CRUSTACEA BRONCHIOPODA 



female mobile. The head separated by a deep depression 

 from the thorax. Cuticle with a polygonal pattern. 

 /3 A pair of ventral spines on posterior margin of carapace. 

 Scapholeberis, Schoedler (Fig. 20). 



FIG. 20. Scaphole- 

 beris mucronata, 

 female, x 25. 

 Oxford. 



y No spine on posterior margin of carapace. Simoceplialus, 

 Schoedler (Fig. 10, p. 39) : the cuticle with a pattern of 

 parallel branching ridges. 



Fia. 21. Moina rectirostris, female, x 24. Oxford. 



ii. First antennae of female long, mobile. Moina, Baird (Figs. 

 16, 17, 21): median eye absent. Posterior margin of carapace 

 without a spine. 



FIG. 22. Bosmina sp., female, x about 

 80. Lake Constance. 



FIG. 23. Acroperus leucocephalus, 

 x about 35. Oxford. 



