ON THE ANGUILLULID/E. 127 



An{/uille vulgaire, Rozier, Obs. 1775, Mars, p. 218, tab. i. 7, et 1778, Nov. p. 401. 

 Anr/uiUe du bU rachitique, 1. c. 1775, Janv. tab. i. 



Anguille da faux ergot, 1. c. 17 76, Janv. p. 7-, et Mars, pp. ,$73 et 4.36 ; Naturf. xxix. St. 40. 

 Spallanzani, Micr. 1S9. fig. 12 (pessima); idem, Opusc. Phys. ii. 354, tab. v. 10. 

 Eichhorn^ Micr. 72, tab. vii. A. 

 Gleichen, Micr. 61, tab. xxvlii. 6. 

 SpuJilwilrmerdlchen, Schrank, Beitr. 19; Wiirtemb. Wochenbl. 1782, p. 354. 

 Vibrio anguilhda, <y. Anguillula fluviatilis, Miiller, Aniin. Infus. 65, tab. ix. 5-8. 

 F. tritici, Bauer, in Phil. Trans. 1823, i. 1-12, tab. i. et ii. — Ver.sio in Ann. des Sc. Nat. (prem. ser.) ii. 



154-167, cum tabula. — Bory, in Encycl. Meth. 1824, p. 779- — Duges, in Ann. des Sc. Nat. (prem. 



s^r.) \x. 225. — Henslow, in Microscopical Journal, 1841, p. 36. 

 Rhabditis tritici, Duj., Hist. Nat. des Helminthes, p. 242. 

 Anguilhda graminearum, Diesing, Systema Helminthum, 1850, vol. ii. p. 132. 

 Anguillules de ble, Davaine, in Comptes Rendus, xli. (1855) 435-438 (de mode propagationis et immigra- 



tiouis in semina frumenti). — Idem, ibid, xliii. (1856) 148, et in Institut, no. 1179 (1856) 281 (de 



tenacitate vitae in individuis organisgenitalibus adhuc destitutis). — Idem, Recherches sur 1' Anguillula 



du ble nielle, Paris, 1857, avec 3 pi. 



Female ', length \", breadth xit"- 



External Characters. — Body yellowish white, tapering rather abruptly forwards, but 

 more gradually towards posterior extremity. Head rounded ; no setae or papillae. Trans- 

 verse striae of integument not very distinct, 20^0^" apart. 



Spear small, only -2-5V0 " long. (Esophagus about a'jth of total length ; middle of swel- 

 ling 4"oo'' fi'om anterior extremity. Intestine much obscured by genital tubes, covered 

 with irregularly arranged fat-particles. Anus -^^" from posterior extremity. Vulva 

 rather prominent, -g^-" from posterior extremity. Anterior uterine segments and ovari/ 

 largely developed. General cavity of body filled with delicate parenchymatous or 

 hyaline cells. Excretory duct opening at x^" from anterior extremity, and, in favour- 

 able specimens, visible for about ^" as a somewhat rigid, almost linear, curved tube. 

 Lateral vessels most distinct, about 3^^^" in breadth, often much convoluted anteriorly^. 



Male, length -^"y breadth 3^x2^". 



Anus a-g-s" from posterior extremity. Sjncnles rather broad, s'is" long. Accessory 

 piece connected with spicules, ytts" long. Alee narrow, transparent, extending from 

 sza' above anus to posterior extremity. 



Hab. In gall-like growths, replacing germens in certain ears of wheat, also more 

 rarely in those of oats and rye. 



3. T. TERRICOLA, n. sp. (Plate X. figs. 115, 116.) 



Female, length -^f", breadth x^so"'- 



External Characters. — Body pellucid, tapering slightly forwards, but more posteriorly. 

 Strise of integument transverse. 



' Absolute measurements of both male and female rather variable ; the relative measurements, however, remain 

 pretty constant. 



- These are not fised to the parietes of the body in the same way as the axial tubes or vessels of the lateral lines in 

 certain parasitic Nematoids, but tloat freely in the cavity of the body. When the integument of one of these animals 

 is ruptured by pressure of the covering-glass mider the microscope, I have several times seen whole coils of the vessels 

 slip entirely out of the cavity of the body. 



