^'Tkuj"] PUOCEEDINOR OV TIIK NATIONAL MUSEUM. 203 



wei'<' nuicli iiiiiiowor nnd w<'re Jilso destiliitc <»l' r('i>r<)<ljictivo orf^aiis, 

 Wliclhrr, as I am iiicliiM'd to hcliovc^ is tlic, <'a.so, ai tliird j^iadc, is prcs- 

 oiit, extending- only a slioifc distance below the Ktomatoda'uni, is uncer- 

 tain. 1 was not able to j)roi)ai'e a satisfactory series oC sections wbicli 

 would denxMistratc this point, but sections made throni;h a small por- 

 tion of the column wall at a level with the .stoinatoda'uin seem to show 

 a. greater nundn'r of mesenteries than occur in a ]»ortioii of the same 

 si/e lower dow n. 



TIm' charactiM' of the mesenteries attached to the sulcar <lirectiv<' I 

 did not discover. Opposite thc^ snlcular cud of the stomatoda'um I 

 found a, single mesentery (1*1. xxxiv, l<'ig". 1 IS, nics) which rai)idly dimin 

 ished in si/e as it jiasscd backward, and c\'cn at th(^ level of the lower 

 edge of the stomatodanim was reduced to the merest rudinuMit. Tiiisi 

 take to be a newly formed mesentery, its fellow of the o])])osite side 

 not ha\ing- a|>pcai'c(l. 



A decided altncuniality was seen in sections taken about the middh' 

 of the column ( I M. WW, I'Mg. lH(>)i which in\ olvcd t wo mcsentcri<'s sitn 

 atcd at or near the sulcar sinlacc(*). 'I'iicsc had united tolbrmal>and 

 from whicii t,wo lanu'lla' extended into the bod,\' cavit-.w A little higher 

 these lamella' wei-e likewise united so thai a ca\ity was inclosed by the 

 united nu'senteries. 



1 was not able to distinguish any aeontia in the r<'gion wher«^ they 

 usually occur in ('eriaidhids, though mesenterial lilaments oceurre<l on 

 all the mi'senterics. They were very im]>erfe<*tly preserved, howcxer, 

 and did not allow of an aru-urate, study. 



The I'eprodnctivc organs arc borne by the wid«'st mesenteries, which 

 extend the- greatest distances <lown the colnmn. l>oth ova and sperma- 

 tozoa seem to be borne by each nu'sentery. (Plate xx w, Fig. 110, or and 

 te.) Ova aie certainl_\ present and occurring with them, inclosed in the 

 nu'soghea, bodies which J take to be spermatozoa. They {tr) vary much 

 in size, oceasioimlly being many times hiiger than the ova, and (consist, 

 of a deeply staining wall crow<lcd with small nuelei, a, caxity occurring 

 in the center of the larger om's and containing numcious nuclei, at- 

 tached to wliieh 1 eonid in sonu' cases discover delicate ai)i)endag'es. 

 They do not r«'semblc the si>ermatozoa bundles of tln^ llexaetinia', but 

 bear a. close rescnd»Iancc to the testes of (\ ')n('))ihr<(n(«'<iis, ll'^uvvd by 

 the llcrtwigs. iUrliuitlnis van is accor<lingly most jn'obably one of the 

 hermaphrodite ( /crianthids. 



The endoderm coN'cring the mesentei ies i>r<'s<'nls the same characters 

 as that found in the same regicms in (\ amcriatnus^ \\'\\\v\\ 1 have de- 

 scribed elscwln'r*' ('!•(>). 



UNlDEN'ni'IKI) 1\)KMS. 



No. 72r>. Station L'.S'ir.. Eat. LM^' 22' 1.^. " N. ; loii.t;. 110 ' W l.V W. l)r|»Mi, 7 (mMkihi.s. 



Ono Hitt'c.inieii. 

 No. «r..'">. Sf.it ion 27(15. Eat. :^()M:r S; lou.;. .'")(;' 2:!' W. l).-i)tli. 1 H laMionis. One 



.sju'cinicn. 



