86 EDITH M. PRATT, B.SC. 



EXPLANATION OF PLATE 5. 



Fig. 1. Lepralia adpressa, var. Busk. Group of zocecia, magnified about 

 260 diam. 

 k, knobbed cell. 



a, knobs. Characteristic of British species, 

 s, spatulatc avicularium. 

 p, pores round margin between furroivs. 



Fig. 2. Single cell, magnified about 380 diam. 

 C. A., circular avicularium. 

 Ch.m., chitinous mandible. 



Fig. 3. Avicularia , magnified about 380 diam. 



a and b are avictdaria of the ordinary beak-like type, 

 c and d are circular avicularia, showing mandible in two different 

 positions. 



Fig. i. Porclla tridentata. Portion of colony showing disposition of zocecia, 

 'magnified about 260 diam. 



a, spatulatc avicularium, 



b, lateral raised ollar, meeting behind in a depression. 



c, median denticle. 



d, lateral denticles. 



RA, median avicularium. with rounded mandible. 



Fig. 5. Single cell, magnified about 3S0 diam. 



a, spatxdede avicularium. 



b, median avicularium with rounded mandible. 



c, median denticle. 



d, two lettered denticles. 



Ov, vi cell. ' 



