522 EDWIN S. COODEIOH. 



Fig. G3.— FiMgmeiu of the same. Cam. x 150. 



Fig. GJ-. — Fragment, of a scale of Pholidopliorus. Cam. x 150. 



Fig. G5a. — Distal segment of the endo-skeletal (in-snpport of the dorsal 

 candal fui of Undina penicillata, with its related dermal ray. Enlarged 

 and somewhat diagrammatic. 



Fig. 65b. — Small portion of a dermal ray of the same, showing the spine- 

 like denticles, mnch enlarged. 



Fig. CG. — Section througli the caudal fin of Hajmulon Scudderi, cutting 

 across the dermal rays near the edge of the fin. Cam. Enlarged. 



Fig. 67. — Section through the same, cutting the dermal rays longitudinally 

 and nearer the base of the fin. The separate overlying scales are here well 

 shown. Cam. Enlarged. 



