ON THE ANGUILLULIDÆ. 113 
3, A. FLUVIATILIS, Hemprich & Ehrenberg, 
Ferskoands Aal, Strackker, in Nye Samml. of Dansk. Vid. Selsk. Skr. iii. D. 33. 
> Corculum vermiculo simile, Linné, Amoen. Acad. (mundus invis.). 
Vibrio anguillula, y. Anguillula fluviatilis, Müller, Anim. Infusor. 65. tab. ix. 5-8. (Reliqua synon. Mülleri 
vel incerta, vel ad Anguillulam tritici aut Lumbrici pertinent.) ; 
Vibrio fluviatilis, Bory, in Encycl. Méth. 1824, p.777, tab. iv. 20-23.— Idem in Dict. Class. d’Hist. Nat. 
xvi. 586 (les Oxyurides), tab. v. A, 39.—Blainville in Dict. des Sc. Nat. lvii. 537, et lviii. 71. 
Anguillula fluviatilis, Hemprich et Ehrenberg, Symb. Phys. Phytoz. Entoz. tab. ii. 8 et 13 (libyca).—Eh- 
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 triplo quadruplove longior. 
Longit. 3-3". —Diesing. 
* Corpus subtilissime transverse striolatum, subannulatum. Tubus cibarius hine ore 
illinc ano terminatus, simplex, cum strictura cardiaca. Os terminale, anus ad caudæ 
basim lateralis. Feminarum apertura genitalis in medio corpore. Uterus bicornis. 
Ova ovata. Foetus maturus bis complieatus. Feminæ maribus majores. Maris penis sim- 
plex nee vaginatus. Ita in speciminibus Berolinensibus."— Ehrenberg, Symb. Phys. l. c. 
* Hab. In aqua dulci in Dania (O. F. Müller).—Inter Confervas, in aqua Oaseos Jovis 
Hammonis Siwæ, nec non pagi Tor in Arabia.—In Sibiria prope Tobolsk, in montibus 
altaicis prope Semimogorsk et prope Berolinum (Ehrenberg). — Diesing. 
The few definite characters given above, such as * corpus subtilissime transverse strio- 
latum" and “uterus bicornis,” seem pretty positively to indicate that this species does 
not in reality belong to the genus Anguillula. Any free Nematodes other than the 
“paste-” or “vinegar-eels,” or the Tylelenchus tritici, which have been accidentally met 
with or referred to by most English writers hitherto, have been provided with the con- 
venient name of Anguillula fluviatilis; so that the 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 
Plectus, judging from the characters above mentioned, as well as the abundance and 
vide distribution of the animals of this type. 
4. À. INFLEXA, Hemprich & Ehrenberg. 
Anguillula inflexa, Hemprich et Ehrenberg, Symb. Phys. Phytoz. Entoz. tab. i. 12 (Vibrio fluviatilis 
niloticus).—Dujardin, Hist. Nat. des Helminthes, 244.—Diesing, Syst. Helminth. ii. 131. 
“Cauda longiore subulata, maris inflexa, baseos crassitie plus decuplo longiore, cor- 
Doris fere octavam partem æquante. Longit. mar. 4-4”, crassit. 4; fem. 4-1”, 
crassit. 4L". 
_ “ Hab. Inter Confervas aquæ Nili in provincia Dongola Nubiæ eandem formam cepisse 
monet cel. Ehrenberg, quam serius in aqua salsa prope Petropawlofsk in Sibiria et 
Prope Berolinum reperiit.” | 
5. A. CoLUBER, Hemprich & Ehrenberg. 
Vibrio coluber, Müller, 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 
