DEVELOPMENT AND LIFE-HISTORIES OF TELEOSTEAN FISHES. 



939 



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Fig. 9. Heart and other organs of T. gurnardus, just hatched, seen from above, June 2, 1886, ! 



Fig. 10. Young pleuronectid (unknown sp.), April 7, 1887, front face view, 



Fig. 11. T. gurnardus, 4th day, transverse section through the heart, with mesoblast (mes), 



Plate IX. 



Anterior end of T. gurnardus, 3rd day, June 19, 1886, .... 



Molva vulgaris, 4 days old, May 12, 1886, 



„ „ 5 days old, May 13, 1886, ..... 



Head and anterior region of P. platessa, 8 mm. in length, and 4 days old, April 22, 1886, 

 Anterior end of T. gurnardus, 8th day, June 24, 1886, .... 



G. ceglefinus, branchial and mandibular cartilages, April 20, 1886, 



Mandible of G. mglefinus, 10 days old, ...... 



Blastoderm of T. gurnardus at the stage of about sixty blastomeres : x, intra-blastomeric 

 spaces apparently filled with fluid, ...... 



Molva vulgaris, margin of disc and nuclei of periblast, .... 



Gadus ceglefinus, 24th hour; the figure shows some marginal cells of the blastoderm, and a 



portion of the nucleated periblast, . . . . . . . x415 



Plate X. 



Slightly oblique view of the head of an advanced larva (15th day) of Trigla gurnardus, . x 40 



Trigla gurnardus, showing pigment in pectoral fin and visceral anatomy, 1 6th day, . Magnified 



,, „ ventral view of same, 16th day, ..... Magnified 



,, „ advanced embryo, 17th or 18th day, ..... Magnified 



Blastodisc of Trigla gurnardus at the 6 th hour, viewed from above ; third furrow nearly 



completed. Oil-globule (og) seen below, . . . . . x 80 



Larva of Gadus morrhua, ventral view of head, May 11, 1886, .... Magnified 



,, ,, ,, dorsal view of head, May 11, 1886 ; the heart is indicated by the 



dotted lines, ...... Magnified 



Opercular aperture of Molva vidgaris, May 10, 1886, ..... x 205 



Zona radiata of an abnormal egg of Solea vulgaris, showing flat papillse on the surface, . x 50 



Zona radiata of the pelagic egg with large perivitelline space with distinct punctures, . x 480 



Ovum of Gadus morrhua in the morula stage ; blastomeres boldly spherical, . . x 50 



Ovum of Pleuroneetes flesus, lateral view of the multicelled condition of the disc, . . x 35 



Plate XI. 



G. ceglefinus, transverse section through the fore-brain, 17th day, . . . . x 200 



,, transverse section through the fore part of heart, x 200 



,, transverse section posterior to fig. 2, . . . . . x 200 



„ transverse section through the fore part of the notochord, . . . x 200 



„ transverse section, lateral portion of section fig. 2, . . . x 435 



Molva vulgaris, transverse section, branchial region and heart, 11th day, . . . x 135 



,, ,, transverse section, branchial region and heart, 14th day, . . . x 135 



„ „ transverse section posterior to fig. 7, . . . . . x 135 



Gastrosteus spinachia, longitudinal vertical section through the branchial region about the 



time of hatching, . . . . . . x 135 



„ ,, longitudinal vertical section through the branchial region and oper- 

 culum, slightly more advanced than fig. 9, . . . x 135 

 G. aiglefinus, 2 days old, oblique horizontal section of the branchial region, . . x 175 

 T. gurnardus, section of a portion of the protoplasmic investment of the oil-globule, . x 450 

 Molva vulgaris, section through the oil-globule, showing pigment in the protoplasm, . x 150 

 G. aiglefinus, 17 days old, transverse section through the hind-gut, . x 230 

 „ transverse section through the base of the tail, . . . . x 230 



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Fig. 11. 

 Fig. 12. 

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 Fig. 15. 



