136 



PRACTICAL MICROSCOPY. 



Books which may be consulted : 'How to Work with the 

 Microscope/ Beale ; Brunton, Foster, Klein, and Sander- 

 son's ' Handbook for the Physiological Laboratory ' ; Syl- 

 vester Marsh's ' Section Cutting ' ; Rutherford's ' Practical 

 Histology.' 



CRUSTACEA. In this branch are specimens innumerable, 

 the Entomostraca being included under this head. They 

 may all be taken with the appliances already mentioned, 

 and what will do for Infusoria will also be sufficient for 

 Crustacea. Daphnia pulex, the water flea ; Cyclops quadri- 

 cornis ; Cypris tristriata ; A rgulus foliaceus, the fish louse ; 

 Asellus vulgaris, the water wood-louse ; Gammarus pulex, 

 the fresh- water shrimp; Bosmina longirostris (Fig. 121); 



FIG. 121. 



Chirocephalus diaphanus, the fairy shrimp, are all to be 

 found in easily accessible ponds during the spring, summer, 

 and autumn. 



Books which may be consulted: Baird's 'British Entomo- 

 straca' ; 'The Micrographic Dictionary.' 



