126 



Dr. Strethill Wright's Observations on 



Eudendrium 

 arbusculum 

 (male). 



E. confertum 

 (female*). 



1 Laomedea 

 > Loveni 

 J (male). 



Placenta adherent to summit of genera-" 

 tive sac ; summit of sac furnished with 

 cluster of large thread-cells ; sac the 

 equivalent of the peduncle of Coryne 

 gravata 



Summit of sperm- sac furnished with a row 



of tentacles indicating the presence of a 



non-differentiated subumbrella 



Generative sac transformed into a free 



walking medusoid ; peduncle furnished 



with branched tentacles, as in Bougain- 



villea ; subumbrella not differentiated, 



its presence indicated by eye-specks 



and otoliths; umbrella absent 



Ovisac fixed, enclosed in a differentiated I Laomedea 

 subumbrella with lateral and circular > Loveni (fe- 

 canals and tentacles J male). 



Sperm-sac surmounted with large thread- ) 

 cells, and forming the peduncle of a fixed ( Coryne gra- 

 medusoid with differentiated subum- f vata. 

 brella and umbrella j 



Eleutheria, 

 medusoid of 

 Clavatella 



(Hincks). 



Imperfect free Medusa ; peduncle with 



( Medusa of 



tubular mouth, and united with a single- \ . y 

 cavitied generative sac j Sarsia. 



Perfect free Medusa of low type ; pedun- 

 cle four-tentacled or lipped, and con- 

 taining eight generative sacs coalescing 

 into four, which are situated alternately 

 with the tentacles or lips 



" Bougainvillea 

 Britannica, 

 the Medusa 

 of Atractylis 

 ramosa (fe- 

 male). 



Turris neglec- 

 ta, the Medu- 

 sa of Clavula 

 Gossii (fe- 

 t_ male). 

 Perfect free Medusa of low type ; pedun- ) 



cle four-lipped or tentacled, with eight ( Oceania epi- 

 distinct generative sacs, one placed on T scopalis. 

 the side of each lip j 



* In the ovisac of E. confertum (see figure in margin), 

 which I have had an opportunity of examining through 

 the kindness of Mr. Alder, the endoderm and ectoderm 

 at first adhere together at the summit of the sac, and 

 at this point a few large thread-cells occur in the ecto- 

 derm. A similar occurrence of adhesion and thread- 

 cells is found in the sperm-sac of E. arbusculum, and 

 also in the false and mouthless peduncle of the medu- 

 soid of Coryne gravata. 



'] Generative 

 I sac become 

 S a peduncle 

 (* manubri- 

 um,' AUman). 



Subumbrella 

 present, but 

 not differ- 

 entiated. 



j 



} Subumbrella 

 differen- 

 tiated. 



( Umbrella dif- 

 r ferentiated. 



r Peduncle or 

 alimentary 

 polyp and ge- 

 nerative sac 

 not differen- 

 tiated from 

 each other 

 {see post). 



Generative 

 sacs differen- 

 tiated from 

 alimentary 

 polyp, but si- 

 tuated on it. 



