ON THE ANGUILLULIDÆ. 117 
ticles, tessellated. Anus 4” from posterior extremity. Vulva slightly anterior to 
middle of body. 
Male rather shorter, more slender, and transparent breadth being 535". Anus 1 
posterior extremity. Spicules curved, 5,451" long. Accessory portion well marked, 
from 
rss long. 
Hab. With Diatomaceæ from the decaying lower leaves of Myriophyllum verticil- 
latum, pond, Bagshot. 
Has a habit, when touched, of straightening itself, and remaining perfectly still for a 
few seconds. 
9, D. ALBUS, n. sp. (Plate X. figs. 74, 75.) 
Female, length 455", breadth sig. 
Erternal Characters.—Body white, rather stout, tapering very slightly forwards, but 
considerably backwards, where it terminates in a short filiform extremity. Head bluntly 
rounded. Integument having longitudinal and transverse stris. 
Pharyngeal cavity large, cup-shaped, with valvular plates at bottom. (Esophagus sth 
of total length, having the usual median swelling > 1.” long. Intestine slightly covered 
with light-coloured fat-particles. Anus six” from posterior extremity. Vulva in 
middle of body. 
Male, not seen. 
Hab. About rootlets of wheat from sandy soil, Broadmoor, Berks. 
3. D. FILIFORMIs, n. sp. (Plate X. figs. 76-78.) 
Female, length 4", breadth 1000 - 
External Characters.—Body white and very slender, tapering very slightly anteriorly, 
but very considerably behind, where it terminates in a long filiform extremity. Integu- 
ment with longitudinal stri: 030, , and transverse ho apart. 
Pharyngeal cavity cup-shaped, with horny plates at bottom. Œsophagus about jth 
of total length, with usual swelling of mid portion. Intestine covered sparingly with 
light-coloured granules. Anus 33; from posterior extremity. Vulva at middle of 
body. 
Male, length 24”, breadth 4353 - 
Anus „45° from posterior extremity, 
not be detected, though the genital tube could be readily seen in 
Hab. Same as last. 
I could detect no sucker with the microscope, though I feel confident that such a 
structure, however minute, must exist, since I have seen the male of this species swaying 
violently about in all directions, the extremely fine extremity of thread-like tail only 
remaining in a fixed position. | 
which is longer than in female. Spicules could 
front of the anus. 
4. D. mrcaxs, Max Schultze. 
V. Carus's Icones Zootomicze, tab. viii. 1. 
No description or reference. 
Hab. Unknown. 
