166 MR. H. CHARLTON BASTIAN'S MONOGRAPH 



long; accessory pieces ovate, leaf-like, about ^rd as long, rather indistinct. Atial 

 glands Excretory ventral duct 



Female, not seen. 



Kah. Marine surface-mud from estuary, Falmouth. 



2. S. iN^QUALis, n. sp. (Plate XIII. figs. 223-225.) 

 Female, length ■^^" , breadth 5^0". 



External Characters. — Body tapering as in. last species. Head slightly rounded, 

 provided with 2-4 spreading setae. Integument with well-marked transverse striae, 

 15000 " apart, and two longitudinal lines of dots, about toVo" apai't, on each side of the 

 body. 



Fharyngeal cavity cup-shaped, rather indistinct, having two apophyses extending 

 backwards for about tsVb'j tli6 third being small and abortive. (Esophagus ^th of total 

 length, with post-pharyngeal and terminal swellings. Intestine covered pretty uni- 

 formly with large olive-yellow-coloured fat-particles. Anus 2^" from posterior extre- 

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



Male, about same size or rather larger. 



Anus 2-5-2 " from posterior extremity. Spicules narrow, slightly curved, Tom'^on^; 

 accesso)^ pieces indistinct. In mid-ventral region, anterior to anal cleft, is a linear 

 series of about fifteen small, bright, rectangular spots, equidistant and ^ o\) 0" apart. 



Sab. Marine surface-mud of estuary, Falmouth. 



3. S. ROBUSTA, n. sp. (Plate XIII. figs. 226, 227.) 

 Female, length ^2''? breadth 2-2^"- 



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 rrooo" apart. 



Pharyngeal cavity large, x^^" deep, longitudinal ribs well marked ; three very thick 

 and nearly straight apophyses extending backwards for y-o-o-o"- • CEsopthagus ^th of total 

 length, cylindrical, and nearly uniform in size. Intestine covered with large, yellowish 

 granules having a tessellate arrangement. Anus ^^i" from posterior extremity. Vulva 

 slightly anterior to middle of body. Uterus bifid. Excretory ventral gland extending 

 from about middle of resophagus to commencement of intestine. Anal glands three, 

 large, occupying nearly the whole of space posterior to anal cleft. 



Male, not seen. 



Sab. 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 difiicult 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 -fg", breadth -^". 



External Characters. — Body rather dark in colour anteriorly ; tapering conically at 

 posterior extremity. Sucker cylindrical, well marked. Head trimcate, having a circlet 



