A text-book of veterinary obstetrics : including the diseases and accidents incidental to pregnancy, parturition and early age in the domesticated animals . udencephalian Monstrosity. The head of the foetus may prove a cause of protracted or difficultparturition, as we have seen when treating of hydrocephalus as a sourceof dystokia, as well as in other kinds of anomalies when it is eithergreatly deformed or double. We are cognisant of only one instance in MoxsrnosiTiEs. 417 which a pseudenceplialian monstrosity {Perocephalus pseiidocephalns,Gurlt) gave rise to dilliculty iu birth. Double-heade
A text-book of veterinary obstetrics : including the diseases and accidents incidental to pregnancy, parturition and early age in the domesticated animals . udencephalian Monstrosity. The head of the foetus may prove a cause of protracted or difficultparturition, as we have seen when treating of hydrocephalus as a sourceof dystokia, as well as in other kinds of anomalies when it is eithergreatly deformed or double. We are cognisant of only one instance in MoxsrnosiTiEs. 417 which a pseudenceplialian monstrosity {Perocephalus pseiidocephalns,Gurlt) gave rise to dilliculty iu birth. Double-headed (Monosomian and Sysomian) Monstrosities. The occurrence of double-headed monstrosities is more common,perhaps, than any other anomaly ; they are observed more particularlyin Ruminants, though instances are recorded of their appearing in thePig, and even in the Cat species. We have collected reports of some three dozen cases, the large majorityof which refer to this anomaly in the Calf, and not one to the Equine orAsinine species. Only two of these cases appear in English have alreadv shown, in classification of monstrosities, the kind. Fig. : Dicephalus bkollis (Gublt). and degree of division there exists between the heads, and we haveonly now to deal with this anomaly from an obstetrical point of view. It may bo obsened that many of these creatures have been bornalive, and have continued to live for some time. Canu mentions adouble-headed Calf which survived its birth fifty days, and Bert givesa good description of another which he examined when it was fifteenmonths old; but in the latter instance the anomaly was limited to thelower part of the head, the jaws only giving evidence of duplicity. The existence of this anomaly renders birth more or less difiicult, oreven impossible, according to the size of the heads, their point of junc-tion—whether at the face or cranium, or towards tlie neck, and alsoaccording as the presentation of th
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