ISO AC'l'INI.K (U-' Al.i; AIMJOSS KMM.i )1{,\TI< >NS M<'MURHI('1I. 



TIk' triiliicU's ;'r(* oxpost-d (o ;i urtMlci cm- less cxtnit in nil the spori- 

 iiuMis; llu'.v arc short, :iiul poiiitvd at thr :i|u'x. They are stron.uly 

 entaeiiiieoiis and their iminlter is probably less than oiio huiulu'd. 

 Their lonjiitiidinal innseulatiii'e is eetodermal and is fairly developed. 



The ines«Mderi<'s, as in tlu' preeedinji' species, are arranji«'d npon a 

 deeanierons plan. There arc ten pairs of peilect mesenteries consti 

 tutinji- the tirst and second cyiles; the third cycle is imperfect, bnt 

 well d(>veloi>ed, while the fonrth cycle is considerably smaller. Here 

 and there pairs of mesenteries of the tilth cych' can be seen, bnt this 

 cycle is iu»t complete. ]Soreproducti^t^orJ^•ans were i)resent. The lonn'i- 

 tndinal mnscnlatnre is fairly well developed on the lari^ei' mesenteries, 

 the iiiesoiiheal i)ro»'esaes increasinj;' jiradnally in si/.c towards the 

 inner maruin of the muscle and there abrnptly diminisliin.i;. 



24 Sagartia paiadoxa, sp. uo\ . 



rialo \\i\. Fins. 7;»-Sl; riiilc wx, Fi;r. SI 



No. (i5)2. Station. l.'7(U!. I,at., :>(i 17 S. ; long., r)G 'JM W . 1 •<i>tli, 10', tallioni.s. 

 Spv«Mal spotimtMis. 



In this tbrm (IM. \\i\, b'ii;. 7J>) the base is adherent. The column is 

 loniiitndinally rid.u('<l with line elevations, and does not bear any tuber 

 cles or verruca', noi- MtMc any cinclides obscr\able, acindia bein.ii 

 emitted trom the month, however, in several sjx'cimcns. Nearly all the 

 spccinuMis have the tt'iitaclcs and <lisc perfectly unretracted, ami the 

 stomaloda-nm is nu»re or less evaj^inated in many. The spccinuMis 

 have an averajic heio-ht of about O.S'"'-, and a diameter of about ().".)•"'• 

 Thesi>hincter muscle (PI. xxix, l-'ii;-. SO) is very well developed, notwith- 

 standing the nonrelraction of the tentacles. It occupies the entire 

 thickness of llu' nuvso^hea, and is thickest about the middle, tai)erino- 

 ot! above and below. The nnisch' cavities are very numer«)us, and are 

 separated only by very thin trabecula' of nu'so^hea, so that the column 

 wall in the rciiion of the sphincter has an openly reticulate appearam-e 

 in lonjiitudinal section. 



The tcntai'les occui>y tlu> mar.uin and aic very niunerons, short and 

 acuminate, ami decidedly entacnneons. Their longitudinal nniscnia- 

 tun> ami the radial mnscidatnrt' of tlu> disk is ectodcrnml, the nuiscle 

 ])roeessesbeiuji: fairly well developed. The disc is smooth. The stonui 

 todaMim is lon,i;itinlinally ridded, and has two siphono,ulyi>hes, one of 

 w hich, however, seems to be nunli de(>i)cr and more distinct than the 

 (tther. 



TIh> mescniciies ])r«'sent a rather peculiar airan.i;ement in the two 

 specinuMis of which an anatomical study was madc(ri. X\x, Fiu'. S4). 

 Thc\ arc arran<.;ed on an octanu'rons plan. If w(> consider for cmnen- 

 icuce in tlcsciiption eiiiht pairs as constitnliui; the tirst cycle, then the 

 tirst three cycles (i, ii, m) an' all perfect, the mesenteries of the third 

 cycle losin«4' tlu'ir connection howevi'r with the sfomatoda'nm about 



