PLATE 14. Diatomaceae and Entomostraca. 



Figure 

 1. Acroperus nanus. 2. Acroperus harpce. 



3. Alteutha depressa. a, first pair of feet. 



4. Alona reticulata. 5. Alona quadrangularis. 



6. Anomalocera Patersoniiy male. 



7. Anchorella uncinata. a, arms ; b, abdomen ; c, ovarian tubes. 



8. Berkeley iafragilis. a, natural size ; b, portion of a branch containing frustules ; 



c, side view, d, front view of a single frustule. 



9. Biddulphia aurita. Frustules undergoing division: a, hoop of original frustule 



to which two new halves (c) have been formed ; the hoop of the new frustules 

 is seen at b ; the hoop of the parent has separated from the two frustules d d, 

 which are perfectly formed, each with its new hoop. 



10. Encyonema paradoxum. a, frustules contained in a gelatinous tube, side view ; 



b, front view ; c, separate frustules, side view. 



1 1 . Raphidoglcea micans. a y natural size ; b, group of frustules ; c, single frustule, 



front view. 



12. Schizonema Dillwynnii. a, natural size ; b, filaments containing frustules ; 



c, front view, d, side view of frustule. 



13. Zygoceros rhombus, a, front view ; b, side view. 



14. Syncyclia salpa ; frustules immersed in a gelatinous mass. 



15. Homceocladia anglica. a, portion of the natural size ; b, part of a filament con- 



taining two frustules ; c, front view, d, side view of a prepared frustule. 



16. Dickieia ulvoides. a, natural size ; b, portion of frond containing frustules ; c, 



d, f, prepared frustules, front view ; e y side view. 



17. Frustulia saxonica ; frustules immersed in a gelatinous mass. 



18. Cymbosira Agardhii. a, united frustules; b, front view, c, side view of pre- 



pared frustules. 



19. Sphenella vulgaris. a, front view; b, side view. 



20. Filaments found in a Cypris, noticed under OSTRACODA. 



21. Cetochilus septentrionalis, dorsal view. 



22. Notodelphys ascidicola, female. 23. Lepeophtheirus pectoralis, female. 

 24. Lerneonema spratta, female. 25. Macrothrix laticornis, female. 

 26. Moina rectirostris, female. 27. Sida crystallina. 



28. Neb alia bipes. 29. Polyphemus pediculus. 



30. Evadne Nordmanni. 



31. Peracantha ovata. , superior antenna. 



32. Pleuroxus trigonellus. 



33. Terpsinoe musica (front view, PI. 19. fig. 10). 



34. Podosira hormoides, front view. 35. Tessella interrupta, front view. 



36. Nicothoe astaci. a, ovaries. 



37. Grammatophora marina, as seen by ordinary illumination, a, front view; b, 



side view. 



38. Grammatophora subtilissima, as seen by ordinary illumination. , front view ; 



b t side view. 



