ARREST OF DEVELOPMENT. 79 



328. A foetal Pig, in which the development of the posterior 



limbs and pelvic girdle has been considerably arrested. 

 The femora are deficient from atrophy, so that the limbs 

 are only attached to the trunk by skin and ligamentous 

 tissue. The abdomen has been opened below to show 

 the extremely diminutive condition of the pelvis and 

 pelvic viscera. The hind legs terminate in blunt points, 

 and each has a very imperfect hoof. Hunterian. 



329. A foetal Puppy, in which the development of all four limbs 



has been arrested. The specimen has been much altered 

 by having been dried previously to being placed in spirit, 

 but is of extreme interest, as it exhibits a very rare con- 

 dition, a patagium extending from the flank to the elbow 

 on either side. Mus. Brit. 



330. The skeleton of a Human foetus, at about the sixth month 



of gestation, with the radii and thumbs wanting. The 

 head is slightly hydrocephalic. All the bones are ab- 

 normally slender, especially the clavicles, which are con- 

 siderably bent. The ossification of the sternum is very 

 irregular and imperfect, as is also that of the pubic sym- 

 physis. Presented by Erasmus Wilson, Esq., 1869. 



331. The skeleton of a Human seven-months' foetus, with total 



deficiency of the right arm. The scapula and clavicle 

 are, however, present. The left arm is represented by a 

 cartilaginous humerus, a slender ulnar, and a single digit, 

 which consists of a metacarpal bone and three phalanges 



XT I: o 



united by cartilage and ligament. 



Presented by Sir W. Blizard, 1811. 



332. A Human male foetus, 7 inches in length, about the fifth 



month of gestation, with the left arm arrested and atro- 

 phied. The arm consists entirely of soft tissues, and has 

 a three-lobed extremity ; one of the lobes terminates in 

 a slender thread-like process. The remains of the limb 

 are attached to the glenoid cavity by connective tissue. 

 The great pectoral muscle ends in the connective tissue 

 of the limb. A portion of the integument has been re- 

 moved to show the conditions described above. 



Mus. Brookes. 



