ON THE ANGUILLULID^. 159 



especially in ventral region before and behind anus, where there is a linear series. Am(s 

 yy" from posterior extremity. Spicules very long and narrow, but slightly rounded and 

 enlarged at points, length y^" ; accessory piece none. 

 Sab. Small green sea-weeds from tide-pools, Falmouth. 



2. C. PROFUNDI, n. sp. (Plate XIII. figs. 198-200.) 



Female, length ^", breadth sto "• 



External Characters. — Body light- coloured, slender, tapering gradually forwards, but 

 more notably towards posterior extremity, which is rather long and filiform, having two 

 small setae at its termination. Head truncate, furnished with a circlet of six stout and 

 long, spreading setae. Integument having longitudinal markings, transverse not visible ; 

 two circular (?) depressions, one on each side of head, and about 3 3^3 3" in diameter. 



Pharyngeal cavity very small, almost wanting. (Esophagus about -^th of total length, 

 gradually widening towards termination. Intestine covered with pale-coloured hepatic 

 particles, having a tessellate arrangement. Anus yoo' froiii posterior extremity. Vuli-a 

 about the middle of body. Uterine segments rather short. Excretory duct opening 

 opposite middle of oesophagus. 



Male, length ^", breadth ^tz"- 



Anus Y5o" from posterior extremity. Spicules very long, slightly curved, lengthy^" ^ 

 apparently not tubular, but grooved from angular bending. Accessory piece small, 

 indistinct. 



Hab. In mud dredged up from a depth of 20 fathoms, Falmouth Harbour. 



26. SPIRA \ Bastian. 

 Gen. Char. Body tapering at extremities. Caudal sucker very smaU and indistinct ; 

 sucker-tubes absent. Integimient having transverse striae ; two small, lateral, cir- 

 cular, convex prominences or depressions of integument in cervical region; seta? 

 not abundant, principally cephalic ; cephalic papillae wanting. Pharyngeal cavity 

 wanting. CEsoj^hagus short, distinctly muscular, with a simple terminal swelling. 

 Intestine moderately well covered with rather large, light-coloured hepatic particles. 

 'Fiilva at middle of body. Uterus bifid ; segments symmetrical. Spicules curved, 

 moderately broad, enlarged at upper extremities. Accessory pieces two, nearly 



straight. Ocelli none. Excretory ventral gland .... Lateral canals 



Movements active. 



1. S. PARASITIFERA, n. sp. (Plate XIII. figs. 201-203.) 



Female, length yj", breadth 33-3". 



External Characters.— ^oAj opaque white, tapering anteriorly and also gradually to a 

 point posteriorly. Head rounded, provided with a circlet of 4-6 short setaj. Integu- 

 ment with faint transverse stri^ 20000" apai't ; small lateral hemispherical prominences 

 close to anterior extremity. 



(Esophagus about ^ih. of total length; terminal swelling nearly globular. Intestine 



' areipa, a coil, from tbe frequency with which they twist their bodies into this form. 



