ON THE ANGUILLULIDÆ. 145 
mistakeably made out in the typical species L. elongatum ; in both these other two species 
I have as yet failed to detect any structure, either simple or double, answering to the 
excretory gland. 
After a careful examination of Eberth’s figures, however, I feel almost sure that 
his Phanoglene punctata presents the same type of structure! as my L. elongatum, 
and still more convinced that his P. bacillata is intimately allied to Z. gracile. 
Whether belonging to this or more correctly to another, it is also evident that his 
Enoplus coronatus and my .L. figuratum must be included in the same genus. 
I have constituted this new genus, and removed from the genus Phanoglene the species 
placed in it by Eberth, on account of the improbability that these marine forms would 
agree in structure with the freshwater type of Nordmann’s genus. 
1. L. ELONGATUM, n.sp. (Plate XII. figs. 156, 157.) 
Male, length 2^, breadth 415". 
External Characters.—Body cylindrical, filiform, tapering but very slightly at extre- 
mities. Sucker not prominent; sucker-tubes two, long, tubular, the terminations being 
blunt and rounded. Head slightly narrowed, rounded, naked. Integument plain; no 
striæ visible. 
Esophagus 7th of total length, slender, nearly uniform in size, and free from pigment, 
surrounded by ring near.end of anterior third. Intestine scarcely recognizable, from the 
almost total absence of hepatic particles. Anus 315" from posterior extremity. Spicules de” 
long, broad in the middle, but tapering at extremities; accessory pieces +555 long. 
Ocelli two conical carmine-coloured masses on dorsum of esophagus, 345 from anterior 
extremity. Eixeretory glands two, tubular, extending along anterior two-thirds of œso- 
phagus, and opening one on each side of head, 41455" from level of anterior extremity. 
Female, not seen. 
Hab. In a small dull-reddish sponge between crevices of stones from estuary, Falmouth. 
2. L. PUNCTATUM. 
Phanoglene punctata, Eberth, Untersuch. über Nemat. p. 20, tab. ii. figs. 5-7. 
“ Körper überall von fast gleicher Dicke, stärker verschmälert nach vorn, hinten in 
eine stumpfe Spitze auslaufend, leicht gegen den Bauch concav, mitunter auch stärker 
eingerollt. Das terminale Ende hier und da leicht nach unten eingebogen. Hinterende 
des Männchens etwas schmäler als das vom Weibchen. Mundóffnung eine leichte Grube, 
kurz hinter ihr auf der Bauch- und Rückenflüche zwei kleine Haare . . . . .. 
; “Weibchen 45 Mm. lang, 0:10 Mm. breit. Männchen 7:5-8 Mm. lang, 0'1 Mm. 
reit. 
“ Oesophagus=ein Fünftel der Kôrperlänge. 
“ Hab. Villafranca, unter Seepflanzen.” 
3. L. GRACILE, n. sp. (Plate XII. figs. 158-160.) 
Female, length 3^, breadth 15". 
133 
: Although he merely represents a terminal portion of one excretory gland, and does not depict its commence- 
-- anteriorly, I think he has very possibly overlooked the other, and also the lateral openings so close to the 
anterior extremity. This very unusual arrangement seems not to have been detected by him. 
VOL. xxy, U 
