REVIEW OF HIPPOCAMPUS — GINSBURG 



589 



Campeche, Mexico, A. S. Pearse; July 13, 1932 (Univ. Michigan 

 Mus. no. 102819). 



Total number of specimens studied, 24; 13, with a broad pouch or 

 at least a rudiment of one, 21 to 34 mm long; 11, without any trace 

 of a brood pouch, 17 to 30 mm long. Some of the larger specimens 

 have the brood pouch fully developed. Judged by the material 

 examined, the maximum size attained by regulus is considerably 

 below that of zosterae. All the specimens I obtained at Cat Island 

 were picked out from seaweed landed by a small drag seine in shallow 

 water on a sandy shore. 



Table 5. — Frequency distribution of some meristic characters of Hippocampus 

 zosterae and regulus according to locality 



' Including four specimens from Newfound Harbor Key. 

 ' Including one specimen from Apalachicola. 



» Two specimens from Captiva Pass and two from Pensacola had 10 incomplete trunk segments and are 

 included with the others having 10 segments. 



HIPPOCAMPUS ZOSTERAE Jordan and Gilbert 



Hippocampus zosterae Jordan and Gilbert, Proc. U. S. Nat. Mus., vol. 5, p. 265, 



1882 (Laguna Grande, Pensacola, Fla.) 

 Hippocampus zosterae Bean, U. S. Nat. Mus. Bull. 27, p. 430, 1883 (Pensacola, 



Fla.). 

 Hippocampus rosamondae Borodin, Bull. Vanderbilt Oceanogr. Mus., vol. 1, 



art. 1, p. 16, pi. 1, fig. 3, 1928 (Cuba). 



Diagnosis. — First caudal segment usually quadrangular, very often 

 hexangular; last trunk segment usually octangular, often hexangular 

 (when last trunk segment is hexangular the first caudal in the same 

 specimen is also usually hexangular); penultimate trunk segment 

 nearly always septangular (incompletely novemangular in tv/o out of 

 59 specimens examined). In other words, usually only one extra 

 plate for the support of the dorsal, in most cases on the last trunk 

 segment, often on the first caudal segment, infrequently two extra 

 plates (on one side only of the two specimens noted) ; or, upper ridges 

 of trunk and tail overlapping on one segment, infrequently on two, 

 rarely on none (in one out of 59 examined, this specimen being without 

 extra plates). (The variation in the structure of the first caudal 



