402 FCETAL DY ST OKI A. 



distinct individuals, very unequal in development, the smallest being 

 the most imperfect ; testifying that it, Hke a parasite, has lived at the 

 expense of the other. It would appear that the triple monstrosities 

 have not been met with in sufficiently large number to establish a 

 trustworthy classification. 



Each of the orders of Saint-Hilaire, like those of Gurlt, contains 

 several families, subdivided again into genera and species, according 



Fig. 104. 



EcTROMELiAN MONSTROSITY (Saint-Hilaiee) ; Nanomclus Campylochirus (Gurlt;i : 



Horse. 



to their affinities, and which include all the monstrosities he had met 

 with. With regard to these families, it may be mentioned that among 

 the single autositic monstrosities, there are the ectromelians {ixTpdm, 

 to make abort, yueAos, limb), in which we have a more or less complete 

 deficiency in the development of the limbs, either anteriorly or 

 posteriorly, and involving one or more of these (Figs. 104, 105). 



Fig. 105. 



EcTROMELiAN M0NSTRO8ITY (Saint-Hilaire) ; Xanomelus Ccunpylochirus (Gurlt) 



Goat. 



The Symclian Monstrosities (o-vu, with, /xeAo§, limb) are those which 

 Gurlt includes in his first Class and Order, there being an absence of 

 parts, with fusion of others (Fig. 106). 



The Cclosomian Monstrosities (x^/A?/, hernia, i7i7)jia,bocly), more frequent, 

 perhaps, than any others, are those which Gurlt places in his third 

 Order — Schistocorvms, and are chiefly characterized by the absence, 

 more or less complete, of the abdominal parietes, and the abrupt 



