200 
The British Leeches 
DESCRIPTION OF PLATES XIII—XV. 
PLATE XIII. 
Fig. 1. Branchellion torpedinis, from an example in the Cambridge University Museum 
of Zoology. Dorsal aspect, x 1J. 
Fig. 2. The same. Anterior extremity. Ventral aspect, x 3. 
Fig. 3. The same. Interior of part of posterior sucker, much magnified. 
Fig. 4. Pisicola geometra. Dorsal aspect, x 3. 
Fig. 5. The same. Ventral aspect. Yellow example, x 3. 
Fig. 6. The same. Egg capsule, a, natural size, 6, magnified. 
Fig. 7. Pontobdella muricata, nat. size. 
Fig. 8. The same, at rest—a characteristic position, nat. size. 
Fig. 9. The same. Yellow variety. 
Fig. 10. The same. Egg capsules attached to a fragment of shell, nat. size. 
Fig. 11. The same. Egg capsule, side view, much magnified. 
Fig. 12. The same. Egg capsule, end view, much magnified. 
PLATE XIV. 
Fig. 13. Helobdella stagnalis. Dorsal aspect, x 4. 
Fig. 14. The same. Fully extended, nat. size. 
Fig. 15. The same. At rest, nat. size. 
Fig. 16. The same. Ventral aspect, x 4. 
Fig. 17. The same. Ventral aspect with adhering young, magnified. 
Fig. 18. Glossosiphonia heteroclita. Dorsal aspect, x 4. 
Fig. 19. The same. Ventral aspect with eggs and emerging embryos. x4. 
Fig. 20. The same. Small example, dorsal aspect, nat. size. 
Fig. 21. The same. Ventral aspect with eggs, slightly magnified. 
Fig. 22. Glossosiphonia complanata, var. A. Dorsal aspect, x 3. 
Fig. 23. The same. Ventral aspect, x 3. 
Fig. 24. The same, var. B. Dorsal aspect, x 3. 
Fig. 25. The same. Position assumed when disturbed, nat. size. 
Fig. 26. The same, var. C. Part of dorsal surface. x 3. 
Fig. 27. The same. In outline, nat. size. 
Fig. 28. Hemiclepsis marginata. Seen against an opaque background. Dorsal aspect, 
x 4. 
Fig. 29. The same individual rather more contracted, seen as a transparency. Dorsal 
aspect. x 4. 
Fig. 30. The same individual. Ventral aspect, seen as a transparency, x 4. 
Fig. 31. The same. In outline, nat. size. 
Fig. 32. The same, var. Jlava. Part of dorsal surface. x 4. 
PLATE XV. 
Fig. 33. Protoclepsis tessellata. Dorsal aspect, extended, x 4. 
Fig. 34. The same. Ventral aspect, extended, x 4. 
Fig. 35. The same. Contracted. x 4. 
Fig. 36. Hirudo medicinalis, from an imported example, nat. size. 
