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PART II. SYSTEMATIC ACCOUNT 



the front edge (Fig. 93E). They lie on cone-shaped pulvilli (Fig. 93G), whose 

 dimensions, like those of the papillae, which bear them, increase considerably 

 towards the posterior part of the metameric region. 



Fig. 94. Birsteinia vitjasi: A - zone of thickened papillae in ventral view; В - girdles of toothed 



platelets in ventral view; С - the same from the dorsal side; D - part of a girdle of toothed platelets; 



E - a toothed platelet (only the bases of the teeth are indicated) ; F - spermatophore. 



an - girdle; da - anterior teeth; dp - posterior teeth;//- filament of spermatophore ; m -thickened 



base of filament; p - cuticular platelet; pa - papilla; pan - postannular region. (E- after Ivanov, 



1952.) 



