4 ARKIV FÖR ZOOLOGI. BAND 7. NIO 12. 



The dorsal shield bears very minute hairs, fairly densely 

 scattered all över the surface; those of the anterior and 

 antero-lateral portions are stronger than the rest, which are 

 very small and inconspicuous. 



The marginal shield bears a dense row of radiating, po- 

 niard-shaped bristles inserted at the very edge of it; the row 

 begins externally of the anterior sinuosity; the bristles increase 

 successively in length towards the sides of the body; from 

 thence they diminish gradually in length towards the posterior 

 margin. 



Fig. 2. Part of the marginal shield; ap. apophysi, m. muscles. X 310. 

 Fig. 3. Marginal bristle, ventral view. X 812. 



Two pairs at the posterior margin, placed about as far 

 from the middle as from one another, are about V^ longer 

 than the others. 



On the dorsal side of the shield there are 8 pairs of short, 

 perpendicular bristles, placed at regular intervals in the an- 

 terior and lateral portions of it; posteriorly there is one pair 

 of slender, somewhat longer hairs, directed backwards. 



The marginal bristles are fusiform, very finely pointed 

 and with a neck-shaped constriction near the base; they are 

 articulated in deep condyli; between the bristles the cuticle 

 has interiör apophysi or thickenings, to which bundles of 

 radiating muscular fibres are attached (Fig. 2). 



The bristles (Fig. 3) seem to be very brittle, since many 

 of them were broken; the fine tips seem to be sHghtly 



