ON THE ANGUILLULID.E. 149 



distinct. Anus ^" from posterior extremity. Vulva slightly posterior to middle of 

 body. Excretory ventral gland tubular, extending from posterior part of oesophagus to 

 about the termination of anterior third. 



Male, length \", breadth xwo"- 



Rather stouter than female, especially at -posterior extremity; tail tapering more 

 abruptly behind anus ; small setae scattered over posterior part of body ; below anal cleft 

 are two strong setae, 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 35^00'' apart for some distance above 

 anal cleft. 



Spicules brownish yellow, strong, curved, y^" in length ; accessory pieces of sanfe 

 colour, ■^\^" long, slightly curved, and somewhat wedge-shaped. Supplementary organ 

 eV' above anus, brownish yellow, large, infundibulLform, ^^0" long 5 internal expanded 

 portion becoming thin and rather iuchstinct. 



Sab. About the roots of Corallina officinalis from tide-pools, Falmouth. 



2. E. DujARDiNii, n. sp. (Plate XII. figs. 168-170.) 

 Female, length \", breadth too"- 



External Characters. — Body very pellucid, tapering slightly anteriorly, but consider- 

 ably behind anus. Head narrowed, rounded, having four crucially arranged papillae 

 around mouth, and behind these a circlet of 10-12 strong patent setae ; no other setae 

 visible. Integument very transparent, with almost imperceptible transverse and also 

 longitudinal markings. 



Teeth three, same as in last. (Esojihagus between ^th and yth 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-colovired, tessellate aggre- 

 gations of fat-particles only about ^oV i^ diameter. Anus -^q" from posterior extre- 

 mity. Vulva very slightly posterior to the middle of body. Excretory ventral duct 

 opening opposite termination of anterior third of oesophagus. 



Male, about same size as female, but slightly narrower. Posterior extremity ter- 

 minating with three minute setae ; single median row of long narrow setae 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, xis" ^ong; accessory pieces about half as 

 long. Supplementary organ -^" above anus, much longer, as compared with breadth of 

 body, than in last species. 



ILab. In sand and about roots of Algae from tide-pools, Falmouth. 



3. E. PIGMENTOSTJS, n. sp. (Plate XII. figs. 171, 172.) 

 Female, length ^", breadth yoo"- 



External Characters.— Bodj tapering slightly forwards ; posterior extremity behind 

 anus elongated, conical, terminating with distinct rounded sucker, but no setae. Head 

 bluntly rounded ; mouth surrounded by four rather smaller papillae ; and behind them is 



