234 



ZOOLOGY 



SECT. 



Reproduction and Development. Most Teleostomi are 

 oviparous, the eggs being impregnated after they are laid, but 

 in some Teleostei, such as the Viviparous Blenny (Zoarces), internal 

 impregnation takes place ; the young are developed in the hollow 

 ovary and are brought forth alive. Many 

 instances of parental care of the young are 

 known, the most familiar being that of the 

 male Stickleback (Gasterosteus), which con- 

 structs a nest of weeds, fastened together 

 by a glutinous secretion of the kidneys, and 



FIG. 909. Segmentation in Acipenser (A), Amia (B), 

 and Lepidosteus (C). A 1, 2, and 3, B 1 and 2, 

 C 1 and 2 are views of the apical pole ; the remaining 

 figures are side views. (From Graham Kerr, after 

 Dean, Whitman, and Eycleshymer.) 



jealously guards the developing young. In the Sea-horse (Hippo- 

 campus] and the Pipe-fish (Syngnathus) the young are developed 

 in a pouch (Fig. 892, brd. p.) on the abdomen of the male. In the 

 Siluroid Aspredo the eggs are pressed into the soft spongy skin of 

 the belly and thus carried about by the parent. The ova are 



