DEVELOPMENT AND LIFE-HISTORIES OF TELEOSTEAN FISHES. 939 
Fig. 9. Heart and other organs of 7. gurnardus, just hatched, seen from above, June 2, 1886, ° . x 90 
Fig. 10. Young pleuronectid (unknown sp.), April 7, 1887, front face view, ; . x 50 
Fig. 11. 7. gurnardus, 4th day, transverse section divongh the heart, with mesoblast ies) : x 600 
Puate IX. 
Fig. 1. Anterior end of T. gurnardus, 3rd day, June 19,1886, F j j : x 100 
Fig. 2. Molva vulgaris, 4 days old, May 12, 1886, : : : , : : x 25 
JO SE © op ; 5 days old, May 13, 1886, : x 25 
Fig. 4. Head and anterior region of P. platessa, 8 mm. in length, and 4 ae old, eal 22, 1886, . x 40 
Fig. 5. Anterior end of 7. gurnardus, 8th day, June 24, 1886, . é : : , x 55 
Fig. 6. G. eglefinus, branchial and mandibular cartilages, April 20, 1886, ; : : x 200 
Fig. 7. Mandible of G. eglefinus, 10 days old, 5 x 140 
Fig. 8. Blastoderm of 7. gurnardus at the stage of About sixty Pinson: um inte. Blaatomanie 
spaces apparently filled with fluid, ; ‘ : : : 4 x 40 
Fig. 9. Molva vulgaris, margin of dise and nuclei of neniinse : x 450 
Fig. 10. Gadus eglefinus, 24th hour; the figure shows some marginal cells of the blastoderany anak a 
portion of the nucleated Fehibinet : ° ‘ : : ‘ ° x 415 
PiatE X. 
Fig. 1. Slightly oblique view of the head of an advanced larva (15th day) of Trigla gurnardus, . x 40 
Fig. 2. Trigla gurnardus, showing pigment in pectoral fin and visceral anatomy, 16th day, . Magnified 
High 2050s, os ventral view of same, 16th day, ‘ : , : . Magnified 
1 BL op A advanced embryo, 17th or 18th day, : 5 - Magnified 
Fig. 4. Blastodise of Trigla gurnardus at the 6th hour, viewed from above ; third furrow nearly 
completed. Oil-globule (0g) seen below, é . : : F x 80 
Fig. 5. Larva of Gadus morrhua, ventral view of head, May 11, 1886, : . . Magnified 
Kiss da. 5; 5 = dorsal view of head, May 11, 1886; the heart is adrewtad by te 
dotted lines, ‘ c ; : . Magnified 
Fig. 6. Opercular aperture of Molva vulgaris, May 10, 1886, 5 ; x 205 
Fig. 7. Zona radiata of an abnormal egg of Solea vulgaris, showing flat aan on “the surhioes : x 50 
Fig. 8. Zona radiata of the pelagic egg with large perivitelline space with distinct punctures, : x 480 
Fig. 9. Ovum of Gadus morrhua in the morula stage ; blastomeres boldly spherical, 4 : x 50 
Fig. 10. Ovum of Plewronectes flesus, lateral view of the multicelled condition of the disc, . : x 35 
Puate XI. 
Fig. 1. @. eglefinus, transverse section through the fore-brain, 17th day, . ; : ¢ x 200 
Fig. 2. 3 transverse section through the fore part of heart, ; ; : : x 200 
Fig. 3. transverse section posterior to fig. 2, . ; ; : x 200 
Fig. 4. e transverse section through the fore part of the safvarilan?. : : : x 200 
Fig. 5. 3 transverse section, lateral portion of section fig. 2, . : : : x 435 
Fig. 6. Molva vulgaris, transverse section, branchial region and heart, 11th day, . : : x 135 
Tie, Uo 5 transverse section, branchial region and heart, 14th day, . ; : x 135: 
IMs, hp P transverse section posterior to fig. 7, : x 135 
Fig. 9. Gastrosteus spinachia, longitudinal vertical section through the ianetials region aout tp 
time of hatching, : : x 135 
Fig. 10. 5 Fi longitudinal vertical section Agus the prenehit region and oper- 
culum, slightly more advanced than fig. 9, : : 5 x 135 
Fig. 11. G. eglefinus, 2 days old, oblique horizontal section of the branchial region, ¢ é x 175 
Fig. 12. 7. gurnardus, section of a portion of the protoplasmic investment of the oil-globule, : x 450 
Fig. 13. Molva vulgaris, section through the oil-globule, showing pigment in the protoplasm, 0 x 150 
Fig. 14. G. eglefinus, 17 days old, transverse section through the hind-gut, : : : x 230 
Fig. 15. 3 transverse section through the base of the tail, é : 5 : x 230 
