358 
DR. T. S. COBBOLD, FURTHER OBSERVATIONS ON ENTOZOa 
i 
EXPLANATION OP PLATE XXXIII. 
Fig. 1. Distoma conjunctum (mihi). x 25 diameters: a, oral sucker; b, ventral sucker; e, jesophageal 
bulb ; d, d, digestive caeca; e, reproductive papilla; f % uterine folds ; f 1 , egg x 220 diameters; 
g, ovary ; h> h, excretory ducts of (i, i) the albumenogene glands ; k, k 3 testes ; I, contractile 
vesicle. 
Fig. 2. A pair of the above-named Distomes, sexually connected. Slightly enlarged. 
Fig. 3. Upper fourth of Pentastoma denticulatum. ' x60 diameters, with the ventral surface exposed. It 
exhibits the mouth with its chitinous ring, the four cephalic claws with the hooks retracted, the 
alternating rows of integumentary spines and stigmata, a central clear space and dark lateral 
masses of cellular parenchyma. 
Fig. 4. One of the cephalic claws isolated and magnified 100 diameters: a, the moveable hook ; b, tubular 
portion of the chitinous capsule with its longitudinal groove (c) near the anterior border ; d, the 
hood ; e, the three-cornered point-cover ; f 9 extensor, and g, retractor muscles of the hook. 
Fig. 5. Diagram of a portion of integument, x 250 diameters : a, spines ; b, stigmata. The spaces between 
the rows of spines are vertically shortened one- third. 
Fig. 6. Group of parenchymatous cellules from the lateral dark masses, showing central nuclei and 
granular contents, x 220 diameters. 
Fig. 7. Two examples of Trichocephalus affinis, male and female. Slightly enlarged in breadth. 
Fig. 8. Head of one of the above, showing the small oral aperture and lateral alaform appendages. 
x 220 diameters. 
Fig. 9. Portion of the so-called neck displaying— a, longitudinal band of epidermal cellules ; a', four of 
the cellules under an altered focus ; b, oesophageal folds ; c, c, dermal rings ; d, d, oval cor- 
puscles, x 230 diameters. St 
Fig. 10. Spirally twisted portion of the body of a male Trichocephalus, magnified 20 diameters, showing 
the entire extent of the penis and its sheath, without any flask- shaped expansion. 
Fig. 11. Caudal extremity of the same : a, lower end of the sheath-like intromittent muscle ; b, anal open- 
ing; c, sheath of the penis, or appendix copulatorius, with conical retroverted spines, x HO 
Fig. J 2. 
diameters. 
Pointed free end of the penis, x 220 diameters. 
Fig. 1.3. Membranous vulva of the female Trichocephalus furnished 
the commencement of the vagina, x 140 diameters. 
Fig. 14. Four unimpregnated ova. x 220 diameters. 
retroverted spines, and enclosing 
Fig. 15. Fully developed egg. 
Fig. 16. 
x 180 diameters. 
X)ked embryo or 
Fig. i r. 
Fig. 18. 
occupying the intestine of a common fowl, x 180 diameters. 
Egg with enclosed embryo from Tania farciminalis . x 220 diameters. 
Egg of Trichosoma cerophilum. x 230 diameters. 
