A NEW CESTOID ENTOZOON. 403 



rough, flocculent, and adherent to the parenchyma of the liver. 

 The anterior extremity is dilated, and in all the specimens 

 was situate immediately under the peritoneum. The poste- 

 rior extremity, again, was so attenuated that it was traced with 

 great difficulty, as it lay coiled about in all directions through 

 the substance of the organ. Within the outer coat another 

 cyst is situate closely investing the worm ; it is smooth, trans- 

 parent, thin, and elastic, and does not adhere to the outer. 

 The worm is visible through this second tunic, and lies with 

 its anterior bulbous extremity packed up in the vesicular por- 

 tion of the cyst. When one of the animals was released from 

 its prison, and placed in water, it dilated its anterior extremity, 

 and projected its head and neck. The head and neck, 

 when withdrawn, are lodged in the cervical receptacle. There 

 is no particular muscular arrangement to effect this. The 

 tissue of this, as well as of the rest of the animal, was the 

 primitive granular tissue lately described by Mr. Forbes. 

 The four-armed tentacula are retracted by four distinct 

 muscles, all of which consist of granular tissue. The arrange- 

 ment of this part of the animal corresponds exactly with the 

 same part in the Bothriocephalus corollatus as described by 

 Leblond in the Annates des Sciences Naturclles, 1836. The 

 motion of these parts in both animals is similar, and the tissue 

 is identical with that denominated by Leblond " Sarcode," or 

 elementary texture, the granular tissue to which I have 

 already referred. 



The body, when gently compressed between two plates of 

 glass, exhibited transparent transverse articulations at dis- 

 tances of one-third to half-an-inch. The most careful ex- 

 amination, however, revealed no nutritive or generative organs 

 in any of the segments. The dilated cervical receptacle, into 

 which tli" head is retracted, did not appear to communicate 

 witli any arrangement of tubes or cavities in the elongated body. 



The mosl interesting circumstance in tin- history of this 



