PLATE XVIII. 
Fia. 1.— Parasite of greyhound, magnified 35 diameters by 
Tolles’s two-inch objective ; mounted in balsam ; helistat. 
Fig. 2. — PEDICULUS VESTMENTI, magnified 12 diameters by 
Tolles’s two-inch objective ; mounted in balsam ; heliostat. 
