ON THE ANGUILLULIDÆ. 157 
Pharyngeal cavity rounded. (Esophagus between ith and $th of total length. Intes- 
fine abundantly covered with fat-partieles having no distinct tessellate arrangement. 
Anus „45 from posterior extremity. Spicules 345 from point to point; accessory 
pieces curved backwards, and pyriform in shape. 
Female, not seen. 
Hab. Marine surface mud from estuary, Falmouth. 
9 T. VELOX, n. sp. (Plate XIII. figs. 189-191.) 
Female, length +s”, breadth 437". 
Erternal Characters.—Body tapering slightly forwards, but rather abruptly behind 
vulva, and. thence gradually to pointed posterior extremity. Head rounded, provided 
with 4-6 setze, which are rather long, and directed forwards. Transverse striæ well 
marked, 15355 apart; convex lateral prominences of integument 5000 in diameter, at 
rdo” from anterior extremity. 
Pharyngeal cavity rounded, 33555" deep. (Esophagus about $th of total length, nearly 
cylindrical. Intestine moderately well covered with olive-brown fat-particles, having a 
tessellate arrangement. Anus -45” from posterior extremity. Vulva at commence- 
ment of posterior third of body. Vaginal glands pyriform granular bodies, unequal, the 
posterior being much the larger and 19359 long. 
Male, not seen. 
Hab. About roots of small green sea-weed from tide-pools, Falmouth. 
24. SPHÆROLAIMUS !, Bastian. 
Gex. CHAR. Body tapering at extremities. Caudal sucker minute; sucker-tubes not 
visible. Integument having transverse and longitudinal markings; sete abundant ; 
cephalie papillæ absent. Pharyngeal cavity large and somewhat spherical, having 
peculiar sets of parietal linear markings. (Esophagus distinctly muscular, canal 
defined by three rather bright bands. Intestine rather densely covered with dark- 
coloured hepatic particles. Vulva considerably posterior to middle of body. Uterus 
unsymmetrical. Spicules long and narrow. Accessory piece single, posterior, some- 
what shield-shaped. Ocelli none. Vaginal gland single, pyriform, posterior. Ex- 
cretory ventral gland tubular, opening near middle of œsophagus. Lateral 
canals . ... 
Movements rapid, powerful. 
S. uırsurus, n. sp. (Plate XIII. figs. 192-194.) 
Female, length 455", breadth 433". 
External Characters.—Body thick in proportion to length, tapering slightly anteriorly, 
but more considerably towards posterior extremity, which is slightly swollen and rounded 
at termination; covered with rather long setze, which are largest and most numerous 
about anterior extremity. Head rounded, somewhat conical. Integument having trans- 
verse strie 15455" apart, and an appearance of longitudinal also, 10300 apart. 
; cpalpa, a globe, and Aaıpos, the throat. 
