92 VERMES. 



This animal always ascends the side of its vessel, where it uniformly 

 establishes itself in a horizontal silken tube, close to the surface of the 

 water. 



It is rare, and it survives readily. Marine. 



PLATE X. 



FIG. 25. Vermiculus variegatus. 

 26. Specimen enlarged. 



Note. The authors of observations on the Vermes have devoted 

 themselves greatly to the Entozoa, whereof, very few being offered to me, 

 I cannot say anything interesting of their nature. But there is one, the 

 Ascaris, which, if I mistake not, has been always considered intestinal, 

 which occurs frequently in very different situations, as well ' as in the 

 places ascribed to it. 



1. ASCARIS FLUSTR^:. Plate X. fig. 27. 



Length, half a line ; body slender, nearly cylindrical ; extremities 

 acute. Colour, dark grey or brownish, with a darker line in the centre 

 of the anterior extremity, denoting an internal organ. Extremities pel- 

 lucid. Two very conspicuous black specks, resembling eyes, are seated 

 just at the origin of the anterior pellucid part. 



Some of these animals appeared among a number of the decaying 

 corpuscula from the Flustra carbacea, which they frequently penetrated, 

 as if in quest of food. 



It may be questioned, perhaps, whether this is truly one of the 

 Ascarides. 



PLATE X. 



FIG. 27. Ascaris flustrce, magnified. 



