LIST OF THE WOOD-CUTS. ix 



Fig. 43, seen from above 80 



Fig. 42, seen Irom the broad side 30 



Pleurobracliia, iinmediatL-ly before the escape from the egg ..... 31 

 Fig. 44, somewhat less magiiilicd, to show the relative size of the egg-case and the 



embryo ............. 31 



Fig. 44, seen from the actinal pole 32 



Pleurobracliia swimming I'reely about, seen from the broad side .... 32 

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



side, as a prolongation of the ambulacral cavity 33 



Ph'urobrachia about in state of Fig. 47, seen from the actinal pole .... .'{.'5 



Atlult Ph'urobrachia, natural size, from broad and narrow side .... 33 



A(hilt Ph'urobrachia in a natural attitude, natural size 33 



Young Idyia roseola, seen from the narrow side 36 



Fig. 52, seen from the abactinal pol(i ......... 36 



Young Idyia, with distinct ambulacral tubes, seen from the narrow side . . 36 



Fig. 54, seen from the abactinal pole 37 



Somewhat more advanced than Fig. 54, seen from the broad side . . . 37 

 The long chymlferous tubes extend to the level of the actinostome . . . .37 

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



ramifications of the long tubes 37 



The short ambulacra have nearly united with the circular tube . . . . 37 

 The circuit is now complete between the short and long ambulacra ; tlie spurs or 



ramifications of the chymiferous tubes are numerous, resembling somewliat 



those of the adult . • • 37 



Fig. 57, seen from the abactinal pole ......... 38 



Adult Idyia, reduced in size one half. (L. Agassiz.) 38 



Idyopsis Clarkii, seen from the broad side. (L. Agassiz.) 39 



Fig. 63, seen from the abactinal pole. (L. Agassiz.) 39 



Profile view of Aurelia flavidula, much reduced. (L. Agassiz.) . . .42 



Abactinal view of Aurelia flavidula. (L. Agassiz.) 42 



Cyanea arctica, very much reduced. (L. Agassiz.) 45 



Pelagia cyanella. (L. Agassiz.) 47 



Dacty'lometra quixquecirra, reduced about one fourth 48 



Profile view of Campanella pachy'DERMA 53 



Actinal view of Fig. 70 53 



A somewhat more magnified view of Fig. 71 53 



View of part of the actinal surface 53 



Magnified profile view of portion of the base of a tentacle 53 



View of basal portion of tentacle, seen from above 53 



Profile view of TrACIIYXEMA CAMTSCHATICUM 56 



One of the genital organs 56 



Section of Trachynema 56 



Chymiferous cavity at the end of the gelatinous proboscis 56 



View of Trachynema from above 56 



Adult female Traciiyxema DIGIT ALE, seen in profile 57 



Actinal view of the veil and circular tube of a very young Trachynema . . 5 7 



Profile view of a part of the circular tube • .57 



Profile view of a young Trachynema, about one eighth of an inch in height . 58 



Somewhat more advanced than Fig. 84 58 



Young Trachynema, measuring over one tliird of an inch in height ... 59 



? LiRiOPE SCUTIGERA. (L. Agassiz.) CO 



Halicly'STUS auricula, seen from the actinal pole CS 



Different attitudes of Haliclystus auricula, attached to eel-grass . . . .63 



Young Haliclystus auricula, magnified 63 



Tiaropsis ni.\DEM.\TA, natural size. (L. Agassiz.) 69 



Young Tiaropsis, having twenty-four tentacles ....... 69 



Young Tiaropsis, having forty tentacles. (L. Agassiz.) 69 



Two marginal tentacles of Oceania laxguida, with a portion of the circular tube 70 

 Majrnified view of the actinostome . . . • • • • • • .71 



