Plate XI. 



RegadreJhi phcenix 0. SrnM. 



(All figures from a specimen on IjDarcl the U.S. Fish-Commission 

 Steamer ' Albatross '). 



Fig. 1. Upper end of the specimen, seen from ahove. With damaged sieve- 



I>late. Nat. size. 

 Fig. "2. Upper jiortion of the same in lateral view. Nat. size. 

 Fig. 3. Small portion of dermal surface with a remnant of extremely dili- 



cate dermal latticework and with small gmnps of miusnally large 



dermalia in association with the hydranth of commensal Hydro/.oa. 



About 10 X . 

 Fig. 4. Large dermalia (prostalia marginalia) from the free edge of the ob- 



soletely developed cuff. 100 x . 

 Figs. 5, G. Strong, unequal rayed oxystanractin and oxypentactin from the 



sieve-plate border, the superior ray of which gives support to radial 



beams of the sieve-plate. .1 x . 

 Fig. 7. Small portion of the superior ray above-mentioned. 50 x . 

 Fig. S. Portion of a sieve-plate beam. aO x . 



