ON THE ANGUILLULIDÆ. 149 
distinct. Anus 74 from posterior extremity. Vulva slightly posterior to middle of 
body. Æxcretory ventral gland tubular, extending from posterior part of cesophagus to 
about the termination of anterior third. 
- Male, length 1^, breadth 190 - 
Rather stouter than female, especially at posterior extremity; tail tapering more 
abruptly behind anus ; small setze scattered over posterior part of body ; below anal cleft 
are two strong setze, one on each side of middle line; and above, between it and supple- 
mentary organ, is a single median row of about sixteen longer and more slender bristles. 
Strong obliquely transverse markings of integument 3555 apart for some distance above 
anal cleft. 
Spicules brownish yellow, strong, curved, 190 in length; accessory pieces of same 
colour, 313" long, slightly curved, and somewhat wedge-shaped. Supplementary organ 
+” above anus, brownish yellow, large, infundibuliform, 335" long; internal expanded 
portion becoming thin and rather indistinct. 
Hab. About the roots of Corallina officinalis from tide-pools, Falmouth. 
2. E. DuJARDINIIL, n. sp. (Plate XII. figs. 168-170.) 
Female, length +”, breadth 150 - 
External Characters.—Body very pellucid, tapering slightly anteriorly, but consider- 
ably behind anus. Head narrowed, rounded, having four crucially arranged papillæ 
around mouth, and behind these a circlet of 10-12 strong patent setze; no other setæ 
visible. Integument very transparent, with almost imperceptible transverse and also 
longitudinal markings. 
Teeth three, same as in last. (Esophagus between 4th and +th of total length; pig- 
ment-lines and markings well developed anteriorly, but no very distinct local aggre- 
gations. Intestine broad, densely covered with small, dark-coloured, tessellate aggre- 
gations of fat-particles only about sogo in diameter. Anus d; from posterior extre- 
mity. Vulva very slightly posterior to the middle of body. ÆExcretory ventral duct 
opening opposite termination of anterior third of cesophagus. 
Male, about same size as female, but slightly narrower. Posterior extremity ter- 
minating with three minute setz; single median row of long narrow setze between anus 
and supplementary organ; the two posterior to anus not present, neither were any small 
ones scattered over posterior part of body recognized. 
Spicules brownish yellow, strong, curved, 145” long; accessory pieces about half as 
long. Supplementary organ 25" above anus, much longer, as compared with breadth of 
body, than in last species. 
Hab. In sand and about roots of Algæ from tide-pools, Falmouth. 
3. E. PrewENTOsUs, n.sp. (Plate XII. figs. 171, 172.) 
Female, length 3^, breadth 435". 
External Characters.—Body tapering slightly forwards; posterior extremity behind 
anus elongated, conical, terminating with distinct rounded sucker, but no sete. Head 
bluntly rounded ; mouth surrounded by four rather smaller papillæ ; and behind them is 
