Habits and structure of Cotylaspis insignis Lerpy. 239 
Od Oviduct S. C Cuticular sense organ 
Oes Oesophagus Sp Spermary 
Oe. Gl Oesophageal glands Sp. D Spermatic duct 
Ov Ovary Tb Tuba fallopii 
P. Gl Parenchyma gland cell Tr. Cm Transverse nerve commissure 
P. Vs Posterior branch of recurrent Ut Uterus 
excretory vessel V. S Ventral sucker 
Par Parenchyma V. Sm Seminal vesicle 
Pg Pigment, in eye Vac Vacuole 
Ph Pharynx Vt Vitellaria 
P. P Pars prostatica Vs. D Duct from seminal vesicle to 
Pr Prostate gland cells cirrus 
Pr. Ph Prepharynx Vt. R Yolk receptacle 
R. Vs Recurrent excretory vessel 
Plate 13. 
Fig. 1. Anodonta opened so as to display the surface of the kindey 
and show two specimens of C. insignis in situ, nat. size. 
Fig. 2. Immature specimen of (. insignis killed with HERMANN’s 
fluid, with mouth funnel fully distended. 44:1. 
Fig. 3. Dorsal view of living C. insignis, very much contracted 
free hand. 
Fig. 4 View to show successive attitudes taken by the living 
animal. 14:1. 
Fig. 5. Dorsal view, combined from life and from total preparations. 
53:1. 
Fig. 6. Ventral view. 30:1. 
Fig. 7. Side view, somewhat idealized. 45:1. 
Fig. 8. Sagittal section, in plane of cirrus. 40: 1. 
Fig. 9. Transverse section, in plane ab of Fig. 8. 77:1. 
Fig. 10. ‘Transverse section, posterior region, in cd of Fig. 8. 77:1. 
Fig. 11. Tangential section, just below the surface, near the anterior 
‘end. 220:1. 
Fig. 12. Two muscle fibres, from section, showing the alternate 
light and dark areas, iron-haema, 850: 1. 
Fig. 13. Myoblast from methylene-blue preparation, free hand. 
Fig. 14. Section vertical to surface at junction of body wall and 
sucker, and origin of the diaphragm. 320:1. 
Fig. 15. One of the uni-cellular glands of the parenchyma, and its 
relation to the surface, from the mouth funnel. 850: 1. 
Fig. 16. Sections cutting across the deeper ends of the gland of 
preceeding figure, in their deeper portions. 567: 1. 
