114-8 I'llOV. J. p. HiLL AND MR. R. H. BURNE ON THEl 



subject of Hubrecht's brief reference and figure (10, p. 115 &, 

 fig. 151). 



■ For comparison with our preparations of CJiiromys, we have 

 had available some sections of the placenta of JVycticebus from 

 the collection of the late Dr. R. Assheton, kindly placed at 

 the disposal of one of us by Mrs. Assheton, and also preparations 

 made from the imbedded material of Lepileimor, wliich formed the 

 subject of the contribution of the late t)r. J. W. Jenkinson (16), 

 for the use of which we are much indebted to Prof. E. S. Goodrich, 

 F.R.S. 



Uterus. 



The uterus (specimen A, PI. I. fig. 1) is much dilated, and forms 

 a pear-shaped mass about the size and figure of a small clenched 

 fist, continuous with the vagina posteriorly by a short narrow 

 cervical segment. Its convex anterior end projects forward 

 further on the left than on the right, and is indented to the 

 right of the mid -line by a shallow vertical furrow, vs^hich mai'ks 

 the division between the two unequally dilated horns. Internally 

 this division is emphasised by the projection of a semi-lunar fold 

 (PI. I. fig. 1, Jid.) from the line of the external furrow for some 

 2 or 3 cm. ii:»to the uterine cavity. 



From the side of each horn, a short distance posterior to its 

 fundus, projects a fold of the broad ligament carrying the con- 

 torted Fallopian tube, and by its reflexion forming a deep 

 peritoneal pouch, within which lies the ovary attached by a long- 

 ovarian ligament to the uterus. About 1 cm. ventral to the 

 termination of the Fallopian tube is the commencement of the 

 round ligament whence the ligament passes to the groin in a fold 

 projecting fi'eely from the surface of the broad ligament. 



In specimen B, ov/ing to strong contraction during preser- 

 vation, it is probable that the shape of the uterus is to some 

 extent unnatural. It is transversely extended, being nearly 

 twice as broad (at the level of the Fallopian tubes) as the dis- 

 tance between its cervix and fundus. The left horn is con- 

 siderably more dilated than the right, and forms a rounded 

 bulbous extension of the corpus uteri, with the entry of the 

 Fallopian tube placed some distance behind its anterior margin. 

 The right horn is much smaller with a conical apex to which is 

 a.ttached the Fallopian tube. The union of the two horns is not 

 indicated externally by a furrow as in specimen A, but upon the 

 antero-venti'al sui-face the position of the internal fold that 

 separates them is mai^ked by a slight ridge. 



The uterus (specimen A) when opened along its posterior 

 (dorsal) aspect was found to be completely filled both as regards 

 cornu.a, corpus, and cervix by the foetal membranes (PI. I. fig. 1), 

 the well-marked chorionic appendage occupying the right cornu, 

 and a prolongation of the main sac extending into the cervical 

 canal (PI. I, fig, l,p.). "Within them lay the foetus, far advanced 



