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Show 1895.] HYDEACHNID POUND IN C O E N W A L L . 207 sa. Azygous salivary gland. sb. Salivary bladder. sgq. Quadrate salivary gland. sgr. Reniform salivary gland. sgt. Tubular salivary gland. sm. Sperm-mother-cells. sp. Sigmoid chitinous piece containing air-chamber. T. Testicular mass. •tr. Tracheal tra. Principal tracheal trunk from stigma to air-chamber. tre. Efferent tracheal trunk from air-chamber to body. tv. True testicular portion of the testicular mass. tvs. Portion of testicular mass functioning as a vesicula seminal is. v. Ventriculus. vb. Hind bridge of ventriculus. vd. Vasa deferentia. All the figures are drawn with the anterior end nearest to the top of the page. PLATE VII. External structure. Fig. 1. 6*. Dorsal surface, X 50, drawn from life. Fig. 2. o*. Ventral surface, X 43, drawn from a preparation. The § m Dotn cases w o u l a De 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 J, 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. cu., soft cuticle. Fig. 12. Second right leg of o* from above, X 95. Fig. 13. Fourth right leg of 3 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 tbe large opening in the middle of the hollow-square-ventriculus. Fig. 15. The excretory organ alone seen from the side (f 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 apparently 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 penial canal (pc.) is the ductus ejaculatorius. |
