ON THE ANGUILLULID^. 99 



7. M. AMBiGUA, n. sp. (Plate IX. figs. 14, 15.) 



Male, length ^t", breadth 4^". 



External Characters. — Body narrowing gradually anteriorly, but tapering to a point 

 abruptly behind orifice of genital tube. Sucker small, pointed. Head obtusely rounded, 

 naked. Integument plain, having circiilar depressions on each side of head tooo" ^^ 

 diameter. 



(Esopliagns about ^th of total length. Intestine having a kind of sphincter, with 

 traces of a valvular apparatus at commencement ; otherwise covered with very large cells 

 appearing in two rows, and containing rather light -coloured particles. Amis 0^0" from 

 posterior extremity. Genital tube containing very large and distinct granular cells, 

 opening xooo " above anus. No spicules visible either there or at anal cleft. 



Female, not seen. 



Sab. Marine, in sand from tide-pool, Falmouth. 



2. TRILOBUS', Bastian. 

 Angulllula, Leidy. 



Gen. Char. Body tapering considerably posteriorly. Candal sucker small. Integument 

 plain, or mth longitudinal strife ; setae scarce. 'Pharyngeal cavity rather large, 

 cup-shaped. Teeth none. (Esophagus cylindrical, having three lobes at termina- 

 tion. Intestinal cells having pale-coloured fat-particles, more or less distinctly 

 tessellated. Vulva about middle of body. Uterus bifid, segments symmetrical. 

 Spicules solitary. Males having well-developed ventral suckers. Movements mode- 

 rately active, frequently coiling when touched. 



1. T. GRACILIS, n. sp. (Plate IX. figs. 20-22.) 



Female, length ^", breadth 2^". 



External Characters. — Body pale white, tapering slightly anteriorly, and gradually 

 narrowing to a point posteriorly. Head bluntly rounded, provided with 4-6 stout, short 

 setae. Integument rather thick, but very transparent, with longitudinal striae xoo^o^" 

 apart. 



Fhanjngeal cavity distinct, cup-shaped. QJJsophagus ^th of total length, having three 

 oval lobes at termination, each about 7-fo" long. Intestinal cells containing almost 

 colourless fat-particles, not having distinct tessellation. Anus ror" from posterior ex- 

 tremity. Vulva rather anterior to middle of body ; whole of uterus and ovaries very 

 readily seen. 



Male much smaller than female, length xj", breadth xfe "• Anus yt^" from posterior 

 extremity. Spicules solitary, segments narrow, nearly straight, about -^^" in length. 

 Transverse striae, as well as longitudinal, for some distance above the genital cleft of 

 male; also in mid- ventral region a row of six large sacculi (suckers), in two sets of three, 

 each sacculus about 2-5V0" deep. 



Sab. About the roots of Huppia mariti/ma from brackish water, Palmouth. 



' -pels, three, and Xofliis, a lobe. 



o2 



