PARASITES FOUND IN ECHINUS ESCULENTUS, L. 289 



tion. Unfortunately I did not undertake this at once, ;ind 

 "vvlien I came to look at the specimens a short time ago I 

 found thatj owing to a piece of iron being in the bottle in 

 which they were preserved^ the nematodes had become coated 

 with rustj and in freeing it from rust their structure Avas so 

 injured that nothing of their histology could be made out. 

 The larger worm had further been injured in extracting it 

 from the shell of the host. 



Beyond the facts that the longest nematode is some 46 cm. 

 ii] length, a little under 1 ram. in average diameter, and the 

 smaller specimens were some 6 cm. in length ; that both ends 

 of the animals taper, but more particnlarlj^ the anterior; that 

 the postei'ior end is recurved, as is so usual amongst male 

 nematodes; nud that the alimentary canal was visible thi'ough 

 the skin in the line specimens as an opaque strand, I can say 

 nothing. Enough is not known to warrant the suggestion of 

 any specific chai-acters, and I mention the parasite only in the 

 hope that it may attract attention to it and lead to its being 

 found again, carefully preserved, and investigated. 



Zoological Labokaxohy, Cambridge ; 

 April, 1900. 



EXPLANATION OF PLATE 18, 



Illustrating Mr. Arthur E. Shipley's paper " On some 

 Parasites found in Echinus esculent us, L." 



List of Abbreviations. 



c. Cuticle. c.(j. Cciebicil ganglion. eg{/. Egg in uterus, ep. Epidermis. 

 g.d. Genital duct. g.p. Genital pore. hi/p. Amoeboid plasmodium lining 

 intestine, i. Intestine, m. Mouth, ov. Ovary, par. Parenclivma. sc. 

 Sucker, s.gl. Salivary gland, sh.gl. Shell-gland. /. Testis, v. Vagina. 

 v.d. Vas deferens, y.g. Yolk-gland. 



Fig. 1. — A longitudinal horizontal section through Syndcsnius eclii- 

 norum near the ventral surface. 



VOL. 44, PAltT 2. — NEW SEKIKS. T 



