399 



die niedersten Heteromastigoda^ Dank dem Dasein des Cercohodo^ auf 

 das innigste mit den niedersten Monomastigoda verbunden, und wenn 

 wir noch dazu in Betracht ziehen, daß schon Bütschli unsere Auf- 

 merksamkeit auf die nahe Verwandtschaft zwischen den Euglenoidinen 

 und den Anisoneminen, also zwischen den höchst entwickelten Mono- 

 und Heteromastigoden, lenkte, so leuchtet von selbst ein, daß die drei 

 Unterordnungen der Flagellata, nämlich die der Monadma, der Eugle- 

 noidina und der Heteromastigoda , als eine zusammenhängende aus 

 naheverwandten Gliedern bestehende natürliche Gruppe, den Iso- 

 mastigoden gegenüberstehen. 



Odessa, den ' . — 7^ 1886. 

 6. April 



2. The life-history of an Acarus one stage whereof is known as Labido- 

 phorus taipae (Kramer) and upon an unrecorded species of Disparipes. 



By A. D. Michael, F.L.S. F.R.M.S. 

 (Vorläufige Mittheilung.) 



eingeg. 21. April 1886. 

 In 1877 Kramer described a creature which he found parasitic on 

 the mole and treated as a new species, naming it as above ; it resem- 

 bled Koch's Dermaleichus sciurinus; it was however suspected that 

 both were immature, hypopial forms. In 1879 Haller discovered 

 the adult form of Z>. sciurinus, he found it upon the squirrel in con- 

 siderable numbers and in all stages, Koch's supposed species being 

 the Hypopial Nymph. For some years I have been trying to trace the 

 life-history of Kramer's Lahidophorus which I frequently found on 

 the mole but which I could not get to thrive away from its host. Less 

 fortunate than Haller I could not find on the mole any Acarus 

 which could be the adult stage. Last December it struck me that I 

 might succeed by getting the moles nests; here I found adult males 

 and females of what I thought might be the species, I also found 

 immature Acari in the ordinary nymphal stage which I suspected be- 

 longed to the same species ; by keeping these in confinement, and care- 

 fully watching them, I was enabled actually to see the hypopial nymph, 

 Lajndophorus taipae, emerge from the cast skin of the young ordinary 

 nymph, and the adult males and females emerge from the cast skin 

 of the fully-grown ordinary nymph. I propose to call the species 

 Glyciphagus Cr ameri. It is a singular species, the males having re- 

 markable comb-like longitudinal ridges under the front legs. In my 

 extended paper I also describe the life - history of a new Disparipes to 

 be called Z>. exhamulatus. 



