ON THE ANGUILLULID^. 113 



3. A. FLUviATiLis, Hemprich & Elirenberg. 



Ferskoands Aal, Strackker, in Nye Samml. of Dansk. Vid. Selsk. Skr. iii. D. 33. 



? Corculum vermiculo simile, Linne, Amoen. Acad, (mundus invis.). 



Vibrio anguilhda,'^. Anguillula fluviaiilis, Mlillcr, Anim. Infusor. 65. tab. ix. 5-8. (Reliqua synon. Miilleri 

 vel incerta, vel ad Anguillulam tritici aut Lumbrici pertinent.) 



Vibrio fluviaiilis, Bory, in Encycl. Meth. 1824, p. 777, tab. iv. 20-23. — Idem in Diet. Class. d'Hist. Nat. 

 xvi. 5S6 (les Oxyurides), tab. v. A, 39.— Blainville in Diet, des Sc. Nat. Ivii. 537, et Iviii. 71. 



Anguillula fluviatills, Hemprich et Ehrenberg, Symb. Thys. Phytoz. Entoz. tab. ii. 8 et 13 {Ubyca). — Eli- 

 renberg, Organ. Syst. u. geogr. Verb. d. Infusionsth. 1830, pp. 10, 15, 68, 105, tab. vii. 5 ; ejus In- 

 fusionsth. 82. — Dujardin, Hist. Nat. des Helminthes, 244. — Diesing, Syst. Helminth, ii. 130. 



" Cauda recta brevi conica, subulata, baseos crassitie triple quadruplove longior. 

 Longit. i-^'"." — Diesing. 



" Corpus subtilissime transverse striolatum, sixbannulatum. Tubus cibarius bine ore 

 illinc ano tcrminatus, simplex, cum strietura cardiaca. Os terminale, anus ad cauda3 

 basim lateralis. Eeminarum apertura genitalis in medio corpore. Uterus bicornis. 

 Ova ovata. Foetus maturus bis complicatus. Feminse maribus majores. Maris penis sim- 

 plex nee vaginatus. Ita in speciminibus Berolinensibus." — Ehrenberg, Symb. Phys. I. c. 



" Sab. In aqua dulci in Dania (O. F. Milller). — Inter Confervas, ia aqua Oaseos Jovis 

 Hammonis Siwa3, nee non pagi Tor in Arabia. — In Sibiria prope Tobolsk, in montibus 

 altaicis prope Semimogorsk et prope Berolinum {Ehrenberg)." — Diesing. 



Tbe few definite cbaracters given above, sucb as " corpus subtilissime transverse strio- 

 latum" and "uterus bicornis," seem pretty positively to indicate tbat tliis species does 

 not in reality belong to tbe genus AnguilMa. Any free Nematodes otber tban tbe 

 "paste-" or "vinegar-eels," or tbe Tylelenchus tritici, wbich bave been accidentally met 

 witb or referred to by most English writers bitberto, bave been provided with tbe con- 

 venient name of Anguillula Jliwiatilis ; so tbat tbe altogether doubtful animal to which 

 this cognomen rightly belongs has been invested with a pseudo-popularity for which, in 

 all probability, it could make but little valid claim. It may perhaps belong to the genus 

 Flectus, judging from the characters above mentioned, as well as the abundance and 

 wide distribution of the animals of this type. 



4. A. INFLEXA, Hemprich & Ehrenberg. 



Anguillula inflexa, Hemprich et Ehrenberg, Symb. Phys. Phytoz. Entoz. tab. i. 12 [Vibrio fluviaiilis 

 witoiicM*).— Dujardin, Hist. Nat. des Helminthes, 244.— Diesing, Syst. Helminth, ii. 131. 



" Cauda longiore subulata, maris inflexa, baseos crassitie plus decuplo longiore, cor- 

 poris fere octavam partem sequante. Longit. mar. \-^" , crassit. ^4" ; fern. ^-1'", 

 crassit. ■^"'. 



" ILab. Inter Confervas aqua? Nili in provincia Dongola Nubise eandem formam cepisse 

 monet eel. Ehrenberg, quam serins in aqua salsa prope Petropawlofsk in Sibiria et 

 prope Berolinum reperiit." 



5. A. COLUBER, Hemprich & Ehrenberg. 



Vibrio coluber, Miiller, Anim. Infus. 62, tab. viii. 16-18. 



Anguillula coluber, Hemprich & Ehrenberg, Symb. Phys. Phytoz. Entoz. — Dujardin, Hist. Nat. des 

 Helm. 244.— Diesing, Syst. Helminth, ii. 131. 

 VOL. XXV. Q 



