Waite — Review of Australian Tvphlopidae 



11 



Chart 5. Distribution of • T. piiigiiis, O T. arypiis, X T. endoterus. 



The rostral shiehl extends from or nearly from the level of the eyes to ahove, to the 

 mouth helow, of which it forms the anterior border; it varies greatly in shape, 

 as will be seen by consulting the illustrations, and as regards size may be but a 

 narrow band, as in T. lii/atiis. or fully half the width of the head as in T. anstralis. 

 The nasals (and following shields) do not reach the mouth; it is their extreme 

 tumidity in T. bitiiberculatus that produces the condition already referred to in 

 this species. The nostril, situated in the nasal, is unmistakably inferior in the 

 species named ; in most others it occupies a sublateral position ; in one only, 

 namely, T. labialis, is it truly lateral, appearing on both upper and lower aspects. 

 The nostril may lie close to the rostral, as in T. ajfinis, or be removed considerably 

 therefrom as in T. polyi/raiinnicits. In T. cndotcyiis the cleft is arrested at the 

 nostril; in se\eral species, as in 7\ brooiiii. it di\ides the nasal; whilst in T. 

 torrcsiaiuis. instancing an extreme case, it is projected far on to the upper surface 

 of the head. The preocular is present in all Australian species, and in contact 

 with the second and third labials; in all excepting T. labialis it is narrower than 



