Coss—Nematodes, mostly Austrahan and Fyzan. 267 
Key to tHe Mates Descripep. 
IPhanynixwithitwoularcres beetlenn cmc teecssancsacit incites emesteiceeasiaideast naceteNefeecteieelelslecteteit 9. fluviatilis. 
Pharynx with only one large tooth. 
RS] OLA IEN Ai iel 4 Woh, Za eeganaccet ons Scoasecsoda0 adeosde acbneqoor oon cos, paandactinedeoaeonocdsepTosagondd 18. filiformis. 
Spicula not exceeding the anal body-diameter in length. 
TEIoP AINE JURE EN gcoaciqoten opppaccucooeconpEuenODnS won ecoDudKebacs sonmeySobHOT “seepsode 12. macrodon. 
Proxime cephalated by constriction, not furcate..................... Sggsasethecoebe 16. similis. 
Proxime neither cephalated nor furcate................2+006 Pr aconecenacet errno 8. graminum. 
Spicula exceeding the anal body-diameter in length. 
ALE HOTZ OREO) sab snoece sasnsbeccoou sons Snob uEnaoDSos cod ocodobas7ESDGoros4 Soe DonCOHDEMADS 10. trichuris. 
Tail 30 % or so. 
lela ymaerer ll Wwereidel LeASHll. coo coocosenoscon|No Aud due dob EAS coBaonSnsoDsOycASoacodouRCE 6. australis. 
Pharyngeal tooth not basal. 
Bodyslongitudinalliys striated enn asriaccaccceerccmeesecece rs ssrceerise rene = 11. striatus. 
Bodyanotsonstmated cece sep cee pari eeer etree eres tect areas rea 2. parvus. 
Tail about 15 % or 20 Y. 
Length not exceeding 1 mm. 
Proxim of the spicula geniculate.... .......... .....2-..-esseeeeceene oe 17. longicauda. 
Proxime of the spicula not geniculate. 
Throat or pharynx with a well developed tooth......... ........ 7. minima. 
Throat or pharynx with no well developed tooth................. 14. gracilis. 
[LGA GHENT, Sootecochoscacepeacegnaapnn eos osbadenocassHabnnonsbnonboacopogsendoas 13. rivalis. 
ee ° Abt, 142) -50=" 86- : 
1. D. viviparus, von Linstow. {7-37-3713 18m Cuticle finely transversely 
striated. In front of the anus three, and on the anterior third of the tail five, 
prominent rings encircle the body. On the ventral side of the hindermost of these 
rings occurs a circular organ with a circular centre, the whole beimg as wide as the 
tail at that point. Head truncate, but with a broad projection at the mouth ; sete 
none ; lips uncertain ; pharynx as deep as the head is wide and two-thirds as wide as 
the head, constricted in the middle, with some teeth of unequal size at the base ; 
pharyngeal swelling elongated, tapering behind; median bulb considerably behind the 
middle of the neck; posterior swelling much elongated, tapering anteriorly; tail 
conical, tapering from in front of the anus; caudal glands none; viviparous; embryos 
slender, without the chitinous structure on the head. 
Hab.—Water plants, Germany. It is perhaps questionable whether this is a 
Diplogaster. 
2. D. parvus, n.sp. Female unknown. eS ea mm. Neck conoid; head 
truncate, with six lips, each with one papilla; pharynx elongated, crooked, anterior 
part wider, the tooth appearing as a prominence and without a distinct and projecting 
apex ; cesophagus slender, the anterior part being only one-third as wide as the neck ; 
bulbs one-half as wide as the neck; intestine three-fourths as wide as the body ; 
