DEVELOPMENT AND LIFE-HISTORIES OF TELEOSTEAN FISHES. 



937 



Fig. 15. G. morrlma, of March 16, 1886, side view of blastopore with a plug of yolk, 



Fig. 16. T. gurnardus, of May 28, 1886, surface view of caudal end of embryo at an early stage, 



Fig. 17. G. ceglefinus, of March 25, 1886, 4 p.m., similar stage to the preceding figure, 



Fig. 18. G. morrhua, of April 26, 12.30 p.m., side view of caudal end, .... 



Fig. 19. „ front view of cephalic end of embryo, with peculiar fold of epiblast and 



hypoblast, ........ 



Fig. 20. „ similar view to fig. 18, . 



Fig. 21. „ of May 12, 1886, blastopore closing, ..... 



Fig. 22. T. gurnardus, of May 28, 1886, 4th day, caudal end of embryo viewed laterally, . 



Fig. 23. G. morrhua, of May 16, 1886, 90th hour, caudal end of embryo and blastopore viewed 



from above, ........ 



Plate IV. 



Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 



Fig. 

 Fig. 



Pig- 

 Fig. 

 Fig. 

 Fig. 

 Fig. 



Fig. 

 Fig- 

 Fig. 

 Fig. 

 Fig. 

 Fig. 



Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 



1 . Transverse section of embryo of Pleuronedes flesus, 4th day (snout), 



2, 

 3. 



4. 

 5a. 



5b. 



5c. 



5d. 



5e. 



5/- 



6. 



7. 



4th day (fore-brain), 

 4th day (optic vesicles), 

 4th day (nuchal region), 

 4th day (posterior region of the trunk), 

 4th day (posterior region of the trunk), 

 4th day (posterior region of the trunk), 

 4th day (posterior region of the trunk), 

 4th day (close to margin of rim), 

 4th day (close to margin of rim), 

 immediately posterior to fig. 5b, 

 the two layers of fig. 5e, 

 the two layers of the blastodermic (extra 

 embryonic) area, 



9. G. ceglefinus, 5th day, hind end of embryo, ..... 



10. ,, 5 th day, otocystic region, ...... 



11. T. gurnardus, 4th da)', longitudinal section, ..... 



12. „ 4th day, slightly oblique longitudinal vertical section (nuchal region), 



13. „ oblique section through fore-brain and eye, .... 



14. P. flesus, oblique longitudinal horizontal section of anterior end of embryo, 



15. G. ceglefinus, oblique longitudinal horizontal section of anterior end of embryo (rim at the 



equator of the egg), ...... 



15a. ,, oblique longitudinal horizontal section on a lower plane than fig. 15, 



16. „ 4th day, oblique longitudinal horizontal section, further advanced than 



fig- 15, . ' 



17. P. flesus, transverse section at a later stage than fig. 4, 



18. Molva vulgaris, horizontal section through the choroid fissure, 



19. ,, horizontal section through the choroid fissure at a lower plane than fig. 18, 



20. ,, transverse section through fore-brain, .... 



X 



97 



X 



125 



X 



97 



X 



205 



X 



90 



X 



90 



X 



52 



X 



40 



xl75 



x20O 

 x20O 

 x200 

 x200 

 x20O 

 x200 

 x200 

 x200 

 x20O 

 x200 

 x500 

 x50O 



x500 

 xl20 

 xl20 

 xl35 

 xl35 

 xl35 

 x200 



x200 

 x200 



x200 

 xl20 

 x400 

 x400 

 xl20 



Plate V. 



1. Molva vulgaris, front view of head, 6 th day, .... 



2. T. gurnardus, pigment-spots on the trunk, 4th day, June 1886, 



2a. ,, yolk-sac, 1st day out, ..... 



2b. „ pigment-spot on yolk-sac (three stages in progress of corpuscle), 



3. P. limanda, ovum with abnormal embryo, May 8, 1885, . 

 3a. „ ovum with abnormal embryo, 3 days later, 



4. Undermined ovum (f) with oil-globule (034 inch in diam.), 



5. T. gurnardus, cyclopean embryo in ovo, ..... 



6. P. platessa, ovum with embryo well-developed, April 20, 1886, 



VOL. XXXV. PART III. (NO. 19). 



x about 55 

 x250 

 x400 

 x 400 

 Enlarged 

 Enlarged 

 x 40 

 Enlarged 

 x 40 



7 D 



