ON THE ANGUILLULID^. 145 



mistakeably made out in the typical species L. elongatmn ; 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. elongatmn, 

 and still more convinced that his P. bacillata is intimately allied to L. gracile-. 

 Wli ether 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. ELONGATTJM, n. sp. (Plate XII. figs. 156, 157.) 

 Male, length f", breadth 2^". 



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 

 striae visible. 



(Esophagus \ih. 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. Amis -^" from posterior extremity. Spicules ^" 

 long, broad in the middle, but tapering at extremities ; accessory pieces xcmo" loi^a- 

 Ocelli two conical carmine-coloured masses on dorsum of oesophagus, ■^" from anterior 

 extremity. Excretory glands two, tubular, extending along anterior two-thirds of oeso-. 

 phagus, and opening one on each side of head, Twm" fro'^ l^^^l ^^ anterior extremity. 



Female, not seen. 



Hah. In a small dull-reddish sponge between crevices of stones from estuary, Palmouth, 



2. L. PUNCTATUM. 



Phanoglene punctata, Eberth, Untersuch. iiher Nemat. p. 20, tab. ii. figs. 5-7- 



" Korper ilberall von fast gleicher Dicke, starker verschmalert nach vorn,, hinten in 

 eine stumpfe Spitze auslaufend, leicht gegen den Bauch concav, mitunter auch starker 

 eingerollt. Das terminale Ende hier und da leicht nach unten eingebogen. Hinterende 

 des Mannchens etwas schmaler als das vom "Weibchen. Mundoifnung eine leichte Grube, 

 kurz hinter ihr auf der Bauch- und Riickenflache zwei kleine Haare 



"Weibchen 4-5 Mm. laug, 0-10 Mm. breit. Mannchen 75-8 Mm. lang, 0-1 Mm, 

 breit. 



" Oesophagus =ein Eiinftel der Korperlange. 



" Eab. Villafranca, unter Seepflanzen." 



3. L. GRACILE, n. sp. (Plate XII. figs. 158-160.) 

 Female, length \", breadth ^33". 



' Although he merely represents a terminal portion of one excretory gland, and does not depict its commence- 

 ment 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. XXV. U 



