62 W. BALDWIN SPENCER. 



Opening of ducts at base of hooks, 0. m. Oblique muscles. 0. P. Upper 

 lip. Pa. gl. Parietal glands. Ph. Pharynx. V. D. Vas deferens. 1. Nerve 

 to anterior wall of oesophagus, 9, Ventral nerves. 



Fig. 9. — Transverse section across the anterior part of the head of a 

 female. The section shows the ducts of the hook-glauds, and the opening of 

 two of these at the bases of the two hooks which lie nearest to the mouth. 

 Zeiss, A, oc, 4. 



Fig, 10, — Obliquely transverse section across the anterior end of the body 

 of a female. The bases of the two hooks nearest to the mouth are cut 

 through, and the oral papillae or upper lip. The very anterior end of the 

 mid-gut is seen, and above this the mass of special gland-cells of unknown 

 function. The cells of the head-gland are sparsely distributed. Zeiss, A, oc. 4. 



Fig. 11 (cf. Section A). — Transverse section across the body of a male, 

 just behind the opening of the atrium genitale and almost along the plane A 

 of Fig. 6. The common tube running down from the cirrus-sac and the 

 dilator rod -sac on either side is seen, and lying in this the lower portion of 

 the dilator rod. Between the two tubes lies the hinder part of the nerve 

 mass, and from each one arises the accessory gland. The section is just cut 

 through the part at which the hook- and head-glands pass into one another, 

 and together with the parietal glands form a mass of cells filling up the spaces 

 between the muscles and different organs of the body. Outline drawn with 

 camera, Zeiss, A* details with C, oc. 2. 



Fig. 12. — Obliquely transverse section across the body of a larger male 

 than that of which a section is represented in Fig. 11. Slightly behind the 

 atrium genitale the oblique muscles commence, and this section is taken in a 

 plane slightly posterior to that of Fig. 11, and just at the very commencement 

 of these muscles. The upper and right-hand parts of the section lie anteriorly 

 to the lower and left, so that the cirrus bulb and dilator rod-sac are seen on 

 the left, and the accessory gland on the right. Ventrally the special muscles 

 concerned with the pulling down of the rod- and cirrus-sacs are cut through, 

 so that this part lies behind the atrium genitale. The very anterior end of 

 the hook -gland is cut through. Outline drawn with camera, Zeiss, A*, details 

 with C, oc. 2. 



Fig. 13 (cf. Section B). — Transverse section across the body of a male 

 through that i)ortiou of the reproductive organs where the cirrus bulb, cirrus- 

 sac, and dilator rod-sac are all in contact with one another. The section lies 

 along the plane B. The hook-glands are here distinct from the hcad-glauds. 

 Ventrally the muscles concerned with the pulling downwards of the genital 

 sacs arc cut through where they cross one another. Outline drawn with 

 camera, Zeiss, A*, details with C, oc. 2. 



Fig. 14 (cf. Section C). — Transverse section across the body of a male 

 through the plane C. The cirrus bulb on the left side is attached to the 

 upper and inner surface of the rod-sac in which the strong muscular mass 



