Harris Hawthorne Wilder 403 



sensation along the median line. When the head is single there is but a 

 single personality. 



a. Components separate above and united in the pelvic region, hut with a 

 Single perfect leg each, the outer in each case, while the two inner legs are 

 represented by a double median appendage which is bilateral, and may be 

 xvell developed or rudimentary. 



These monsters and those included under (&) and (c), although existing 

 mainly in the form of fetuses in museums, form the necessary connecting 

 links between the last group and the type represented by the Tocci brothers. 

 In these the inner arms or legs (or in rare cases both) are represented 

 by double members which consist so plainly of two symmetrically placed 

 components united together that one is strongly tempted to consider it 

 a fusion of two originally independent limb components. Instead of this, 

 in accordance with the theory supported by this paper, such double limbs 

 must be looked upon rather as parts, the anlagen of which wsre incompletely 

 separated, and were thus not allowed to develop independently of one another. 



This and other similar points will be taken up more fully later on, when 

 a resume is made of all double forms with attem.pts at their explanation. 



Type: Fisher's case 43 (quoted from Walter, Observationes anatomicas, 

 Berlin, 1775). This monster was one of twins born to Anna Maria Woblack, 

 near Berlin, November 17, 1773, all of the male sex. One of these was a 

 normal, healthy child, .the other the double monster in question. " The pla- 

 centa was a single mass, to the opposite sides of which two cords were 

 attached, one for the single, the other for the double fetus; the cord of the 

 latter was three yards long. The normal and abnormal fetuses were both 

 enveloped in a single sind common chorion." 



As for the double monster, the type of this subdivision, Fisher states that 

 "the vertebral columns are complete in both (components). Between the 

 two sacra there was found a shovel-shaped osseous mass, consisting of rudi- 

 mentary fused iliac bones, from the lower part of which hung a median lower 

 extremity, which was attached by ligaments. This compound posterior pelvic 

 extremity contained a femur; a tibia, which was thick and bent at an angle; 

 the usual tarsal bones; seven metatarsals, six of which formed a row; the 

 seventh and largest supported two toes which were webbed." 



Other cases: 

 1. Marie-Rosa Drouin. New-born female infant from Montreal, described 

 by MacCallum in 1S78. 



The two complete upper components formed a right angle with the common 

 trunk "which commenced at the lower part of the thorax of each." There 

 was a rudimentary buttock between the two lateral ones, from which pro- 

 jected " a rudimentary limb with a very movable attachment. This limb, 

 which measures five inches in length, and is provided with a joint, tapers to 

 a fine point which is furnished with a distinct nail. It is very sensitive and 

 contracts strongly when slightly irritated." 



This case, with the rudimentary posterior limb, shows close similarity both 

 to the type above (Fisher's case 43) and to those of (cZ) below, since, with 

 the exception of this small median rudiment, the case is identical, save in 

 sex, with that of the Tocci, including the median buttock, while on the 

 other hand, it differs from the type of this subdivision merely in the lesser 

 development of the median leg. 



