S|..M IEOSTOM1 -K i NDOSA, HI ri.l I.\I A i; I-. 



I ill'. I 



Undosa undulata Haeckel. 

 .1 unJulaia, HAM KM, iSSo. Syst. .Ii-i ' ;.|i>. t.if. ;;. hrri. 5, 6. 



Bell 120 nun. will i. 1 , 40 nun. high. Math rounded. A brown, in-raved, star-like titum mi 

 exumbrella composed of pigmented nertlini: rid<;cs. 4X io-<8) sharp-pointed. o\al lappets, 

 somewhat longer than wide anil projecting piomincntly: the \<i ocular lappets are somewhat 

 longer than the others. ( >t the 40 tentacles, the S adradial are i to $ times as Ion;; as hell- 

 radius, twice as long as the 10 secondary, and } limes as long as the 1(1 tertiary tent. u Us. 

 All tentacles are hollow. The 4 mouth-arms rest-milk- those of .lun-lti,i tiuntii, hut their 

 margins are more curtain-like and more tolded ,nul piouded with mum-ions trniacnlai 

 tilaments. The 4 "utters of the mouth-arms are vnv deep. The 4 toltk-d. intei radial, bag- 

 like gonads project from the floor of the snhumhrella. There are no siihgenital ostia. The 

 genital tadius is ahout halt ihat of the hell itself. Maigin of central stomach circular. 8 

 simple, unhranchcil, adradial canals and X fpcnadial and intertadiall canals, which gui- 

 rise to numerous side branches which in turn anastomose, loimmi: :l network of \essi-ls con- 

 nectmt; all tfi canals one with another and with the marginal ring-canal. 



The general color is bluish, and 

 tin siai-like marking on the exum- 

 hrella dark-brown. Found at l-d- 

 nando I'o. coast ot (Jumea. Vtiif.i. 

 I laeckel's " I 'hnnris f>rnt',t\'f>iii " 

 horn St. Helena is probably the 

 young of ibis species (/of. .it., iSSo. 

 p. 545. taf. 33. fign. I 4). 



Genus DIPLTJLMARIS MAAS, iqo8. 



Diplulmarisj MAAS. 190*, n \ntarctiquc 



Fran 'i. 



I 'Imaropsit, VAMIHH IN, \>>c*. I ' 'p.J.n 



Bzpedirion, Bd. 10, /.u<il. 2, p. 4^. 



The type species is />: ftliilniuris 

 untiir, tii ii, Maas. ii;oS, from the 

 \ntaiciic < >cean. 



'.! M-RIC CHARACTKRS. 



- 



. 



; 



. afu-r H.i' > ) i ' der Medusen 



Ulmaridae with i(> tentacles. 1*4 

 marginal lappets, and in marginal 

 sense-ot'^ans. i'> luanched radial- 

 canals m the radii ot the sense-organs 

 and 10 simple straight radial-canals 

 of the canals are joined by an anastomosing network ot \essels 



I h ,. ;X () . I ;'.,',; iiiijiiliu 



in the tentacular radii, 

 near the bell-margin. 



This medusa bears the same relation to ( nJ'i\,i that SanJeria does to Dactylometra. 

 Indeed, there is a remarkable case ot parallelism of mutation in the I'elagnl.r and rimarul.i- 

 as is shown in the accompanying table. 



is a connecting link between the subfamilies I'nilnnn.lu, in w Inch the ten- 

 tacles arise from clefts between the lappets, and SthenoniJit, in which they anse Itom tlu- 

 subumbrella floor; for in the young Diplulmarii the tentacles arise from the subumbrella, 



