104 



EXPLANATION OF PLATE XII. 



Fig. A. Notommata aurita, extended and rotating. 

 B. The same viewed laterally, contracted. 



EXPLANATION OF PLATE XV. 



Fig. H. The nervous, respiratory, and part of the muscular systems. The principal 

 viscera are omitted for the sake of perspicuity. 

 1, 1. The tortuous vessels. 



2. The contractile bladder. 



3. The tremulous respiratory tags. 



4. One of these in more rapid action. 



5. Bands of attachment. 



Fig. I. The muscular system, viewed dorsally. 



1. Tubular cavities in the head-mass. 



2. Transverse muscular bands. 



3. The bent lateral vessels (?). 



4. The occipital sac. 



5. The ganglionic mass. 



6. 6, 6. Its anterior longitudinal muscles. 

 9, 9 ; 10, 10. Its two posterior muscles. 



8, 8. The muscles for retracting the gizzard (7). 

 11, 11. Lateral longitudinal muscles. 



12, 12. Longitudinal foot-muscles. 



13, 13. Diagonal foot-muscles. 



15, 15. Muscles of the rectum. 



16. The foot-bulb. 17. The foot. 



18, 18. The foot-muscles. 



19, 19. The toes. 



20, 20. The expansors. 21. The closers of the toes. 

 Fig. D. The muscular system, viewed laterally. 



2 to 13. As in Fig. I. 



23, 24. Longitudinal dorsal muscles. 



25. Central cord of the occipital sac. 



26, 27. Arching cords (or vessels ?) from the same. 

 28. The frontal tube of the ganglion. 



Fig. G. The dental apparatus of the gizzard, as seen in action. 



Fig. E. The same under pressure : the mallei resolved into bony loops : the float- 

 ing muscular bands attached to the mallei, and to the table of the 

 incus. 



Fig. F. The same, under more powerful pressure : the arms or heads of the mallei 

 resolved into hands of five fingers (1 and 3) ; the rods into loops (2) ; 

 the incus into a bent spatulate foot (4), and two umbrella-like tables 

 (5). 



Fig. C. The appearance of the head when the ear-like lobes are inverted. 



