ARREST OF DEVELOPMENT. 77 



319. A Human female foetus with shortening of all four extre- 



mities. There is a considerable abnormal deposit of sub- 

 cutaneous fat. The child was still-born at the eighth 

 month of pregnancy. 



Presented by William Lyon, Esq., 1825. 



320. A female Human foetus with arrest of growth in the pelvic 



girdle and all four extremities. The left inferior ex- 

 tremity has been dissected. The muscles of the toes 

 and the gastrocnemius arise from the femur immediately 

 below the insertion of the psoas and glutens maximus. 

 A constriction may be seen around the right thumb, which 

 is obviously in the first stage of so-called intra-uterine 

 amputation. Presented by Sir S. Hammick. 



321. The skeleton of a full-time hydrocephalic foetus, with ex- 



treme shortening of the limbs. All the bones are well 

 ossified except the sternum ; its cartilaginous condition is 

 an indication of arrested development. The shrivelling 

 of the cartilaginous epiphyses has much increased the 

 deformity of this preparation. 



Presented by R. Liston, Esq. 



322. The skeleton of a similar foetus with the great arteries 



injected and preserved. The urinary bladder is also 

 attached to the pelvis. 



Class V. AREEST OF DEVELOPMENT. 



Arrest of development is occasionally uncomplicated, as in 

 aschistodactylus, or webbing of the digits. It is more commonly 

 accompanied by atrophy, which is sometimes so complete that 

 no trace of the part remains . S o-called intra-uterine amputations 

 apparently always arise from atrophy. Sometimes a single bone 

 is undeveloped, probably from early arrest and atrophy. 



A. Of the Digits, 

 a. Aschistodactylus, Gurlt. 

 Syn. Syndactylus, Geoff. 



323. The skeleton of the manus of a Pig, with the second pha- 

 langes of the functional digits adherent, and their third 



