, ORCELLA. 403 



connective tissue, most delicate in nature, and with elongate and sub-circular nucleated 

 corpuscular bodies distributed in profusion throughout it. Here and there, long linear 

 rows of the fusiform cells appear, and predominate in encircKng lines round the larger 

 sized blood-vessels, being well marked where these are seen cut transversely. The 

 opposite free allantoic surface of the chorion has a thin covering of large pavement 

 or tessellated epithelium, each cell of which sits loosely to its neighbour, and 

 all are abundantly granulated, or filled with refringent particles, simulating oil 

 granules. 



Umbilical cord. — This is about 13 inches long, and describes a series of curves. 

 Besides the peduncular corpuscles which occur near its funis, the cord throughout 

 its extent is studded over, both in the intervals between the vessels and on the latter 

 themselves, with small glandular-like bodies which are covered by the investing 

 membrane of the cord. These are of two kinds ; one, elongated ovoid bodies, half 

 white and half dark, or with almost black centres, and in this respect, as in their form 

 and general characters, they resemble the pedunculated bodies of the amnion. The 

 other bodies are much more numerous, and are either yellow globular masses or they 

 consist of a number of such masses aggregated together. The yellow bodies are 

 well-defined sacs (Plate XXXIV, fig. 8, ?/), with thick walls which do not collapse 

 when cut across and are most numerous in the loose areas betwixt the vessels. 



liympliatics of cord. — Lying between the point of division of the umbilical 

 vessels and the two veins there exists an oval, red, glandular body (Plate XXXIV, 

 fig. 9 gl), almost a quarter of an inch in diameter. A fine reddish, wavy, moniliform 

 tube (fig. 9, in) enters this structure and leaves it at the opposite end. This red body 

 is a sac filled with a grumous substance, which under the microscope consists of a 

 multitude of very minute, variously sized round cells. These cells exhibit a black 

 speck-like nucleus or centre, and along with them are larger cells and a mass of 

 granules. The walls of the sac internally have a velvety appearance, from the fact 

 that they are covered over by a multitude of fine villous processes. Situated 0"'75 

 below the red glandular body, and lying over the left umbilical veiu at the point 

 where it reaches the chorion, a small sac occurs, 0""35 long. Its waUs are very 

 delicate, colourless, and transparent, and the upper haK of its extent is divided ofi: 

 from the rest of the cavity by a very delicate septum, which has a slit in. its centre, 

 but I cannot be decided as to this, because it is possible I may have ruptured the 

 septum in passing a needle into the larger cavity, before I became aware of the 

 existence of the septum. The presence of the septum is externally indicated by a 

 slight constriction of the sac, and the foetal end of the secondary cavity rapidly 

 contracts and is prolonged upwards to the red glandular body as a fine tube, which 

 is with diflBiculty distinguished, as it has the same colour as the general substance of 

 the cord (fig. 9, Ih). Another vessel of the same character passes out from the 

 opposite end of the primary canal of the sac, but I failed to trace it to its end. 

 A pedunculated structure (fig. 9, p), also evidently glandular, is closely associated 

 with the glandular body just described. In near proximity to it is another 

 moniUform tube the course of wliich I was not able to trace satisfactorily, but 



