ON THE ANGUILLULID^. 173 



" Os cirrhis quatuor instructum. Ocelli duo discreti. Longit . . . ." 

 " Hab. In aqua stagnante prope Berolinum (Nordmann)." 



2. P. MiCANS, Nordmann. 



Phanoglene micans, Nordmann, in Lamarck's Anim. sans Vert. 2"^ ^dit. iii. 664. — Dujardin, Hist. Nat. 

 des Helminthes, p. 238. 



"0* cirrhis duobus instructum. Ocelli coaliti. Longit . . . ." 



" Sab. In larva Neuropteri {Nordmann)" ^. 



In all probability, this was a mere accidental tenant of the intestine of the Neuro- 

 pterous larva in which it was found by Nordmann — having been swallowed with its food. 

 The presence of ocelli renders it almost certain that it could not be an habitual parasite ; 

 and the experiments of Davaine (Recherches sur I'Anguillule du Ble nielli, p. 64) have 

 demonstrated that these Nematodes pass uninjured through the intestinal canal of many 

 of the invertebrate and cold-blooded vertebrate animals. 



The only freshwater genus in which I have yet met with species possessing ocelli has 

 been Ilonhystera. 



The three following marine species I am very uncertain about, and have therefore 

 merely followed Eberth in allowing them to remain in this genus. 



3. P. ROSEA, Eberth. . 



Lineola rosea, Kolliker, Verhandl. d. Naturforsch. Gesell. in Ziiricb, 1845. — Eberth, Untersuch. iiber 

 Nematod. p. 18. 



" Rosenrothe Farbe, Kopf dreilappig, stumpf, Muudhohle unbewaffnet, Fiihler gleich 

 lang, an der basis der Ko^iflappen ; seitlich an der Speiserohre zwei braune viereckige 

 'ElQckenr— Eberth. 



4. P. OBTUSiCATJDATA, Eberth. 



Lineola obtusicaudata, Kolliker, Verhandl. d. Naturf. Gesell. in Zurich, 1845. — Eberth, Untersuch. iiber 

 Nematod. p. 18. 



" Kopf noch stumpfer, und die braune Flecken noch einmal so gross, von 0-066'", 

 Fiihler sehr kurz, 0*001-0'0013"' lang, vier fast ganz vorn, zwei etwas weiter hinten, alle 

 mit dicker in der haut steckender Basis, Schwanz stumpf, kurz, 0"0033" lang. Penis 

 sehr kurz, von 0"015'". — Bbertli. 



5. P. Elustr^, Eberth. 



Eberth, Untersuch. iiber Nematod. p. 18. 

 Ascaris FlustrcB, Dalyell, 'The Powers of the Creator displayed in the Creation,' vol. ii. 1853, p. 92, pi. x. 

 fig. 27.— Leuckart, Archiv fur Naturges. 1859, Jahrg. 25, Bd. ii. S. 101 u. 146. 



" Length half a line ; body slender, nearly cylindrical ; extremities acute. Colour 

 dark grey or brownish, with a darker line in the centre of the anterior extremity, denoting 

 an internal organ. Two very conspicuous black specks, resembling eyes, are seated just 

 at the origin of the anterior pellucid part. 



' The account of this genus, so far, has been taken from Diesing's 'Syst. Helminth.' p. 128. 



