J{ew South Wales. 175 



■39 ram Tail conical ; bursa nearly symHietrical with 

 respect to the aims, ending postcrioi'Iy near tlic middle of the tail ; spicula 

 one-fourth as long as the tail. 



"Water, Ratzeburg, Germany. 



20. T. Davainii, Bastian. l;5-Jtl<iL_Hl_«r!!* ,. „„. About six hundred 

 trausvcrse striie, hardly heterocephalous, the head being concave-truncate 

 in front ; almost liplcss, papillic none ; spear 3-bulbed at the base ; ellip- 

 soidal median bulb one-half to two-thirds as wide as the neck ; posterior end 

 of the oesophagus widened in front of the distinct cardiac collum; intestine 

 one-half as wide as the body, the contents of its cells granular ; rectum as 

 long as the anal diameter; po/'ws cxcrctorins at twelve per cent.; lateral fields 

 rather broad ; nerve-ring oblique ; tail conoid from the inconspicuous anus 

 and possessing caudal glands ; terminus conical, narrow ; vulva inconspicuous ; 

 rudimentary posterior branch of the sexual apparatus one-half as long as the 

 adjacent ])ortion of the body is wide ; eggs twice as long as the body is wide, 

 iind less than one-third as wide tis lonff. 



;:? ; 'm ~"„ ^li— 1- mm. Tail like that of the female ; bursa sym- 



metrically arranged with respect to the anus, appearing when seen in profile 

 to be twice as long as the spicula ; spicula somewhat irregularly arcuate- 

 cuneiform, as long as the anal diameter, and accompanied by slender 

 accessory pieces half as long. 



England, Germany, Holland, and Australia. Very common, being the 

 typical species of the genus. I have observed the position of the nerve-ring 

 in a single Australian specimen, and therefore permit its position to stand 

 as questionable for the present. 



21. T. intermedius, DeMan. ° ! '"" "^ V »»" Cuticula very 



finely striated; neck diminishing considerably to the somewhat heteroce- 

 phalous anterior extremity, which has a hemispherical form and is destitute 

 of appendages ; cesophagns distinct, widening to form a very small ellip- 

 soidal median, and a pocket-shaped posterior bulb ; 2'<»'>'s e.vcrc/on'iis at 

 eleven per cent. 



i — ♦ — i — 2T — f — "''"""■ J-ail conical; bursa springing from a little in 

 front of the anus ; ribs and papilhe none ; spicula rather plump, accom- 

 panied by weak, linear, arcuate accessory pieces one-third as long. 



An active species, found in fresh and brackish soil, Holland. 



22. T. elegans, DeMan. -K'- ] "' ";, -f imm. striae of the cuticula 

 exceedingly line; neck diminishing considerably to the barely heteroce- 

 phalous hemispherical anterior extremity ; lips and papillsc none ; oesopha- 

 gus with a rather small median bulb and a posterior widening; ^orvs cxcre- 

 toriiis variable ; tail conical. 



T ! f — 2^0 — T" '■ """• Tail conical ; bursa small, symmetrically arranged 

 •with respect to the anus; spicula slightly arcuate, with slightly arcuate 

 accessory pieces one-third as long. (Syn. T. exiguvs, De Man.) 



Moist soil, Holland. Becomes sexually perfect when small. 



