354 



DISCOVERY REPORTS 



the basicranial and thoracic retia described above. The plexus takes the form of a 

 diffuse vascular mass situated on either side of the bulbus penis in the male (Fig. 10) 

 or of the vagina in the female. It lies between the bulbus or vagina and the posterior 



Fig. io. The genital region of a foetus 177 metres in length showing the three arcades formed by the 

 attachments of the rectus abdominis muscle and the vessels concerned in the formation of the inguinal 

 plexus. 



a, Epigastric artery 



b, Iliac artery 



c, Inguinal lymphatic glands 



d, Caudal attachment of the rectus abdominis muscle 



e, Iliac attachment of the rectus abdominis muscle 

 /, Superficial attachment of the rectus abdominis muscle 



g, Pelvic rudiment 

 h, Ischio-cavernosus muscle 

 (, Retractor penis muscle 

 j, Ischio-caudalis muscle 

 k, Levator ani muscle 



insertions of the rectus abdominis muscle. It is intimately related to the two very 

 large lymph glands which are situated in this position and are presumably the homo- 

 logues of the inguinal lymph glands of other mammals.- On each side of the body one 

 of these lymph glands (Fig. 10) lies against the prostatic portion of the urino-genital 



