EXPLANATION OF THE PLATES. XXV 



Fig. 20. Two of the blind extremities from raw surface of leg, where 



they present a clavate appearance. 

 Fig. 21. View of the extremity, showing the dark spot supposed to be 



a germinal spot. 



PLATE XII. 



Fig. 9. Small longitudinal portion of shell from the large claw of 

 Cancer pagurus, showing the thickness of the annulus or 

 ring in it at the point of separation. 



Fig. 1 2. Longitudinal section of one of the legs of Cancer pagurus, 

 showing the natural position and relations of the reproductive 

 organ. 



a a. Femur. 

 6 6. Reproductive organ. 



c. Natural appearance of line of separation 



d. Coxa. 



Fig. 1 3. Enlarged foramen as it is seen on raw surface after the separa- 

 tion. This has been hardened in boiling water, which gives 

 it a much more defined appearance, and also enlarges it more 

 than it naturally should be. 



Fig. 14 Is a small portion of the femoral artery, about half-an-inch in 

 extent beyond the line of separation, which is covered as re- 

 presented by the peculiar vessels. 

 a. Distal extremity of blood-vessel. 



ON THE ANATOMY AND DEVELOPMENT OF THE CYSTIC 

 ENTOZOA. PLATES VI. X. XL XII. 



PLATE X. page 476. 



Fig. 1. Magnified view of one of the young of Acephalocystis armatus 

 still attached to the germinal membrane of a secondary 

 parent. It is taken from the group shown in Fig. 2, and is 

 still in an early stage of development, the circlet of teeth 

 still being minute and not fully developed. The absorbing 

 series of cells may be seen internally. 



Fig. 2. Small portion of the germinal membrane of a secondary parent 

 of Acephalocystis armatus highly magnified. 



Fig. 3. Small portion of germinal membrane of Acephalocystis armatus 



in a state of degeneration ; nothing is seen in the membrane, 



which is quite homogeneous, except the small cells figured a. 



6. Is the commencement of one of the cretaceous fatty masses 



described in the text. 



Fig. 4. Several of the stages of development of Cysticercus. 



a. First stage represents spines ; hardly if at all seen. 



b. Their first decided appearance. 



c. Third stage. 



