96 THE ANATOMY AND DEVELOPEMENT 



the " inserted pedicle" being analogous to the confined Trichina 

 or Gymnorhynchus for we must look upon the inserted pedicle 

 as the active animal. In Csenurus, also, the pedicles are con- 

 tained within the external membrane of the sac. 



I shall finish these observations on the Cystic Entozoa, with 

 the following account by my brother, of Neuronaia Monroii* 



The observations of Pacinif on the peculiar bodies which are 

 appended to the digital nerves, induced me to direct my attention 

 to the " spheroidal bodies," described by the second Monro, as 

 existing on the surfaces of the brain and nerves of the gadida?. 



O D 



I accordingly examined the " spheroidal bodies" in the haddock, 

 and found that they were entozoa, referrible to the family Distom a, 

 and enclosed in cysts. I described these curious parasites at a 

 meeting of the Anatomical and Pathological Society, and a short 

 abstract was published in the monthly Journal of Medical Science. 

 Till lately, I had supposed that I was the first to observe the 

 true nature of these " spheroidal bodies," when Dr. Allen Thom- 

 son ascertained that Dr. Sharpey was in the habit of mentioning 

 them in his courses of lectures in the University College. I ac- 

 cordingly wrote Dr. Sharpey on the subject, and I am indebted to 

 that gentleman for the following interesting account of what has 

 been already recorded regarding this entozoon : 



" When I was in Berlin some years ago, the late Professor 

 Rudolphi remarked to me in conversation, that he thought it not 

 unlikely the little bodies discovered by Dr. Monro 2d, on jhe 

 nerves of the cod, haddock, and other allied fish, would turn out 

 on examination to be entozoa ; and he suggested that I should 

 take an opportunity of inquiring into the point on my return to 

 Scotland. Accordingly, in the autumn of 1836, 1 examined these 

 bodies in the haddock or whiting, I really forget which, but I 

 think it was the former, and found that each of them was a little 

 cyst, containing a Distoma, which could be easily turned out from 



* Monro. " Observations on the Structure and Functions of the Nervous System,'" p. 59. 



t Pacini. " Nuovo Giomale dei Letterate" March and April 1836, page 109. J. Henle 



and Kolliker. " Ueber die Pacinischcn Korperchen an den Xcrven des Menschen nnd der 



