DEVELOPMENT AND LIFE-HISTORIES OF TELEOSTEAN FISHES. 



935 



EXPLANATION OF PLATES. 



[The Plates were drawn under the impression that they would be published by the Fishery Board for Scotland. 

 This was found to be impracticable. The larger share of the cost of their publication was borne by the Royal 

 Society of Edinburgh, part of the balance being defrayed by a grant from the Fishmongers' Company of 

 London.] 



Plate I. 



Fig. 



1. 



Fig. 



2. 



Fig. 



3. 



Fig- 



4. 



Fig. 



5. 



Fig. 



6. 



Fig. 



7. 



Fig. 



8a 



Fig. 



8b. 



Fig. 



9. 



Fig. 



10. 



Fig. 



11. 



Fig. 



12. 



Fig. 13. 



Fig. 

 Fig. 



Fig. 



Fig. 



Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 



14. 

 15. 



16. 

 17. 



18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 



Fig. 26. 



Ovum of Liparis montagui, pinkish in colour and with pitted capsule, 

 Ovum of Coitus hubalis (?), showing boldly corrugated zona radiata, 

 Ovum of Cottus scorpius, ....... 



Ovum of Liparis montagui, with pitted capsule. Adjacent ova are attached by strong 

 facets, ......... 



Fertilised ovum of Clupea sprattus, ..... 



Ovum of Zeugopterus punctatus, in ripe (unfertilised) condition, 



Fertilised ovum of Trigla gurnardus, cells at the edge of the blastoderm, . 



T. gurnardus, pigment-corpuscles present at the closure of the blastopore, . 



,, pigment-corpuscles present at the closure of the blastopore, 



Spermatozoa of Trigla gurnardus, ..... 



Ova of Molva vulgaris, floating in calm water, showing a regular disposition 



next the central oil-globule indicates the blastoderm, 

 0. ozglefinus, micropyle and accessory structure in oblique view, 



„ micropyle in profile, ...... 



a, external crater ; b, smaller internal orifice ; c, conical internal elevation. 

 „ micropyle in profile, another view of a later condition in an ovum 4-£ hours 



after fertilisation, ....... 



„ micropyle in profile, 6 hours after fertilisation, . 



,, micropyle and accessory structure, oblique view, . . . . 



[The artist has placed the accessory structure above instead of at the side of the 

 micropyle.] 

 T. gurnardus, surface view of an abnormal zona radiata, . 



a, b, c, d, and e, successive changes observed in the polar nuclear body, apparently the 

 union of male and female pronuclei in the ovum of T. gurnardus: a, at 25 mins. 

 b, 30 mins.; c, 38 mins.; d, 46 mins.; e, side view of another similar body, 

 Pleuronectes microcephalus, surface view of dotted and reticulated zona radiata, 

 Trigla gurnardus, zona radiata with linear arrangement of dots, 

 Pleuronectes platessa, zona radiata showing dotted structure, 

 Liparis montagui, nearly ripe ovum, with reticulated capsule and oil-globule, 

 Oblique view of the same. 

 Agonus cataphractus, reticulated zona radiata, ..... 



Cyclopterus Imnpus, zona with dots of two sizes, ..... 



Anarrhichas lupus, zona in section, stained with hsematoxylin, which affects only a thin 

 line a, . . . . . . . . 



Ovum of Solea vulgaris, viewed from above, so as to show the ring formed by the groups of 

 small oil-globules ; the rim of the blastoderm is observed internally, and certain parasitic 

 infusoria are seen externally, July 12, 1888, ...... 



x 50 



x 24 

 x 24 



x 40 

 x 56 

 x 56 

 x 90 

 x205 

 x205 

 Highly magnified 

 The ring 



x about 10 

 x415 

 x205 



x400 

 x500 

 x510 



x205 



x 75 



x350 



x300 



x415 



x 156 



x250 



x205 



x435 



x about 40 



Fig. 

 Fig. 



Plate II. 



1. Pleuronectes flesus, vertical section through middle of blastoderm, 2nd day, April 7, 1886, x 175 



2. ,, ,, vertical section through middle of blastoderm, nearer the margin than 



in fig. 1, . . . . . . . x 175 



