128 MR. H. CHARLTON BASTIAN’S MONOGRAPH 
Spear 3355" long. (Esophagus jth of total length; centre of globate swelling i 
from anterior extremity. Intestine covered with rather coarse, scattered granules, Anis 
745” from posterior extremity. Vulva slightly posterior to anterior $rds of body, Zr. 
eretory duct opening opposite commencement of posterior third of esophagus. 
Male, not seen. 
Hab. From sandy soil, adhering to rootlets of wheat-plant, Broadmoor, Berks, 
4. T. oprusus, n.sp. (Plate X. figs. 117, 118.) 
Female, length 35", breadth 725". 
External Characters.—Body. tapering very slightly anteriorly, and still less poste- 
riorly, where it is blunt and rounded. Head rather truncate.  Striw transverse, sg} y 
‘apart. 
Spear irys long. (Esophagus yrth of total length, having a globate swelling about 
its middle. Intestine sparingly covered with light-coloured granules. Anus Z45” from 
posterior extremity. Vulva near commencement of posterior third of body. Æreretory 
duct opening slightly posterior to middle of cesophagus. 
Male, length 35", breadth 4215". 
Anus 565 from posterior extremity. Spicules 5555 long. Accessory piece about 
half as long, posterior, median. Ale membranous and transparent, extending on either 
side from a little above anus to posterior extremity. P 
Hab. Sandy soil, about the rootlets of oats, Broadmoor, Berks. 
5. T. pırsacı, Kühn. 
Anguillula Dipsaci, J. Kühn, in Schles. Jahresber. 1857, pp. 50-53.—Idem, in Zeitsch. für Wissensch. 
Zool. ix. (1857) 129-137, tab. vii. C.— Diesing, Sitzungsb. der Kais. Akad. Bd. xlii. (1861) p. 628. 
“ Corpus antrorsum attenuatum transparens. Caput obtusum, rotundatum. Cauda 
sensim acuminata recta v. paulo incurvata. Apertura genitalis feminea retrorsum sita. 
Ovipara. Longit. corp. 4-3”, crassit. 14”; longit. caudæ maris (a pene) 4.5, feminæ (a 
vulva) $ corporis longitudinis." 
“ (Esophagus postice bulbosus.” 
“ Hab. In anthodiis depravatis Dipsaci fullonum, Junio (Kühn).” 
6. T. AGROSTIDIS. 
Vibrio graminis, Steinbuch, in Naturf. xxviii. St. p. 233, tab. v., et ejus Analecten, 97, 135, tab. ii. figs. 1-6. 
Anguillula graminearum (in part), Diesing, Syst. Helminth. ii. p.132. 
It seems to me most probable that this species is distinct from Tylenchus tritici; the 
determination of this question, however, must be left to future observers. 
13. RHABDITIS, Dujardin. 
Anguillula, Grube. 
GEN. CHAR. Body tapering at extremities. Caudal sucker none. Integument having 
longitudinal as well as transverse strive; setæ none ; papillæ none. Pharyngenl 
cavity long cylindrical. Esophagus distinctly muscular, having two swellings 
