884 MB, F. 6. PARSONS OK THE [Xov. 29, 



In Dibits the uterus resembles that of Pedetes, the Fallopian 

 tubes are very short, and the cervix uteri has two ora on its 

 dorsal aspect. The urethra is very long, so that the bladder is an 

 abdominal organ ; it opens, however, just beneath the clitoris, at 

 the vulval orifice. 



Vascular System. 



The Heart shows nothing to attract special attention in the 

 ventricles. There is no moderator band in tbe right. The right 

 auricle shows a well-marked, nearly vertical ridge on the posterior 

 wall(D, fig. 12), lying between the posterior (E) and left anterior (C) 

 caval orifices. It is described by Marshall in the Eabbit as the 

 Eustachian valve (' Practical Zoology,' p. 333), but it is on the 

 wrong side of the postcaval opening to correspond with that 

 structure in man. Its position seems to me to correspond most 

 closely with that of the septum spurium of His. The foramen 

 ovale (B) is patent, and opens into the left auricle by a valvular 

 slit-like opening, exactly as it does when it is patent in man. 

 Two pulmonary veins open into the left auricle on each side. 



Heart of Pedetes with right auricle opened from in front. 



A. Right anterior vena cava. ] D. Eidge. 



B. Foramen ovale. I E. Posterior vena cava. 



0. Left anterior vena cava. j F. Appendage with muscuU pectinati. 



The branches of the arch of the aorta are, as in man, innominate, 

 left carotid, and left subclavian. 



In the foetal specimen the foramen ovale is large, the Eustachian 

 valve is attached to the ventral side of the postcaval orifice. 

 The ridge which has been described in the adult heart is distinct 

 from the Eustachian vaUe, :ind is best marked on the ventral 



