1910.] BRITISH SPECIES OF OSTRACODA. 219 



Prionocypris serrata. 



Fig. 13. Posterior antenna, X 140. 



14. Maxilla of first pair, X 240. 



15. Foot of second pair, end, X 240. 



16. Caudal ramus, X 140. 



Plate XXVI. 

 Candonopsis scourfieldi. 



Figs. 1, 2. Shell seen laterally and dorsally, X 65. 



3. Posterior antenna, X 240. 



4. Sense-organ of- same, X 350. 



5. Mandible, X 540. 



6, 7. Second maxillae of male, right and left, X 240. 



8. End of foot of second pair, X 240. 



9. Caudal ramus, X 150. 



10. Copulative organ of male, X 150. 



11. Ejaculatory duct of male, X 240. 



12. Ventral edge of shell, X 125. 



Plate XXVII. 



Siphlocandona similis. 



Figs. 1, 2. Shell seen laterally and dorsally, X 50. 



3. Posterior antenna, X 150. 



4. Mandible, X 150. 



5. Maxilla of first pair, X 240. 



6. „ second pair, X 200. 



7. Foot of first pair, X 240. 



8. „ second pair, X 240. 



9. Caudal ramus, X 240. 



Siphlocandona normani. 



Figs. 10, 11. Shell seen laterally and dorsally, X 55. 



12. Foot of first pair, X 240. 



13. „ second pair, X 240. 



14. Caudal ramus, X 240. 



Plate XXVIII. 

 Prionocypris tumefacta. 



Fig. 1. Left valve seen from inside, X 50. 



2. End of posterior antenna, X 240. 



3. Caudal ramus, X 240. 



Serpetocypris strigata. 



Figs. 4, 5. Shell seen laterally and dorsally, X 16. 



6. Posterior antenna, X 84. 



7. Tooth of first maxilla, X 350. 



8. End of foot of second pair, X 240. 



9. Caudal ramus, X 84. 



Ilyodromus robertsoni. 



Figs. 10, 11. Shell seen laterally and dorsally, X 30. 



12. Posterior antenna, X 140. 



13. End of foot of second pair, X 240. 



14. Caudal ramus, X 140. 



15. Tooth of anterior maxilla, X 240. 



