166 MR. H. CHARLTON BASTIAN’S MONOGRAPH 
long; accessory pieces ovate, leaf-like, about rd as long, rather indistinct, Anal 
glande: Excretory ventral duct. . , . « . 
Female, not seen. 
Hab. Marine surface-mud from estuary, Falmouth. 
2. S. INÆQUALIS, n. sp. (Plate XIII. figs. 223-225.) 
Female, length 45", breadth 335". 
External Characters.—Body tapering as in last species. Head slightly rounded, 
provided with 2-4 spreading sete. Integument with well-marked transverse síriy, 
15400 apart, and two longitudinal lines of dots, about 55455 apart, on each side of the 
body. 
Pharyngeal cavity cup-shaped, rather indistinct, having two apophyses extending 
backwards for about qsg”, the third being small and abortive. Œsophagus 4th of total 
length, with post-pharyngeal and terminal swellings. Intestine covered pretty uni. 
formly with large olive-yellow-coloured fat-particles. Anus 545” from posterior extre. 
mity. Vulva slightly posterior to middle of body. — Excretory ventral duct ...... 
Male, about same size or rather larger. 
Anus 335° from posterior extremity. Spicules narrow, slightly curved, royo” long; 
accessory pieces indistinct. In mid-ventral region, anterior to anal cleft, is a linear 
series of about fifteen small, bright, rectangular spots, equidistant and zogo apart. 
Hab. Marine surface-mud of estuary, Falmouth. : 
9. S. ROBUSTA, n.sp. (Plate XIII. figs. 226, 227.) 
Female, length 4*5", breadth 41,5". 
External Characters.—Body stout, of a brownish-yellow colour, scarcely tapering at 
all anteriorly, but very abruptly posterior to anus. Head rounded, naked. Integument 
with rows of dots, transverse, and 13355" apart. 
Pharyngeal cavity large, 4955" deep, longitudinal ribs well marked; three very thick 
and nearly straight apophyses extending backwards for 4:555". (Esophagus 4th of total 
length, cylindrical, and nearly uniform in size. Intestine covered with large, yellowish 
granules having a tessellate arrangement. Anus 515" from posterior extremity. Vulva 
slightly anterior to middle of body. Uterus bifid. Excretory ventral gland extending 
from about middle of @sophagus to commencement of intestine. Anal glands three, 
large, occupying nearly the whole of space posterior to anal cleft. 
Male, not seen. 
Hab. Marine surface-mud of estuary, Falmouth. 
The very large size of the apophyses, the uniform calibre of the cesophagus, and the 
apparent absence of the lateral longitudinal rows of dots are all divergences from the 
typical characters of this genus, whose value it is at present difficult to estimate, and 
more particularly so since the characters of the male are as yet unknown. 
4. S. costata,n.sp. (Plate XIII. figs. 228, 229.) 
Male, length 4^, breadth <2”. 
External Characters.—Body rather dark in colour anteriorly ; tapering conically at 
posterior extremity. Sucker cylindrical, well marked. Head truncate, having à circlet 
