38 ABNORMAL CONDITIONS OF THE AXIS. 



there was no auditory meatus. The normal face and head were not 

 malformed. The brains were distinct, each invested in its own 

 membranes ; the dura mater of each adhered to that of the other 

 at the point of contact. The chief supply of blood to the upper head 

 was by a number of vessels passing from the membranes of one 

 brain to that of the other. The movements of the features of the 

 upper head appear to have been purely reflex, and by no means to 

 have been controlled by the feelings or desires of the child. The 

 movements of the eyes of the accessory head did not correspond 

 with those of the child, and the eyelids were usually open, even 

 during sleep. 



Hunterian. 



b. Ischiopagus. 



A second foetus, or more generally an amorphous tumour of 

 connective tissue containing bones, cartilage, and other remains 

 of a second foetus, adheres to the gluteal region. 



139. A tumour of somewhat conical form, composed of fibrous 

 tissue, fat, and cartilage, which was removed from the 

 nates of a child about 14 months old. A papilla at its 

 extremity appears to represent very obscure indications 

 of a limb. The remains of a portion of intestine, origi- 

 nally blind at each extremity, and about 3 inches long, 

 is seen at its base. It originally contained a fluid re- 

 sembling meconium. The child recovered quickly from 

 the operation. The tumour has been cut through verti- 

 cally to show its structure. 



Presented by T. Blizard, Esq. 



Class III. EXCESS OF GROWTH (GIANTS). 

 [Arranged in the Osteological Series.] 



Class IV. ARREST OF GROWTH (DWARFS). 

 [Arranged in the Osteological Series.] 



Class V.- ARREST OF DEVELOPMENT. 



Subclass I. Cranial arrest. 



Two principal forms of arrest of development occur in the 

 cranial region. Either the lateral arches fail in their develop- 



