ON THE ANGUILLULIDÆ. 133 
1. S. LONGICOLLIS, n. sp. (Plate XI. figs. 119-122.) - 
Female, length $^, breadth 33>”. 
External Characters.—Body smooth ; anterior extremity tapering much, long, and 
marrow ; posterior tapering more quickly. Caudal sucker well developed. Head trun- 
cate, naked. Integument with an appearance of longitudinal markings, sooo apart. 
Pharyngeal cavity somewhat fiddle-shaped, length +4", having funnel and three cir- 
cular markings. Two circular, highly refracting, colourless bodies (on esophagus ?) 
near termination of pharyngeal cavity. (Esophagus ith of total length. Intestinal cells 
large, from 1959 tO 500 in diameter, containing an abundance of dark fawn-coloured 
granules, sometimes varying in shade in contiguous cells, and these themselves often 
very irregularly disposed. Anus ris” from posterior extremity. Vulva slightly poste- 
rior to middle of body. Ocelli none. Glandular system around middle third of œsophagus 
highly developed, and also at posterior extremity behind anus. Eixeretory ventral duct 
opening at 565 from anterior extremity. 
Male, slightly larger than female. 
Anus 555 from posterior extremity. Spicules long and narrow, very slightly curved, 
Hab. From tide-pools, on Cladophora rupestris and other fine green and brown weeds 
on which Diatomaceæ abound, Falmouth and Brighton. 
2. S. TENUICOLLIS. 
Enoplus tenuicollis, Eberth, Untersuch. über Nematoden, 1863, p. 41, tab. iv. fig. 16, tab. v. figs. 1 & 2. 
“Körper fast gerade, cylindrisch, gegen beide Enden ziemlich gleich stark ver- 
schmälert. Hinterende bei dem Weibchen gerade, bei dem Männchen eingerollt. Kopf 
quer abgestutzt. Schwanz mit einer grösseren Papille versehen.” 
“Länge des Weibchens 6 Mm., Breite 0:15 Mm. 
“Länge des Männchens 4:5 Mm., Breite 0:09 Mm. 
" Oesophaguslinge—1 der Körperlänge”. 
3. S. VIVIPARA, n.sp. (Plate XI. figs. 123-125.) 
Female, length 44", breadth 41". 
External Characters.—Body tapering considerably at extremities, especially at pos- 
terior, which is long, filiform, and terminates with a minute sucker. Head slender, 
tounded, provided with a cirelet of 6-8 spreading sete. Integument with longitudinal 
markings about 10605 apart. 
Pharyngeal cavity of a somewhat elongated-oval shape, containing no funnel or cir- 
cular markings (?), 1445” in length. (Esophagus about ith of total length, gradually 
widening posteriorly, and embraced by a glandular ring at about its middle. Intestine 
regularly and rather sparsely covered with somewhat large fat-particles. Anus 414^ 
from posterior extremity. Vulva in centre of body. Uterus bifid. Segments symme- 
description of this, as well as other species discovered by him, I have merely given the externe pereden, 
his memoir, in addition to beautiful coloured drawings of each species, will be found lengthy descriptions, including 
TT Interesting and accurate anatomical details. It should be consulted by all interested in this subject. 
