PROCEEDINGS 
OF THE 
(CainbnDqf |;)|jHosopbrcal Soiktji. 
A critical description of three cases of Single Hypogastric 
artery in the Human Foetus. By W. L. H. Duckworth, M.A., 
M.D., Sc.D., Jesus College. [Plates XII. and XIII.] 
\Read 11 November 1907.] 
The teratological specimens which have provided material for 
the following observations are human monstrosities in the Anthro- 
pological Laboratory at the Anatomy School. In each instance 
the hinder end of the trunk and the lower limbs are affected 
and malformed. The disturbance is greatest in the specimen 
designated F, which is a sytnelian or sirenian monster. Of the 
two remaining specimens, A and E, the latter (E) approaches the 
sirenian type, while in A the principal local defect noticed on 
superficial inspection is club-foot or talipes varus. All three 
specimens agree in the possession of a single artery (accompanying 
the umbilical vein) instead of the two arteries normally present. 
The present account consists of an investigation of the conditions 
associated with this anomaly, and some comments upon the results 
of the investigation are appended. The three specimens will be 
considered in alphabetical order. 
I. Specimen A. The general anatomy of this monster has 
been described in Schwalbe’s Zeitsclirift fur Morphologie und 
Anthropologie (Band x, Heft 3, 1907), so that it is unnecessary to 
enter into much detail in the present connexion. The sex is male, 
and when first received the specimen measured 290 mm. from 
vertex to coccyx, and weighed 2073 gm. It is therefore to be 
regarded as a foetus of the ninth month. 
The single umbilical artery in A (Figs. 1 and 2) appears to be 
the main continuation of the left common iliac vessel. It is 
particularly remarkable that the internal iliac artery on this 
