Proceedings U. S, National Museum, Vol. X, 1887.— Rathbun 



1 dte. "pSf ''™''''' ^- '''^- '' ^'°''"'''''' '^'^'"""^ ^"^ accessory hook, x 45 dia. '; 5, furca, x 



Perissojms com mim is Rathbun, sp. nov Fi 

 som Rathbun, dorsal view, .x 14 dia. (p. 500.) 



6, typical form, dorsal view, x 14 dia. ; 7, var. Stimp- 

 (Figs. 6 and 7 were drawn by Mr. A. H. Baldwin; the remainder by the author.; 



