70 



THE SCYPHOMEDUSAE 



adradial canals grow into them. The mesenteries lose their attach- 

 ment to the body wall and are probably converted into phacellae. 



Fio. 9 



End 



cc 



Fi(i. 10. 



0. — Surface view of tlio siibunilinil or oral aspect of Aiinlin auritn, lo show the 

 ]iOKitiuii of the openings of the siibjieiiitjil jiits, <!]'. In the centre is the month, with four 

 perradial arms corresponding to its «nj;les, or. The four sub);enital i)its ant seen to !«• intvr- 

 ratlial. r, indicates t\w outline of the roof (ahonil limit) of u suli};enital i)it ; i/. t'"' outline of 

 its fliwr or onil limit, in which is the opening ; Tr, tentjiculocyst. (After Ijinkester.) 



10. — 'I'entacnlocyst of Aurelia nurila from the onil as])ect. ft', circular canal; //, tini 

 abonil ho<«l ; /,, tlie protective lateral lappets; '/', tent;icles ; 7", tentaculiK'yst, carryinj; an 

 ocellus, and a terminal mass of otoliths; ']'C, endodermal canal of the tentnculoi-yst ; J', the 

 "velarium," or thin edjje of the bell. The outline of the endodermal canals is dotted. 



11. — TentacuhM-yst of Aurilia auritn (lon^titudinal section). A, superior or nboml 

 olfactory pit; /(, inferior or adonil olfactory jiit ; //, bridge between the two mar^-inal la|ipets ; 

 7', tentaculiicyst ; Knil, endoderm ; F.iil, endodermal canal continued into the tentaculocyst ; 

 Con, end(Hlermal concretion (auditory); r)c, ectoilermal pi^nient (ocellus). The dr.iwinj; n-pre- 

 st-nts a section, tiikt-n in a radial vertical jilane so as to iwss throui^h the loiij; axis of the ten- 

 taculocyst. (After Kimer.) 



Concrescence of the e.xuinlir.il ;iih1 sultumbral endoderm of the 

 coelenteron into a gastral lamella nltimately gives rise to the com- 

 plicated system of gastric j)0uches and canals of the adnlt. 



