PLATE I. 



^n. stands foi antennas. 



r.gl. ,, cement-glands. 



/". , , muscular fibres. 



gs. „ supracesophageaJ ganglion. 



gt. „ thorai ic ganglion. 



gl, „ gland of unknown nal 



I. „ thorai ic appendages. 



., moutli. 



mr. stands for retractor muscle of the thorax. 



Fi<*. l. Male of Scalpellum regiwm (Wyv. Thorns.), Hoek; magnified 94 diameters. 



Fig. 2. Nervous and alimentary systems of this male ; magnified 275 diameters. 



3. Antenna of the male ; magnified 275 diameters. 



Fig. i. Transverse section of the supraoesophageal ganglion where it is in relation with 

 the oesophageal ring; magnified L'7. r > diameters. 



Fig. 5. Transverse section of the thoracic ganglion and the thorax with its appen- 

 dages; magnified "27. : > diameters. 



Fig. 6. Spermatozoa and spermatozoid mother-cells; magnified 57o diameters. 



Fig. 7. Epithelium of the sack and muscular fibres in a young stage of development ; 

 magnified 275 diameters. 



