Larvae of the British Ephemeroptera - Trekking & Outdoor

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The larvae (or nymphs) of this family (mayflies) look very similar to the adults. This key is illustrated with line drawings to highlight the differences between the species and is accompanied by extensive notes on their ecology including habitats and feeding behaviour.

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Expedition 54 Compass - Professional base plate compass designed for working on a map. With built in magnifier and luminous points. Units: mm, inches. Scales 1:25000, 1:50000, 1:63360 The Expedition 54 is two compasses in one with with an additional unique lensatic precision sighting system accurate to +/- 0.5°.

Grain Size Card - This pocket sized laminated card has sorting charts, roundness index and percentage area information for use when looking at sedimentary rock and percentages of minerals in rocks. Card size 7cm x 11cm

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