THYMUS IN THE MAKSUPTALS, 



547 



these cell-strings could be traced into actual contiguity with the 

 substance of that, but there was no conflueuce of tissue. 



At the distal extremity (considered with respect to its origin 

 from the cervical thymus) this cell- tract ran along the inferior 

 and lateral aspect of the submaxillary gland (s.m.). Here the 

 sternomastoid muscle (m.sm.) passed externally and dorsally to 

 it, and the cord pat-sed between salivary gland and muscle. The 

 omohyoid (m.oh.) appeared in the same sections, and the cell- 

 strand passed beneath this muscle and could be traced curving 

 upwards round the dorsal border of the submaxillary gland, 

 running externally at the same time with respect to the median 

 line of the body. 



The disposition of this curious structure may be best realized 

 by the aid of the following consecutive series of somewhat dia- 

 grammatic sketches of the region in question. 



^ig !• — Macropus Eugenii, pouch-specimen. Series of sections representing 

 the passage of the cord of cells extending between the cervical thymus 

 and the lateral lobe of the thyroid. (References, see text.) 



The sketches represent a series of longitudiual sections taken 



