1895.] HYDBACmflD FOUND IN COENWALL. 207 



sa. Azygous salivary gland. 



sb. Salivary bladder. 

 sffq. Quadrate salivary gland. 

 sffr, Reniform salivary gland. 

 sfft. Tubular salivary gland. 

 sm. Sperm-mother-cells. 



sp. Sigmoid chitinous piece containing air-chamber. 

 T. Testicular mass. 



tr. TracheiE. 

 tra. Principal tracheal trunk from stigma to air-chamber. 

 tre. Efferent tracheal trunk from air-chamber to body. 



iv. True testicular portion of the testicular mass. 

 tvs. Portion of testicular mass functioning as a vesicula seminalis. 



V. Ventriculus. 



vb. Hind bridge of ventriculus. 



vd. Vasa deferentia. 



Ml the figures are drawn with the anterior end nearest to the top of the page. 



Plate VII. 



External stnicture. 



Pig. 1. S- Dorsal surface, X 50, draven from life. 



Fig. 2. (J . Ventral surface, X 43, drawn from a preparation. 



The $ in both cases would be similar except as regards size. 

 Fig. 3. Mandible of $ from the side, X 175. a, membranous portion ; 



b tendon of the extensor, c of the retractor muscles of the second 



joint. 

 Fig. 4. Maxillary lip and right palpus ; | view from above and left side, 



X 85. 

 Fig. 5. Right palpus from the inner (left) side, X 170. 

 Fig. 6. Inner edge of the first right epimeron, X 160, to show the hairs &c. 

 Fig. 7. The lowest except one of these hairs, X 320. 

 Fig. 8. One of the more finely pectinated hairs, X 320. 

 Fig. 9. Genital aperture, surrounding sclerites, and so-called suckers of r^ , 



X 85. 

 Fig. 10. Anal plate (see remarks pages 185, 186), X 160. rm., retractor muscles 



of the labia. 

 Fig. 11. A small portion of one of the chitinous plates in the cuticle seen 



from within, X 300. It was drawn from one of the lateral plates. 



etc., soft cuticle. 

 Fig. 12. Second right leg of (J from above, X 95. 

 Fig. 13. Fourth right leg of cJ from below and side, x 95. 



Plate VIII. 



Internal Organs. 



Fig. 14. Ventriculus and excretory organ seen from above, X 65. The 

 excretory organ partly overlies the anterior median caecum of the 

 ventriculus and then turns downward, passing through the large 

 opening in the middle of the hollow-square-veDtriculus. 



Fig. 15. The excretory organ alone seen from the side (| view), x 85. The 

 inner side of the so-called anal plate is seen, and muscles for distending 

 the anal aperture, which, however, only forms an exit for the excretory 

 organs, not aj)parently for the alimentary canal. 



Fig. 16. The salivary glands and ducts from one side of the body, x 175. 

 The quadrate salivary gland is turned over and separated from the 

 kidney-shaped gland so as to show the ducts ; the two glands really 

 lie close together. 



Fig. 17. The male genital system seen from above, X 110. The small bulb 

 between the vasa deferentia {vd.) and the peuial canal {pe.) is the 

 ductus ejaculatorius. 



