LIST OF PLATES 



XVI I 



PLATE 



XXV, 



XXVI. 

 XXVII. 



XXVIII. 



XXIX. 

 XXX. 



XXXI. 



XXXII. 

 XXXIII. 



XXXIV. 



XXXV. 



XXXVI. 



FACING PAGE 



Male and Female Dragonet (Callionymiis lyra) in pairing atti- 

 tude. The male is much larger and more brightly coloured 



than the female 310 



From a drawing in colour by James Green. 



A, Egg-capsule of Chimcera colliei, after hatching of embryo ; 

 lateral aspect. B, Same ; dorsal aspect. C, Two capsules pro- 

 truding from oviducts of female Chimcera ..... 316 



A, Spawn of Lumpsucker (Cyclopterus lumpus). B, Eggs of 

 Gar-fish (Rhamphistoma belone) attached to sea-weed. C, 

 Butter-fish guarding its clump of spawn ..... 324 

 A and B, After Photos from nature by Ehrenbaum. 

 C, Photo, R. Vallentin, Esq. 



Nest of Sea-stickleback (Gasterosteus spinachia) with clump of 

 spawn in the centre. The fronds of weed are bound together by 

 a thread spun by the fish ........ 327 



Stages in the metamorphosis of Leptocephalus brevirostris, the 

 larva of the Common Eel ........ 355 



A, Upper, right, side of abnormal Turbot, 4*4 cm. long, captured 

 on the coast of Cornwall in 1906. B, Lower, left, side of same. 



C, Lower side of normal Flounder after exposure to light for 14 

 months 366 



A, Synodontis batensoda, a fish of the Nile which habitually 

 swims in an inverted position. B, The Four-eyed Fish, Ana- 

 bleps tetrophthalmus. C, Myctophum remiger, an oceanic fish 

 with luminous organs. D, Ipnops agassizii .... 376 



A, Ceratodus australis, the Australian Lung-fish. B, Sacco- 

 branchus fossilis. C, The Electric Eel, Gymuotus electricus . 432 

 B, Photo, Lewis Medland. 



A, Hag-fish (Myxine glutinosa), anterior end dissected to show 

 the six rounded gill-pouches, etc. B, Hag-fish opened to show 

 hermaphrodite generative organ in the male condition. C, 

 Eggs of Californian Hag-fish connected by their polar filaments. 



D, Polar filaments of same enlarged. E, F, Ends of single 

 filaments more enlarged ........ 442 



A, Amphioxus external surface, left side. B, Amphioxus dissected. 



C, Larva of Amphioxus enlarged, lying on left side. D, A soli- 

 tary Ascidian (Ascidia mentula), left side, external surface. E, 

 The same, internal structure ....... 458 



An Appendicularian (Folia athiopica), from the Sargasso Sea. 

 B, Portion of a specimen of Botryllns, showing three systems 

 of zooids. C, A compound individual (gemmarium) of Pyrosoma. 



D, Open end of same. E, Three zooids of same enlarged. F, 

 Salpa democratica, a sexual individual . 1 . . , 482 



A, B, C, Three stages in the metamorphosis of a simple Ascidian. 

 D, Balanoglossus kowalevskii. E, Cephalodiscus dodecalophus, 

 ventral view .......... 486 



