398 



SHELLS. 



[Chap. XI. 



part thereof, so longe as they feele them creepe ; and 

 when they hold still, letting it rest in that sort till the 

 next daye, they bind it fast and annoynt the hole, and 

 the swelling from whence it commeth foorth, with fresh 

 butter, and so in ten or twelve dayes, they winde them 

 out without any let, in the meanetime they must sit still 

 with their legges, for if it should breake, they should not 

 without great paine get it out of their legge, as I have 

 seen some men doe.' 9 1 



The worm is of a whitish colour, sometimes inclining 

 to brown. Its thickness is from a half to two-thirds of 

 a line, and its length has sometimes reached to ten or 

 twelve feet. Small specimens have been found beneath 

 the tunica conjunctiva of the eye ; and one species of the 

 same genus of Nematoidea infests the cavity of the eye 

 itself. 2 



Planaria. — In the journal already mentioned, Dr. Ke- 

 laart has given descriptions of fifteen species of planaria, 

 and four of a new genus, instituted by him for the 

 reception of those differing from the normal kinds by 

 some peculiarities which they exhibit in common. At 

 Point Pedro, Mr. Edgar Layard met with one on the 

 bark of trees, after heavy rain, which would appear to 

 belong to the subgenus geoplana. 3 



Acalephce. — Acalephse 4 are plentiful, so much so, 

 indeed, that they occasionally tempt the larger cetacea 

 into the Ghilf of Manaar. In the calmer months of the 

 year, when the sea is glassy, and for hours together 



1 John Htjighen Van Lin- of a light brown above, white un- 

 schoten his Discours of Voyages derneath ; very broad and thin, 

 into the Easte and West Indies, and has a peculiarly shaped tail, 

 London, 1599, p. 16. half-moon-shaped in fact, like a 



2 Owen's Lectures on the Inver- grocer's cheese knife." 

 tebrata, p. 96. 4 Jelly-fish. 



3 "A curious species, which is 



