MORPHOLOGY OF OPISTHOCOMUS CEISTATUS. 



85 



Fig. 7. 



PLATE VIII. 



The same (1st Stage) : skull, lower view, x 6 diam. 

 (3rd Stage): skull, section, x 4i diam. 



„ hyoid arch, upper view, X 4^ diam. 



(2nd Stage): nasal labyrinth, section, x 20 diam. 



„ section of quadrate and stapes, outer view, x 15 diam. 



„ stapes, inner view, X 22^ diam. 



,, section of cervical vertebrre, X 24 diam. 



PLATE IX. 



Fig. 1. The same (1st Stage): shoulder-girdle and sternum, lower view, X 6 diam. 



„ „ part of shoulder-girdle and sternum, upper view, x 9 



diam. 

 „ „ furcula, lower view, x 9 diam. 



„ „ pelvis, lower view, x 6 diam. 



„ „ pelvis, upper view, x 6 diam. 



„ (3rd Stage) : part of pelvis, lower view, X 7| diam. 



Fig. 2 



Fig. 3. 

 Fig. 4. 

 Fig. 5. 

 Fig. 6. 



Fig. 1. The same (1st Stage) : 



PLATE X. 



manus, outer view, x 9 diam. 



part of manus, inner view, X 9 diam. 



part of Fig. 2, X 27 diam. 



part of poUex, outer view, X 12 diam. 



second to fourth digits (part), X 12 diam. 



manus, outer view, x 6 diam. 



part of same object, inner view, x 6 diam. 



manus, outer view, X Ih diam. 



manus, inner view, X H diam. 



ankle-joint, front view, X 12 diam. 



ankle-joint, front view, X 6 diam. 



[This memoir was not set up in type until after the Author's decease, which took 

 place July 3rd, 1890, nor had the Plates been lettered at that date. It has conse- 

 quently been a difficult task to correct the proofs, and I have to thank Mr. W. N. 

 Parker and Mr. F. E. Beddard for very material assistance in this matter. — P. L. S., 

 Jan. 12th, 1891.] 



