Ai-Ai.i-.ru. K. 



AI-.U 



with four rery strong and foliaceous arms. Four ovaries. Stomach 

 with occifunu appendage*. 



Example, Ptiayta LMdu, Each. (Cyanta Lobicke, Quoy and Oaiui.) 



Fflagia LMckt, 



Generic Character. Body circular, hemispherical, provided on its 

 circumference with lobes or festoons intermingled with auricles, largely 

 excavated below, with four mmilimar orifices, produced by four roots 

 of insertion of a considerable pedunculated mass, afterwards divided 

 into uight very complex brachideous npsndaasjs. fumiHhod with fibril- 

 lary suckers, without a median prolongation. Four ovaries, in the 



JUborfoM Onrim. 



khapo of a cross. Stomachal cavity very largo and vascular at its 

 circumference. 



Kxample, Ith'tintloma Curt rt, 



Jluhiinl. -Knropean Seas. 



M. d Blaiuville neparates Uie genus in' ; .>nn. 



Spociei having a pe.1 -.-rti..n for tht- n-t, with radical 



appeudagM, buuda* tnuta of the onus. 



r.. 



Speoios having a very abort pedumlr ,,( m-. rti..u. without radical 

 upiivndagea, bendiM the four bitiii arnw. 



We have given an illustration of the first The specie* grows to a 

 Tory large size. 



torn. 



Generic Ckarader. 1'. ,1, festooned, and 



provided with at loast t 



feranoe; excavated int. r - v \\iih >;,. 



appendages; CIMIH 



toe centre of u m.^li.r :ii .iihtinct bruchideous 



appendage*. Kmir n variea. 



Example, Vlirysaora I 



(1>r\i\aora hitra. 



a, onr-fourth of the dink or umbrella, seen from below j b, dik without IU 

 iippt tuiages. 



The Pultnograde Medusaj have been recently Rtndied with great 

 care by Professor E. Forbes, and In- |.r..| ,,*..* todirid* them int.. tw.i 

 grouj* according as their eyes or ocelli are covered or destitute ,.l this 

 |>rotecticin. When any of the more coniin..i! 



examined, an the x|>ecies of Rhitont^m'i ..r /',layi,i, it will ) found 

 umt the marginii of the oa-lli are protected by more or less compli- 

 cated membranes, hoods, or I liMni. t,-r u.. ..ii]- 

 panies another of great imnortaii. >. tli^t i^. Hie imsBessiou of a 

 eomplicatexl auastomosiH and ramili. ;,ti..n ,,| tin- raaWU In the case 

 of ThnumanKat and other gom-ra it will !.< found tlmt the ocelli are 

 anhtr ul>-nt or entirely nuke. I. uml tin- i-..n.|ition is acconi; 

 with u v.-ry simple vascular s\ . l'i..l. ii K.ul..- proposes 

 the following classification. 



I. Srt.. \\onitAi.vATA (<tTryj.v6i, rorcrerf). 

 Genera. Aurdia, Peron; Medina, Eschscholtz; /',/.-,", r.'n.n and 



