ON THE ANGUILLULID.^. 155 



posteriorly than anteriorly. Head truncated or obtusely rounded, surrounded by setae, 

 some directed forwards and others spreading, the latter continuing for some distance 

 over anterior part of body. Integument very thin ; no markings visible. 



JPharyngeal cavity cup-shaped, a-oW deep. (Esophagus -^^ of total length. Intes- 

 tine well covered with cells presenting a tessellate arrangement, and containing light- 

 coloured granules. Vulva slightly anterior to middle of body ; seven minute suctorial 

 eminences in median line before and behind it, about TcHro" apart. Anal glands con- 

 sisting of four distinct masses. Excretory duct opening near middle of esophagus. 

 Laterq,l canals faintly granular, occupying about ^ih of circumference of body. 



Male, not seen. 



Sab. In sand at roots of sea-weed from tide-pools, Palmouth. 



2. L. ELONGATUS, n. sp. (Plate XII. figs. 180, 181.) 



Hale, length -^", breadth 5-3-3". 



External Characters. — Body very long and filiform, not tapering at all anteriorly,, 

 and but very slightly immediately before termination. Head bluntly rounded, furnished 

 with a circle of eight setae, directed forwards. Integument thin, presenting longitudinal 

 markings t"2 oo^" apart. 



Pharyngeal cavity nearly rectangular, depth xifoo "> having three thin horny laminae 

 continued backwards (into substance of 03sophagus), with rounded and minutely serrated 

 edges. (Eso^jhagus about ^th of total length. Intestine covered with cells having a 

 tessellate arraugement ; individual cells containing rather few granules. Anus -^"' 

 from posterior extremity. Spicules of moderate length, curved ; accessory p)ieces thin, 

 flat, blade-like. Anal glands four large, somewhat quadrate, granular bodies, lying 

 between anal cleft and sucker-tubes. Excretory duct opening near middle of cesophagus. 



Female, not seen. 



Hab. With Symplocostoma tenuicollis and Chromadora vulgaris on fine filamentous 

 green weed from tide-pools, Falmouth. 



22. TACHYHODITES ', Bastian. 



Gen. Char. Body tapering at extremities. Caudal sucker very small ; no sucker-tubes 

 visible. Integument having transverse striae ; cephalic setae present ; j^apillae absent. 

 Pharyngeal cavity very small, indistinct. (Esophagus almost cylindrical. Intestine 

 rather sparingly covered with light olive-coloiired hepatic granules. Vulva poste- 

 rior to centre of body. Uterus unsymmetrical. Spicules rather narrow, curved. 

 Accessory pieces nearly straight, pointed, and directed backwards. Ocelli (?) 

 two bright colourless bodies on upper sui-face of cesophagus. Excretory ventral 



gland lateral canals 



Movements very rapid. 



1. T. NATANS, n. sp. (Plate XIII. figs. 182-184.) 

 Female, length -g^", breadth e^". 

 External Characters. — Body tapering towards either extremity, but princi2)ally towards 



' Ta)^vs, swift, aud oSirris, a traveller. 



x2 



