ON THE ANGUILLULIDA. 155 
posteriorly than anteriorly. Head truncated or obtusely rounded, surrounded by setze, 
some directed forwards and others spreading, the latter continuing for some distance 
over anterior part of body. Integument very thin ; no markings visible. 
Pharyngeal cavity cup-shaped, 55507 deep. (Esophagus „th of total length. Jntes- 
fine well covered with cells presenting a tessellate arrangement, and containing light- 
coloured granules. Vulva slightly anterior to middle of body; seven minute suctorial 
eminences in median line before and behind it, about i355" apart. Anal glands con- 
sisting of four distinct masses. Eiveretory duct opening near middle of cesophagus. 
Lateral canals faintly granular, occupying about 3th of circumference of body. 
Male, not seen. 
Hab. In sand at roots of sea-weed from tide-pools, Falmouth. 
2. L. ELONGATUS, n. sp. (Plate XII. figs. 180, 181.) 
Male, length 455", breadth 433". 
External Characters —Body very long and filiform, not tapering at all anteriorly, 
and but very slightly immediately before termination. Head bluntly rounded, furnished 
with a circle of eight setæ, directed forwards. Integument thin, presenting longitudinal 
markings 15400 apart. 
Pharyngeal cavity nearly rectangular, depth 5555", having three thin horny laminæ 
continued backwards (into substance of cesophagus), with rounded and minutely serrated 
edges. (Esophagus about $th of total length. JIntestine covered with cells having a 
tessellate arrangement; individual cells containing rather few granules. Anus 35" 
from posterior extremity. Spicules of moderate length, curved; accessory pieces thin, 
flat, blade-like. Anal glands four large, somewhat quadrate, granular bodies, lying 
between anal cleft and sucker-tubes. Æxcretory duct opening near middle of cesophagus. 
Female, not seen. 
Hab. With Symplocostoma tenuicollis and Ohromadora vulgaris on fine filamentous 
green weed from tide-pools, Falmouth. 
29. TACHYHODITES', Bastian. 
GEN. CHAR, Body tapering at extremities. Caudal sucker very small; no sucker-tubes 
Visible. Integument having transverse striæ ; cephalic setæ present ; papillæ absent. 
Pharyngeal cavity very small, indistinct. Œsophagus almost cylindrical. Intestine 
rather sparingly covered with light olive-coloured hepatic granules. Vulva poste- 
rior to centre of body. Uterus unsymmetrical. Spicules rather narrow, curved. 
Accessory pieces nearly straight, pointed, and directed backwards.  Ocelli(?) 
two bright colourless bodies on upper surface of esophagus. Æxvcretory ventral 
D... Lateral canals . . . + .. 
Movements very rapid. 
l. T. xaraxs, n. sp. (Plate XIII. figs. 182-184.) 
Female, length 3”, breadth 343”. um 
External Characters.—Body tapering towards either extremity, but principally towards 
! rays, swift, and ölirns, a traveller. 
x 2 
