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PHYLUM CHORDATA 



215 



The right and left bars of the fifth branchial arch are usually not 

 fused. 

 This immense group includes the greater number of marine 



FIJ. 839. SsbistespsrsDides. br. m. branchioategal msmbrane ; d. f. spiny portion^of 

 dorsal fln ; d. /'. soft portion ; me. maxilla ; op. opercular ; pet. f. pectoral fin ; p.mx. pre- 

 maxilla ; pr. op. pre-opercular ; pv.f. pelvic fin-; v.f. spiny portion of ventral fin ; v.f. soft 

 portion. (After Richardson.) 



fishes (Fig. 889), as well as many fresh-water forms : the Perch, 

 Stickleback, Sea-bream, Mullet, Mackerel, and G-urnard may be 

 specially mentioned. 



Sub-order d. PJiaryngognathi. 

 Teleostei in which the right and left bars of the fifth branchial 



Fro. 890. Labrichthys psittacula (Wrasse), d. f. hard dorsal fin ; d.f. soft dorsal, lp. 

 lips ; pct.f. pectoral fin ; po.f. pelvic fin ; v.f. ventral fin. B, inferior pharyngeal bone of 

 Labrichthys. (A, after Richardson ; B, after Owen.) 



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