Di Macieay Memoria VoLuMe. 
Spicula longer than the anal body-diameter..............-sseseeeeeneeseeeeeeeeeeeeeeseeeeeseereeene 12. tenwicauda. 
Spicula about equalling the anal body-diameter in length. 
Sete none. 
AMberior EXtremiby LOUMA EM cejeses\eleieteleelssersc sels cierle/ot locl)a(loleises)lelislsseleelle(selte tr 2. papillata. 
Anterior extremity truncate. 
Accessory pieces one-fourth as long as spicula.............s:seesee eee see een eee ees 4, glomerans. 
Accessory pieces rudimentary.........c.ssseeceeecececerensecaceersererereesesseeaes 3. affinis. 
STG Cia a AREO A Sac epREE ESE ae eaetog Olli con decce nr ar ccgnccetasadnnaqca socsoo cas ssonGdecoecdad acapandsne 10. filicaudata. 
Or, 
Setze 6-10. 
IFMiey Loa eat sty TET Geert rete ett aetstee ete eee lets elate ete eteetavelekeleUdstateteetettatetettatelestaletet= els)sise\stets(ectetieleleitefeeiate= 6. marina. 
Habitat not marine. 
Spicula as long as the anal body-diameter, tail 22 7/.........6 ceeeeseeeeecee eee eeeees 10. filicaudata. 
Spicula longer than the anal body-diameter, tail 9%... ......ceeeeseeseeeee een tere ee 12. tenwicauda. 
Spicula shorter than the anal body-diameter, tail 16 7/........-...ee0eeee ceeeeee es ll. setifera. 
Setze none. 
Accessory pieces one-fourth as long as the spicula .........-+.ssseeeeeeeneeneee cee eee see ees 4. glomerans. 
Accessory pieces rudimentary. 
Bength)3-2)mm:, head rather rounded)... .ceerceen-eracierisncierseen et reeieetiamncse er 2. papillata. 
Length 1:4 mm., head truncate.........:..cceseerseseecesescrcenerteecseesaenecncnencenn es 3, affinis. 
. 0 ao ie oye : s 
1. T. salsa, Bastian. [37-35-3523 217mm. The cuticle is marked by about three 
hundred and fifty transverse striz. The head is rounded im front and bears two 
lateral papilla. The cesophagus is cylindrical ; the intestine is three-fifths as wide as 
the body; rectum half as long as the anal body-diameter. The junction of the 
cesophagus with the intestine is such as to give rise to the appearance of a “collar” 
or pseudo-bulb. The lateral fields are one-fifth as wide as the body. Terminus one- 
sixth as wide as the base of the tail. Male unknown. 
Hab.—Found on roots of Ruppia maritima, in brackish water, England. 

2. T. papillata, Biitschli. {S25 ae 32mm. Cuticula striated; head rounded 
in front, bearing three rows of papille, of which one represents the row of cephalic 
setie ; cesophagus conoid, anteriorly less but posteriorly more, than one-half as wide as 
the corresponding part of the neck ; cardiac constriction exceedingly deep ; tessellated 
intestine at first only one-fourth as wide as the body; rectum half as long as the anal 
body-diameter ; juncture of the cesophagus with the intestine such that a very oblate 
pseudo-bulb is formed ; terminus one-sixth as wide as the base of the tail; eggs as 
long as the body is wide; ovaries reaching about half-way back to the vulva. 
Was s2mm. Spicula equalling in length the anal body-diameter, with a central 
stiffening piece ; accessory pieces rudimentary. 
