LIST OF THE WOOD-CUTS. 



IX 



and the 



Fig. 43, seen from above ........ 



Fig. 42, seen from the broad side ....... 



Pleurobraehia, imnudiatily l>ffore the escape from the egg . 



Fig. 44, somewhat less magnified, to sliow the relative size of the egg-case 



embryo .......... 



Fig. 44, seen from tlie aetinal pole ....... 



Pleurobraehia swimming freely about, seen from the broad side . 



Somewhat less advanced than Fig. 47, showing the lateral tubes from the narrow 



side, as a prolongation of the ambulacral cavity .... 



Pleurobraehia about in state of Fig. 47, seen from the aetinal pole . 

 Adult Pleurobraehia, natural size, from broad and narrow side . 

 Adult Pleurobraehia in a natural attitude, natural size . 

 Young InYi.\ iklskola, seen from tlie narrow side .... 



Fig. 52, seen from the abaetinal pole ...... 



Young Idyia, with distinct ambulacral tubes, seen from the narrow side 



Fig. 54, seen from the abaetinal pole 



Somewhat more advanced than Fig. 54, seen from the broad side 



The long chymiferous tubes extend to the level of the aetinostome .... 



The long chymiferous tuljcs have united with the lateral tubes ; first trace of tlie 



ramifications of the long tubes ......... 



The short andjulaera ha\e nearly united with the circular tube .... 



The circuit is now complete between the short and long aud)ulacra ; the s])urs or 



ramifications of tlie chymiferous tubes are numerous, resembling somewhat 



those of the adult ........... 



Fig. 57, seen from the abaetinal pole ...... 



Adult Idyia, reduced in size one half. (L. Agassiz.) .... 



Idyopsis Clarkii, seen from the broad side. (L. Agassiz.) . 



Fig. 63, seen from the abaetinal pole. (L. Agassiz.) .... 



Profile view of Aurei.ia flavidula, much reduced. (L. Agassiz.) 

 Abaetinal view of Aurelia flavidula. (L. Agassiz.) .... 



Cyanea arctics, very much reduced. (L. Agassiz.) . 



Pelagia cyanella. (L. Agassiz.) 



Dactylometra quixquecirr.4, reduced about one fourth . 



Profile view of Campaxella paciiyder.ma 



Aetinal view of Fig. 70 ........ . 



A somewhat more magnified view of Fig. 71 



A'iew of part of the aetinal surface ....... 



Magnified profile view of portion of the base of a tentacle . 



View of basal portion of tentacle, seen from above 



Profile view of Trachyxema camtscuatici'M 



One of the genital organs ......... 



Section of Traehynema ......... 



Chymiferous cavity at the end of the gelatinous proboscis 



View of Traehynema fro'n above ........ 



Adult female Trachyxema dioitale, seen in profile . 



Aetinal view of the veil and circular tube of a very young Traehynema 



Profile view of a part of the cireidar tulie ..... 



Profile view of a young Traehynema, about one eighth of an iucli in lici; 



Somewhat more advanced than Fig. 84 . 



Young Traeliynema, measuring over one third of an inch in height 



? LiKiopE SCUTIGERA. (L. Aga.ssiz.) 



II.\LICLYSTUS AURICULA, Seen from the aetinal pole .... 



Different attitudes of Haliclystus auricula, attached to eel-grass 

 Young Haliclystus auricula, magnified ....... 



TiAROPsis DI.VDEMATA, natural size. (L. Agassiz.) 



Young Tiaropsis, having twenty-fi)ur tentacles ..... 



Young Tiaropsis, having forty tentacles. (L. Agassiz.) . 



Two marginal tentacles of Oceania laxcuida, witli a ])ortiou of the cii 



Magnified view of the aetinostome ....... 



lit 



•cular tulie 



30 

 30 

 31 



31 

 32 

 32 



33 

 33 

 33 

 33 

 36 

 36 

 36 

 37 

 37 

 37 



37 

 37 



37 

 38 

 38 

 39 

 39 

 42 

 42 

 45 

 47 

 48 

 53 

 53 

 53 

 53 

 63 

 53 

 56 

 56 

 66 

 56 

 56 

 57 

 57 

 57 

 58 

 68 

 59 

 60 

 63 

 63 

 63 

 69 

 69 

 69 

 70 

 71 



