CATOSTEOMI 



635 



Syngnathus, Penetoptcryx, Nannocampus, Stigmatophorus, Hippo- 

 campus], in a groove under the tail (Phyllopteryx), or in a groove 

 on the abdomen (Doryiclitliys, Coelonotus, Neropliis, Gastrotoceus). 



FIG. 387. Hippocampus guttulatus. 

 Male, showing brood-pouch (mp). 

 a, Anus ; b.a, branchial aperture. 



FIG. 388. Phyllopteryx eques. 

 i nat. size. 



An Australian species of Syngnathus has been described by 

 E. P. Kamsay under the name of 8. intestinalis, from its living 

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

 observed a Doryichthys to offer a similar instance of inquilinism. 



One of the most remarkable types of Syngnathids is Phyllopteryx, 

 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. 



