O FISH GALLERY. 



" Ammoccete" (1063), or more popularly as Pride or Sand-piper. 

 The Ammocoete differs from the adult in having no tongue or 

 teeth, in possessing a hood-like anterior lip instead of an oral 

 sucker, in the large size of the internal or pharyngeal apertures of 

 the gill- pouches, and in the fact that the respiratory part of the 

 pharynx is not shut off by a horizontal partition from the food 

 channel. 



In South America and Australia the Lampreys are represented 

 by the genera Mordacia and Geotria (1064) . 



In the Hyperotreta the external nasal aperture is situated at the 

 extremity of the snout, and from the inner end of the nasal sac 

 there leads back a tube which opens into the roof of the pharynx 

 (see dissection 1066). There are barbels on the snout. The skin 

 is capable of secreting enormous quantities of glutinous slime. 

 The eggs are large (see 1068). In Bdellostoma (1067) each gill- 

 pouch has its own aperture on the side of the body, but in the 

 Hag-fish, Myxine, 1065, exhalent tubes from the pouches lead back 

 and open together. Bdellostoma occurs plentifully in the bays 

 along the Pacific coast of America ; Myxine is found widely 

 distributed in the temperate zones of the northern and southern 

 hemispheres. Both feed on fish, and Myxine not infrequently 

 bores its way into the abdominal cavity of the Cod. 



PISCES (Fishes). 



The Lancelet and Lampreys having been disposed of, there 

 remain for consideration the true Fishes or Pisces, a class of the 

 Vertebrata ranking equal with the Amphibia (Frogs and Newts), 

 Reptilia (Turtles, Crocodiles, Lizards, Snakes), Aves (Birds), and 

 Mammalia (Mammals, e.g. Rabbit, Dog, Horse, Man). 



Fishes are Vertebrate animals with a distinct and hinged lower 

 jaw, passing their whole life in water (with a few exceptions), and 

 possessing common distinctive characters in those systems of their 

 organization which are in direct relation to their aquatic mode of 

 life, namely, in the organs of respiration and locomotion. The 

 respiratory organs are gills, groups of delicate vascular filaments 



