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Across 1. Intermediate host of Sh dotti 8. which Fasciola find in highland 9. Schistosoma haematobium hybrid 10. Location of Oncomelania nosophora 12. Dormant period 15. A community of organisms 16. Root of Mollusc 21. Location of periostracum 22. between marine and river 26. All living organisms on Earth 27. repllant 31. land snails 32. Another name for corneous operculum 37. Intermediate host of Dicrocoelium dendriticum 42. tolerate high temperature 43. Intermediate host of Bilharzia 45. Causative agent of dermatitis in human 46. Lymnaea that not seen in Lorestan of Iran 47. Flies that used for biological control of snails 48. Amphibious 49. used for classification of snails

Down 2. The most important factor for fresh water snails 3. Big African snail 4. Always with Lymnea 5. first peak of Fasciolosis in Iran 6. Planorbidae 7. Hard water 11. Used for staining of radula 13. Nacreous layer of shell 14. study of shell 17. synonym of rachiglossan 18. Snails that sleep in cold weather 19. Rest in summer 20. Schistosomiasis in elephent 23. Small and Red snail 24. Torsion to left 25. Not seen in Iran 28. Brackish Basomatophora 29. Astrobilharzia 30. Live in flower pots, garbage cans and damp paper 33. Octopuses and squids belong to: 34. Intermediate host of Schistosoma rodhaini 35. Planorbis that not seen in hot weather in Iran 36. Intermediate host of Fasciola gigantica in Egypt 38. Used for relaxation of snails 39. Important family of freshwater snails 40. Snails that hunts other snails 41. radular teeth 44. No shell