CATOSTEOMI 



63s 



Siingnatlms, PenetopUryx, Xannocampus, Stigmatophorus, H'ppo- 

 campus), in a groove under the tail {Fhyllopieryx), or in a groove 

 on the abdomen {Doryiclithys, Coelonotus, NeropMs, Gastrotoceus). 



Fig. 387. — Hljypocampus guttulatiis. 

 Male, showing brood-pouch (mp). 

 a, Anus ; h.a, branchial aperture. 



Fia. 388. — Phyllopteryx eques. 

 i nat. size. 



An Australian species of Syngnathus has been described by 

 E. P. Eamsay under the name of S. intestinalis, from its living 

 inside Holothurians, in the manner of Fierasfer, and G. Lunel has 

 observed a Doryiclithys to offer a similar instance of inquilinism. 



One of the most remarkable types of Syngnathids is Pliyllopteryo:, 

 from Australia. The spines and knobs of the head and body are 

 furnished with dermal appendages, which closely imitate the 

 fucus among which they live. 



Fam." 11. Pegasidae. — Body short or moderately elongate, 

 encased in an exoskeleton forming rings. Anterior vertebrae 

 not elongate ; no ribs. Snout produced beyond the mouth, 

 which is small, inferior, and toothless; no praeoperculum, no 

 symplectic ; gill-opening very small ; gills pectinated. A single 

 dorsal fin. Pectoral fins large, horizontal ; ventrals reduced to 

 one or two filamentous rays, behind the scapular arch. Air- 

 bladder absent. 



