PARASITES FOUND IN ECHINUS ESCDLENTUS, L. 281 



On some Parasites found in E chin vis 

 esculentus, L. 



By 



Artliur E. Shipley, M.A., 



Tellow and Tutor of Clirisl's Colle£^e, Cambridge, and Lecturer in tlie 

 Advanced Morphology of the Invertebrata in the University. 



With Plate 18. 



I. TURBELLARIA. 



The interesting- parasite, Syndesnins, was first observed 

 by Patrick Geddes,^ wlio, liowever, beyond drawing attention 

 to its partly Tnrbellarian, partly Trematode characters, made 

 no attempt to describe it. He found it in tlie perivisceral 

 cavity of Echinus esculentus, L. 



W. A. Silliman^ in the following year gave a description 

 of the external features of the parasite, and suggested the 

 generic name Syndesmus. He found it living on a large 

 green nematode, which seemed to him to be a parasite of E. 

 esculentus taken at Roscoff. 



Five years later Ph. Fran9ois"' in the same Proceedings 

 records the occurrence of this animal in the intestine of 

 Strongylocentrotus lividus, Lam., and of E. acutus. 

 Lam., at Banynls. His description, however, differs mate- 

 rially from that of Silliman, — so much so, indeed, that Braun^ 



1 ' Arch. Zool.,' exp. 1, ser. viii, 1879-80, p. 483. 

 - 'C. II. Ac. Sci.,' xciii, 1881, p. 1087- 



3 Ibid., eiii, 1886, p. 752. 



4 'Central. Bakter.,' v, 1S89, p. 41. 



