nn -I:I:TI i.AKin.K. 



11 



The blind sack K very well shown in .{!>!, tumi-in ,il>;,t'm<i (ti^s. !.">- If,), where it U perfectly 

 evident that it is a hernia-like protuberance from tin- l,ody \\all of tin- hydranth which i- attached 

 to the hydrothecal wall liy a hand of ectodermal ti-Mie. That the -truciure- ju~t de-crilied are 

 very widely distributed sinioii^ the Sertnlarid;e is proved hy the fact that I have found them in 

 one or more typical >peeie> of the Following genera: /'// <//'.///,/. .sv /////<///,/, >'///,///.</-//. JI,j,/rnll- 



bs 



13 



11 



r- : M.TI 



Fig. 1:!. r i 



Fis, 1 . II . -:m ,.i|,,l . ...... i. .11. .11 !..!.. 11 Hi,- liyilninil, nnil tin- s 



Fig. 1">. !'!< 



Fig. i,;. .!/./ ' . '- 1, i. Mini sack. 



n: ;.. |>niinii'iiir. 



S,liii/iiii>j>x!x, !>!jili,ix!,i. . I lii, tliiiiriii. />!i-fi/<ii-ltiil!iiiii. and .V //,//,/,- II, i. In >'</////<///</ 

 there are ajipari'iitly two protractors on oppo-ile ^ide- of the hydranth. i^ec iic_r. ;t. 

 p. !.) The.-,e may lie the structures referred to l>y Louis .\LTa"i/ :i- " lilm-like project ions or 

 pseudopoilial [irolonyations" t>v which the ectoderm of the liody wall i-> connected \\ith tlie 

 wall of the livdrotheca. A still more ^trikiiiL r ca~e in \\hich two pi-otraetor- are pn'-enl i- found 

 ill l>ij>lnix!,i ilnjl/tilix. (Sec liu'. 17.) 



