REVIEW OF HIPPOCAMPUS — GINSBURG 



547 



Diagnosis. — First caudal segment hexangular and last trunk 

 segment octangular (in all eight specimeiis examined); penultimate 

 trunk segment usually septangular, often novemangular (completely 



r 



Figure ti?.— Hippocampus europaeus, dicawn from the type, a male 95 mm long from La Rochelle, France 

 U.S.N.M. no. 28544. Length of specimen as drawn, 55 mm. Color faded. 



septangular in five and novemangular in two, incompletely novem- 

 angular in one). In other words, an extra plate always present on 

 first caudal and last trunk segment, often also on penultimate trunk 



