548 ME. JAMES JOHIirSTONE OlST THE 



through the neck to the left of the middle line, in order of numbers 

 placed in the angle formed by head and breast. In i. the cord 

 of cells (c.c.) can be seen running between the sternomastoid 

 muscle {m.sm.) and the submaxillary gland (sin.), and pro- 

 ceeding from the cervical lobe of the thymus (tm.c.) ; a section is 

 omitted between i. and ii., in which last it can be seen to pass 

 underneath the omohyoid muscle (m.oh.). In iii. the lateral 

 lobe of the thyroid (th.") appears, and the posterior part of the 

 cord of cells passes out of the plane of the section. Then omitting 

 another section, in iv. it curves round the dorsal and posterior 

 surface of the submaxillary gland (sm.) ; and in v. (two sections 

 omitted) it can be seen approaching the lateral lobe of the thyroid 

 (th."). Pinally in vi., after omitting four sections in which the 

 proximity to the thyroid becomes greater, it joins a little 

 ventral descending process of the latter. 



Hence we have the somewhat remarkable arrangement in at 

 least this Macropus of a cord of cells connecting the cervical 

 portion of the thymus with the lateral lobe of the thyroid 

 of the corresponding side. I have seen this cervical thymus 

 both in Macropus Wilcoxii and in Mr. Woodward's sections, but 

 neither showed the connecting strand of cells. In the former, 

 however, the cervical thymus, whicb was rather small, lay near 

 to the lateral lobe of the thyroid. But in tbis case the distinc- 

 tion between paired lateral and median uupaired lobes of the 

 thyroid did not exist, the latter consisting only of two lateral 

 portions joined together by an attenuated bridge of thyroid 

 tissue. 



YI. NOTORTCTES TYPHLOPS. 



Through the kindness of Prof. Howes I have had the oppor- 

 tunity of examining a specimen of this curious marsupial. At the 

 time when I examined it I was not thinking of a detached 

 superficial cervical thymus, but my notes and drawings give no 

 indication of such an organ being present. The thoracic portion 

 of the organ is of the characteristic type, and presents no 

 special features. It lay below the large first rib, and extended 

 down to nearly the third. To naked-eye examination it gave a 

 perfectly normal appearance, although it was closely adherent 

 to the surface of the pericardium, and very thin and flattened 

 out. On microscopic examination it showed only a few separate 



