^"h!K!^''] jMi()(M:i':i)iN(J.s OF Tiri': national miisiiiim. 185 



tulM'.r(;l«ss bccoiiic- imu-li lliilicr, iiiid lowiird ilic l»iis(i lli<'>' iiic, rcprc- 

 H(Ujt(Ml l)y slij;lit l,riiiisv<'rs<'ly ('J<)ii<;ii<,<'<l, ikiiiow <il<'v:iiioiis, ilio loiij;i- 

 tiulinal :iniiiij;<MiUMit, ln'iiij;' nearly lost, 'riio liiiiltiis is siiiootli, (he 

 clival ions liidinj;' oul. ii sliorl, distancr altovt^ i(.. 



'riic basr is innrli sniallci- llian 1 he, coliinin anil i>; deeply e<»nea\'e, a< 

 (|nantity of nind, wliieli <'vi<leiitly soived (o aneluH IIk^ animal, Itein^ 

 inel(>se<l in llie eoncaA'ily. 



^riie np|)ei- part of \hi'. ecdnnin or ea|)itnlnin does nol posse.ss any 

 tnbeieles, lliese )>ein^- liniiled to tin' seapns. Tin' nppei most tnber 

 eles ai'e usnaJly more prononneed than those lower down, and Ibrm a. 

 more, or less distinct coronal series (IM. xx\', V\<^. S!> cor), consisfiii};' of 

 tvventy-Conr (id)ereles. I^'iom eacdi eoi'onal tub<M(d(^ a ridj^e (c /•.), ex- 

 tends aei'oss tlie <a|»itii]nm lowar<l the bases of tlio, tenla<-les, and be 

 tw<',en each ])air oC these coronal ii<lj;es a smaller rid<;e int<'.rv<'nes, ho 

 that the eapilidnm bears in all forty ('ij;ht lidj^es. ^IMiey are, dec,ide<lly 

 ])rominent, with thin walls, the cavities which they conlain connnnid 

 catin;; with the endoccels. I Jcfore reaching the level <d" tlui bases ol" 

 the outermost tentacles each iid<;(i somewhat suddenly iner(ias<!S in 

 heif^ht, an<l mor<' sndcb'niy dinnnishes, j^ivinj^' ris<' to a pouch like 

 Htructur<^ The ridf;es tiirminate at the bases oC the tentacles of the 

 tour inner cycles, the t,ent,a(des of the outcsr (tych^ beinj;' situai,<'d ii|)on 

 tin; sidesof the iidermtMliaie smaller rid^^'es, in the manner in(licat(;<l in 

 the K(;liemc j?iven on PI. xxxv, ^'i;,^ ]ti\. 



Wheu the cntich', is pr(^served t h(^ <'oliinin has a, dark biown color, 

 but the tubercles are white- for the most, jtart, owin"-' to the cuticle liav 

 inj4 been rubbed off. The eapitulnm in the alcoholic specimens is 

 Cidoi'less; the disc and tentacles, however, nvo. oranj^e or salmon 

 colored, while the stomatoda-um is brown. 



The ine.so^l(ea of the column wall is thick and delicately iibrous in 

 structure, with it few cells scatt^ered through it. 'I'he ectoderm, where 

 l)reseut^, is covered l>y 1-he thick cuticle, t,o which particles of (brcif^ii 

 matter adhere. '^Phe tubercles ar<', solid elevations of the nu5Ko^lo;a. 

 The splnncter muscle (IM. xxx, l^'ij^. H(») is faiily strong, but \aji(;s some- 

 what,, both in its thickness jind width, in dilfercMit specimens, the dif- 

 ferences not beiufijdue to af(e, as in some cases I have found the muscle 

 much wea,k<'r in a larj^e specimen than in smaller r)nes. It occupies the 

 entire capitular ief;ion, and extends a, varyinj; distance Im'Iow tli<*, <!or- 

 onal tubercles. Throuj;hout its entire width it is widely separates from 

 the emlodermal surface of the column and lies in the sca|>us very (dose 

 to the ectoderm. In transverse section (IM. xxx, Fijf. 88) it is seen to 

 consist of more oi- less (;ircular cavities, t laversed by irrej^nlar par- 

 titions of mesoj;l(ea, thonj^h in some; cases the- caviti(;s are. mor(t numer- 

 ous and smaller, and almost d(^stitute of i)artitionH. Toward the lower 

 ed^'eof tlu^ muscle the cavities aie, in one or two series, ])ut they be- 

 come nunc nnmeious abo\e, but there is no well mark<'d, sudden thick- 

 ening' of the muscle in its iip|>er [lart. A curious a,iraii<;emcnt is found 



