Entozoa of British Marine Fishes. 89 



The diiuneter of tin* oral sucker was "21-2(5 mm., that of 

 the ventral sucker '2H-''M) mm., the proportion therefore 

 hcinir ^> : ", which is i.h-ntjial with tliat round by Lander and 

 Odhncr. 'I'lic genital aperture lies midway between the 

 suckers: Lander says nearer the oral sucker, Odhner nearer 

 the ventral. The appendix always appears in two parts and 

 the intestinal diverticula reach to nearly its e.\treme end. 

 It is deeply striated. 



The pharynx is contiguous with the oral sucker. Between 

 the observations of the above observers there is some diver- 

 gence, Odlmcr's dimensions being much less than those of 

 Lander, I have found it to vary, the breadth as often as 

 not exceeding the length. Length ■0'J-"12 mm., diameter 

 •09-*ll mm. These figures agree more with Lander's, In 

 my specimen the left testis is further forward than the right, 

 which disagrees with both Odhner and Lander's figures. The 

 ovary is gl(jl)u!ar or ovoid and smaller than the testes. The 

 yolk-glands are usually compact, but sometimes they are 

 more or less scattered, a part being occasionally found at 

 some distance from the main mass and connected with it by 

 a narrower portion. In one ease single follicles were ob- 

 served scattered tln-oughout the body near the appendix. 

 The ova measure •0.'21-"()23 mm. X 'OIS-OIG mm. ; they are 

 thus somewhat broader than those measured by Odhner. 



Subfamily Lecithochieiin^, Liihe, 

 Genus Lecithaster, Liihe. 



Lecithaster gibbosus, Rvid. \_-=L. molllssimus, Levinsen] . 



From a sand-eel {Ammodytes tobianus) I obtained what I 

 believe to be a specimen of this parasite. It occurred only 

 once, although more than fifty sand-eels were examined, so 

 that it is extremely rare. It was, unfortunately, damaged 

 during inspection, but not before I had o])served the following 

 particulars : — 



A large vesicula seminalis lay at the level of the ventral 

 sucker and dorsal to it. A ductus ejaculatorius, with pro- 

 static cells, stretched forward to open a little way behind the 

 oral sucker. In the posterior part of the body the yolk- 

 glands were arranged iu seven or eight lobes radiating from 

 a common centre. There was a small caudal appendix. Iu 

 the position of the testes were situated two circular bodies, 

 displaying internally a system of concentric rings. For this 

 appearance I am unable to account. The ovary could not be 



