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Cosmarium binoculatum. 34. Cyclops quad. 35. Cyphroderia amp. 36. Cypris tristriata. 37. Daphnia pulex. 38. Diaptomas castor. 39. " sull. 40. Diatoma vulgaris. 41. Difflugia cratera. 42. " globosa. 43. Dinobryina sertularia. 44. Dinocharis pocillum. 45. Dirt. 46. Eggs of polyp. 47. " entomostraca. 48. " plumatella. 49. " bryozoa. 50. Enchylis pupa. 51. Eosphora aurita. 52. Epithelia, animal. 53.
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