LIST OF THE WOOD-CUTS. 



[Note. — Uuless otherwise credited, the Figures are drawn from nature by Alex. Agassiz.] 



Young BoLiXA ALATA, Seen from the narrow side ..... 



Bolina in state of Fig. 1, seen from the broad side ..... 



Somewhat younger than Fig. 1, seen from the abactinal pole 



Young Bolina, seen from the abactinal pole, older than previous figures 



Formation of lateral tubes in young Bolina ...... 



Bolina in which lobes begin to appear, seen from the narrow side, same state as 



Somewhat more advanced than Fig. G, seen from the actinal side 



The tentacular ambulacra have united, and the lobes project well beyond the 



ing of the mouth .......... 



About in the condition of Fig. 1, seen from the broad side .... 



Somewhat younger than Fig. 8, seen from the broad side .... 



Fig. 8, seen from the broad side 



Bolina showing first appearance of the auricles, seen from the broad side . 

 Bolina in stage of Fig. 1 2, seen from the narrow side ..... 



Fig. 13, seen from the actinal pole ...... 



Adult Bolina, seen from the broad side. (L. Agassiz.) . 



Fig. 15, seen from the narrow side. (L. Agassiz.) . 



Bolina, seen from the actinal pole. (L. Agassiz.) .... 



Bolina, seen from the abactinal pole. (L. Agassiz.) . 

 Boi,ix.\ viTRE.\, seen from the broad side. (L. Agassiz.) . 

 lIxEMiOPSis Gardeni, Seen from the broad side. (L. Agassiz.) 

 Fig. 20, seen from the actinal pole. (L. Aga.s,<iz.) 

 MxEMiOPSis Leidyi, seen from the broad side .... 



Same as Fig. 22, seen from the narrow side ...... 



A part of the tentacular apparatus near the opening of the actinostome 

 Lesueuria iiyboptera, seen from the broad side .... 



Fig. 25, seen from the narrow side ...... 



The same, seen from the abactinal pole ...... 



Seen from the actinal pole ........ 



Adult JIertexsia ovum, seen from the broad side 



Young Mertensia, seen from tlic broad side .... 



Fig. 30, seen from the abactinal pole ...... 



Somewhat more advanced Mcrtcnsia, seen from the narrow side 

 Same as Fig. 32, seen from the actinal pole ..... 



Still more advanced Mertensia, seen from the narrow side . 

 Fig. 34, seen from the actinal pole ..... 



Still further advanced Jlertensia, seen from the broad side 



Young Mertensia, about in the same condition as that of the preceding figure 



from the narrow side ....... 



Young Pi,ErROBU.\cinA hiiododactyla, seen from the broad side 

 Same as Fig. 38, seen from the nan-ow side .... 



Same as Fig. 38, seen from below ....... 



Somewhat more advanced, seen from the broad side . 



Fi£r.4 



opcn- 



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