seen 



from above, x 40, 



6. 



7. 



do. 

 do. 



do. 

 do. 



12. Carapac 



below, x 40 

 front, x40 



naria beyond low-water mark), seen 

 from left side, x 40. 







Fig. 13. Carapace of female, seen from above, 



14, 



x40. 

 Younsr caraoace (littoral variety), seen 



g carapace 

 from left side, x 40. 



1 



5. 



16. 



do. 

 do. 



do. 

 do. 



above, x40. 

 front, x40. 



17. Aperture between contact -margins 



for 



protrusion of suctorial apparatus 



x!40. 



Paradoxostoma ensiforme. 

 8. Carapace, seen from left side, x 40 



9. 



do. 



do. 



above, x 40. 



