D38 



PROFESSOR W. C. M'INTOSH AND MR E. E. PRINCE ON 



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Fig. 7. Molva vulgaris, aboral end of notochord, 10th day, 



Fig. 8. ,, ,, showing early pigment, 7th day, May 4, 1886, 



Fig. 9. „ „ embryo still further advanced, 8th day, May 5, 1886, 



Fig. 10. ,, ,, ventral aspect of embryo, .... 



Fig. 11. Pleuronectes limanda, ovum showing protoplasmic reticulations, 



Plate VI. 

 G. morrliua, surface view of ear, May 10, 1886, ...... 



T. gurnardus, surface view of ear, 7th day, June 22, 1886, .... 



The anterior edge is on the right, and the dorsal is superior. 

 „ longitudinal vertical section of the otocystic region; 3 days old, June 1, 1886, 



„ transverse section of the same region; 3 days old, June 1, 1886, 



G. aiglefinus, anterior end of larva, ....... 



Larva of T. gurnardus, from the dorsum, June 15, 1886, ..... 



Pleuronectes platessa, head of larva 2 days old, May 1886, .... Highly 



T. gurnardus, sensory organ in integument behind the cephalic region, May 12, 1886, 

 „ sensory organ in integument behind the cephalic region, June 24, 1886, 



Transverse section through the otocystic region of larva of G. ceglefinus, 19 th day after 

 hatching, ......... x 



Section of the same region, ........ 



Otolith of Cottus scorpius, -£% in. long (-188 inch), showing strongly stained core and un 

 stained concentric stratum, ........ 



Plate VII. 



G. aiglefinus, transverse section, 13th day (7 hours before hatching), April 14, 1886, 

 „ transverse section, 14th day after fertilisation (just emerged), 



,, transverse section, 3rd day after hatching, April 24, 1886, 



„ transverse section, posterior to fig. 3, 



„ transverse section through mid-gut and diverticulum (swim-bladder), 



„ transverse section, 2nd day out, April 24, 1886, 



,, transverse section (section succeeding fig. 6), ... 



„ longitudinal horizontal section, 3rd day out, March 23, 1886, 



Molva vulgaris, 6 days old, ventral aspect of the alimentary canal, 

 T. gurnardus, longitudinal vertical section of the alimentary canal, 17th day, July 8, 1885 



„ dorsal view of pectoral fin of embryo before hatching, May 27, 1886, 



G. morrliua, section of the anal portion of the gut, 6th day out, May 4, 1886, 

 Molva vulgaris, longitudinal horizontal section through the hind-gut, 2 days old, May 7 

 1886, ...... 



„ „ longitudinal horizontal section at a lower plane, 



,, „ longitudinal horizontal section half-way down marginal fin 



„ „ longitudinal horizontal section of the anal opening, on a lower plane than 



fig- H, 



Plate VIII. 

 Undetermined larva (d) with oil-globule (see p. 861), 



G. aiglefinus, 8th day after fertilisation, view of the heart, 8.50 p.m., March 30, 1886, 

 T. gurnardus, from right side, focussed deeply: pew, anterior pericardial wall, July 18, 

 1886, 



„ ear, eye, and other organs, ....... 



„ 1st day, slightly oblique view of the cardiac region from below, June 1886, . 



Head and anterior region of T. gurnardus, newly hatched, .... 



Head of G. aiglefinus, 7th day, April 30, 1886, ...... 



Branchial region of T. gurnardus, newly hatched, ..... 



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x 55 



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x210 



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t magnified 



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about 300 



x230 



x750 



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x600 



x 25 

 x210 



xl56 

 xl56 

 xl56 

 x 65 

 x 65 

 x 90 



