259 



Plate XIX. 



Fig. I. ()i>hi(ii)lalfiifi of Ophinlhrix species a. Mlsai<i, 17/VI. 14. ""/i. 



- 2. - — c. Jolo. 20 111. 14. «»/,. 



- -A. — - — — b. Taboga, Panama. .\11. 191.'>. "7i- 



Ci. - Tlic yoimg Opliiuriil has been develoiied and 



(lioi)i)e(l oil, the poslenilaUrai arms remaining in lonneetioii and slill eontinuing 

 the pelagic life. Tobago, Panama. Xll. 191.5. *^/i. 



- 7. Ophiopluteus of Ophinlhrix. species d. Somewhat restored, especially the intestinal 



traclus. Off Jolo. 20,111. 14. '"/i- 



Plate XX. 



Fig. 1. Larva of ophiollirix aitfiiilala Say, var. poecila 11. I.. Clark. Drawn from life. 40 

 liours old. -"" ,. 



2. Same, l'/., (hiys old. Drawn from life. -""I,. 



:i. Ophiopluleus opulenlus, species c. I'he young Ophiurid lias luen devc'loi)id and 

 dropped olT, the posterolateral arms remaining in connection and conliniiing pelagic 

 life. The arms are not represented in full length, ought to lie ca. 4 cm longer by 

 this magniflcation. The small swelling in llic middle to lie noticed, ^'■'/i. 



4. Same as Tig. 3, showing beginning regeneration of the larval body. *'/,. 



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

 vibratile band, anterolateral (".'iiostoral) rods. '»»/,. 



Plate XXI. 



Fig. 1. Ophiopluleus costatus, species a. ""/i. 



- 2. — — — b. ""/i. 



3. — opulentus, species a. Slightly restored. *^/,. 



Plate XXII. 



Fig. 1. OpIiitipluU-us nirospinu.s, species a. The nervous system is distinctly seen. '°/i- 



2. — — — b. Nervous system only partly distinct. '°/i- 



3. — opulenlus, — c. "/i. 



Plate XXIII. 



Fig. 1. Ophiopluleus fulcilus, species a. "-/i. 



- 2. — _ _ b. "Vi- 



- 3. — _ _ c, "Vi- 



Plate XXIV. 



Fig. 1. Ophiopluleus /ulcitus, species a. "^/j. 



2. — iindulalus. species c. ""',. 



3. - a; ill metamorphosis, '"/i. 



The details of the skeletal plates of the young Di)hiurid could not be given (piite 

 accurately by this magniflcation. The first ventral plate has appeared; in four of 

 the interradii is seen an unpaired i)late. whicli evidently represents the mouth- 

 shield. The preoral band was not very distinct and is perliaps not quite correctly 

 represented. 



Plate XXV. 

 Fig. 1. Ophiiipluleus undulalus. species a. Slightly restored. '"/,. 



2. b. Slightly restored. »"/i. The three inner arm- 



I)airs probabh still longer than represented. Ihe 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 (|uite correct: the sinuation distinct only on one side. 



33* 



