259 



Plate XIX. 



Fig. 1. Ophiopluteus of Ophiolhri.r species a. Misaki, 17/VI- 14. 80 /i. 



2. c. Jolo. 2d III. 11. "" ,. 



3. b. Taboga, Panama. XII. 191.V 6 %. 



_ tai 



The young Ophiurid has been developed and 



dropped nil. the posterolateral arms remaining in connection and slill continuing 

 I lie pelagic life. Tobago, Panama. XII. 1 !)!.">. l|3 /,. 



7. Ophitipluti'iifi of Ophiiilhri.r. species d. Somewhat restored, especially the intestinal 

 tractus. Oil Jolo. 20/111. 14. 80 /i- 



Plate XX. 



Fig. 1. Larva of Ophiolhri.r anr/utala Say. var. poecila 11. L. Chirk. Drawn from life. 40 

 hours old. 200 /i. 



2. Same, I 1 ., days old. Drawn from life. 20t> /i- 



3. Ophiopluteus npulrntus. species c. The young Opliiurid has been ileveloped and 

 dropped off, the poslerolaleral arms remaining in connection and continuing pelagic 

 life. The arms are nol represented in full length, ought to be ca. 1 cm longer by 

 this magnification. The small swelling in the middle lo be noticed. 43 / t . 



1. Same as lii<. 3, showing beginning regeneration of the larval body. t3 / l . 



.">. Same specimen as fig. 4. more magnified. Showing beginning formation of mouth, 

 vibratile band, anterolateral (?posloral) rods. 180 / l . 



Plate XXI. 



Fig. 1. Ophiopluteus costatus, species a. 90 /i. 



2. b. 6 /i. 



3. opulentus, species a. Slightly restored. 85 /i. 



Plate XXII. 

 Fig. 1. Ophiopluteus retrospinus, species a. The nervous system is distinctly seen. 80 /i. 



2. b. Nervous system only partly distinct. 90 /i- 



3. opulentus, c. "/,. 



Plate XXIII. 

 Fig. 1. Ophiopluteus fulcitux, species a. 62 / t . 



2. b. Il5 /i- 



3. c. /,. 



Plate XXIV. 



Fig. 1. Ophinplnlfiix /ulcitim. species a. " ,. 



2. undulaliifi. species c. 90 /i- 



a; in metamorphosis. '"/,. 



The details of the skeletal plates of (lie young Ophiurid could not be given quite 

 accurately by this magnification. The lirst ventral plate has appeared: in four of 

 (he interradii is seen an unpaired plate, which evidently represents the mouth- 

 shield. The preoral hand was nol very distinct ;mcl is perhaps nol (mile correctly 

 represented. 



Plate XXV. 



Fig. 1. Opliiiipliiletts iiiiiiuldliix, species a. Slightly restored. 90 /i- 



b. Slightly restored. ""/,. The three inner arm- 

 pairs probably still longer than represented. The widening on the ends not distinct, 

 drawn only from analogy with the other species of this type. The shape of the 

 preoral band perhaps not quite correct: the sinuation distinct only on one side. 



33* 



