| 31. | During the courtship these snails spear the partner with a calcareous dart.
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| 32. | It is found only on calcareous substrates such as limestone.
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| 33. | It prefers a calcareous substrate, but also grows in neutral soils.
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| 34. | The northern region consists of calcareous sediments that have shown high permeabilities.
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| 35. | They secrete and inhabit a permanent calcareous tube attached to hard substrata.
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| 36. | This method made the supply of calcareous ore from the Sch�nberg unnecessary.
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| 37. | Elsewhere, deeper limestone soils support a diversity of calcareous grassland species.
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| 38. | Soils are either calcareous ( neutral or somewhat alkaline ) or acidic.
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| 39. | The skeleton is composed of many calcareous ossicles and spicules.
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| 40. | In this lake, extensive silty calcareous, glacilimnic layers were deposited.
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