REVIEW OF HIPPOCAMPUS — GINSBURG 



573 





always octangular; penultimate trunk segment usually septangular, 



sometimes novemangular (completely novemangular in two speci- 

 mens and incompletely so in one out of 12 examined). In other 



words, usually first caudal 



and last trunk segments 



only with an extra plate 



for the Lsupport of the 



dorsal, infrequently miss- 

 ing on first caudal seg- 

 ment and sometimes 



present on penultimate 



trunk segment; or, upper 



ridges of tail and trunk 



usually overlapping on 



two segments, sometimes 



on three. Trunk segments 



normally 11 (in 11), some- 

 times 12 (an incomplete 



twelfth segment in one). 



Caudal segments usually 



35 or 36, varying 84 to 



37. Dorsal rays modally 



17, varying 15 to 18. 



Pectoral rays usually 15 or 



16, varying 15 to 17. 



Tubercles on upper ridge 



of trunk evident in small 



specimens (one male 46 



mm long and two females 



50 and 58 mm examined), 



but quite low, compara- 

 tively much lower than 

 usual in specimens of 

 hudsonius or punctulatus 

 of similar size; in large or 

 medium-sized specimens 

 obsolescent or nearly ob- 

 solescent, being sometimes 

 indicated as a slight, broad- 

 ly wavelike rise (next sizes 

 examined after the small 

 specimens are a male 74 and a female 93 mm). Coronet medium 

 in small and medium-sized specimens, very low in large ones. Trunks 

 unusually slender; snout conspicuously long. Filaments absent on 

 tubercles and coronet of large and medium-sized specimens; present 



Figure 55.— Hippocampus reidi, drawn from the type, a male 

 121 mm long from Grenada, British West Indies; U.S.N.M, 

 no. 86590. Length of specimen as drawn, about 91 mm. 



