176 AjricuXtwral Gazette. 



23. T. Askanaseyi, Biitschli. 'X \ "^^^Z^ T' '""- Cuticula 



smooth (?) ; the fusiform body continued in front by a convex-conoid neck ; 

 L'p rogion distinct; spear vvitha tiiree-bulbed base; oesophagus one-eighth to 

 one-fiftli as wide as the neck, expanding to form a median bulb twice as wide; 

 posterior bulb one-fourth as long as the oesophagus and half as wide as the 

 adjacent part of the neck, and containing a cell ; cardiac coUum not very 

 distinct ; cells of the yellowish-brown intestine filled with granules ; rectum 

 twice as long as the anal diameter ; wings present ; tail conoid, its terminus 

 pointed ; vulva prominent ; rudimentary posterior branch of the sexual 

 apparatus extending more than half-way to the anus ; the unsegmented eggs 

 as long as the body is wide and half as wide as long. 



K — \ — T8~~r — ^ '■'"""• Tail conoid from the inconspicuous anus; bursa 

 apringing from opposite the proximse and extending to the middle of the 

 tail; si)icula cuneiform, slightly arcuate, one and one-half times as long as 

 the anal diameter and accompanied by linear accessory pieces one-third 

 as long. 



Males and females equally abundant among the leaves of moss; Germany. 



One to two dozen adult worms are found among the leaves of a moss-bud, 

 accompanied by countless young. The latter develop in the moss-bud until 

 as large as the parent worms (1' x '028 mm), the sexual organs, however, 

 remaining very rudimentary. 8exual maturity seems to be reached only 

 after a residence in the soil, and when the young worms have made their v( ay 

 into the buds of young moss-plants, and is then, as in T. fmiyornin, probably ' 

 attained at a single moult. 



21. T. mirabilis, Biitschli. \^\ V "f °L '•»■"• Cuticula striated; 

 neck convex-conoid ; heteroeephalous, the head being about hemispherical; 

 lips and papilhc indistinct ; spear slender, bulbed, hollow ; oesophagus in its 

 anterior part one-third as wide as the neck, a little behind the middle 

 becoming rather suddenly twice as wide ; cardiac collum not deep but 

 distinct ; rectum one-third as long as the anal diameter ; tail convex- 

 conoid to the rounded terminus ; vagina two-thirds as long as the body is 

 wide, thick-walled ; ovary reflexed to near the vulva ; male unknown. 



Only one specimen has been seen. Eoots of moss, forest, Frankfort-on- 

 the-Main, Germany. 



Note. — It is in order to place in the annals of Australian literature a connoctod a'ceount 

 <}f Ihe important genus Tt/lenchus that I have inpcrled the foregoing summary, in which I 

 include Ihe species hitherto referred to tlte genua Heterodera, inasmuch as I bclievo them 

 to be in renlity species differing in no very es.sential manner from those constituting the 

 group Tylcnchu.i. I venture to hope that with the aid thus afforded any one familiar with 

 tlio \ise of the microscope will be able to recognize the different species of Ti/lencMis. 

 Where there are so many capable microscopists it is reasonable to ho].e that some will now 

 and then turn their attention to the exceedingly interesting and important group of 

 animals of which Tt/lenc/ius is a member. It will be necessary to spend a few moments in 

 mastering iho formula used. For this purpose the reader is referred to page 131 of the 

 first number of this Gazette. For the convenience of those most familiar with the English 

 unit of microscopic measurement it is deemed best to insert hero the following 



Sule. — To convert millimetres into inches, or thousandths of a Mjillimetro (/t) into 

 thoueandlhs of an inch, multiply by '03937. 



