ON THE ANGUILLULIDE. i 127 
Anjuille vulgaire, Rozier, Obs. 1775, Mars, p. 218, tab. i. 7, et 1778, Nov. p. 401. 
Anguille du blé rachitique, l. c. 1775, Janv. tab. i. 
Anguille du faus ergot, l. c. 1776, Janv. p. 72, et Mars, pp. 372 et 436; Naturf. xxix. St. 40. 
Spallanzani, Micr. 189. fig. 12 (pessima); idem, Opusc. Phys. ii. 354, tab. v. 10. 
Eichhorn, Micr. 72, tab. vii. A. 
Gleichen, Micr. 61, tab. xxviii. 6. 
Spuhlwürmerälchen, Schrank, Beitr. 19; Würtemb. Wochenbl. 1782, p. 354. 
Vibrio anguillula, y. Anguillula fluviatilis, Müller, Anim. Infus. 65, tab. ix. 5-8. 
V. tritici, Bauer, in Phil. Trans. 1823, i. 1-12, tab. i. et ii—Versio in Ann. des Sc. Nat. (prem. ser.) ii. 
154-167, cum tabula.—Bory, in Encycl. Meth. 1824, p. 779.—Dugés, in Ann. des Sc. Nat. (prem. 
ser.) ix. 225.— Henslow, in Microscopical Journal, 1841, p. 36. 
Rhabditis. tritici, Duj., Hist. Nat. des Helminthes, p. 242.  . 
Anguillula graminearum, Diesing, Systema Helminthum, 1850, vol. ii. p. 132. 
Anguillules de blé, Davaine, in Comptes Rendus, xli. (1855) 435—438 (de modo propagationis et immigra- 
tionis in semina frumenti).—Idem, ibid. xliii. (1856) 148, et in Institut, no. 1179 (1856) 281 (de 
tenacitate vitze in individuis organis genitalibus adhuc destitutis)—Idem, Recherches sur l'Anguillule 
du blé niellé, Paris, 1857, avec 3 pl. 
Female‘, length +”, breadth 415". 
External Characters.—Body yellowish white, tapering rather abruptly forwards, but 
more gradually towards posterior extremity: Head rounded; no setze or papillæ. Trans- 
verse striæ of integument not very distinct, 55455 apart. 
Spear small, only 33555" long. (Esophagus about „th of total length ; middle of swel- 
ling 560 from anterior extremity. Intestine much obscured by genital tubes, covered 
with irregularly arranged fat-particles. Anus 45” from posterior extremity. Vulva 
müher prominent, 415” from posterior extremity. Anterior uterine segments and ovary 
largely developed. General cavity of body filled with delicate parenchymatous or 
hyaline cells. Zxeretory duct opening at 413" from anterior extremity, and, in favour- 
able specimens, visible for about 45" as a somewhat rigid, almost linear, curved tube. 
Lateral vessels most distinct, about 4455" in breadth, often much convoluted anteriorly?, 
Male, length 45^, breadth 414". | 
Anus 335” from posterior extremity. Spicules rather broad, 5353" long. Accessory 
piece connected with spicules, 1453" long. Ale narrow, transparent, extending from 
sg 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 4”, breadth 4455". 
External Characters.—Body pellucid, tapering slightly forwards, but more posteriorly. 
Strip of integument transverse. a. 
' Absolute measurements of both male and female rather variable; the relative measurements, however, remain 
Pretty constant, 
2 These are not fixed 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 float freely in the cavity of the body. When the integument of one of these animals 
5 ruptured by pressure of the covering-glass under the microscope, I have several times seen whole coils of the vessels 
slip entirely out of the cavity of the body. 
