BRITISH MARINE TURBELLARIA. 507 



The male genital pore lies close behind the mouth, the 

 female aperture halfway between the anterior end and the 

 subcentral sucker. The vesicula seminalis is very large. 

 The uterus is a large lobed sac surrounding the main gut; 

 the uterine glands are numerous (10 — 11 on each side). 

 Surrounding the female pore is the very large radiate '^shell- 

 gland." 



Habitat. — On compound Ascidians and the sponge Hyme- 

 niacidon sanguiuea, 5 — 15 fms., Plymouth (W. Garstang, 

 F. W. G.) ; Port Erin, Isle of Man, 18 fms. (R. C. Chad wick). 

 Var. 1 ae V i g a t u s between tide-marks, Port Erin, and neighbour- 

 hood (W. J. Beaumont, F. W. G.). 



Distribution. — Naples (Lang). 



This variable species may be easily mistaken for Stylosto- 

 mum variabile. It is, however^ recognisable by the presence 

 of a continuous median gut-branch over the pharynx, whereas 

 in Stylostomum the pharyngeal region appears as an unin- 

 terrupted white area, bordered laterally by the gut-diverticula. 



Genus 32.— Eurylepta, Ehrenberg, 1831 (10). 

 Body smooth. Tentacles long, tapering. Usually 

 five pairs of secondary gut-diverticula. The 

 intestine is brightly coloured. Male genital pore 

 beneath the hinder end of the pharyngeal sheath. 

 One pair of uterine glands is present. Cephalic 

 group of eyes extending posteriorly far beyond 

 the brain. 



68. Eurylepta cornuta (O. F. Miiller). 



1776. Plan ARIA coenuta, 0. F. Miiller (3). 



1831. Eurylepta cornuta, Ehrenberg (10). 



1832. Planaria cornuta, Johnston (11). 

 1845. „ „ Thompson (19). 

 1845. „ „ Johnston (20). 

 1853. „ „ Dalyell (29). 

 1865. Eurylepta cornuta, Johnston (38). 



1865. „ Dalyelli, Johnston (38). 



1866. „ CORNUTA, Ray Lankester (39). 



