. American practice of surgery ; a complete system of the science and art of surgery . rved andreported in the literature a number of times, as have also cases in which one individual has developed more or lessperfectly while the second is simply anattached parasite, or fcetal caudal end of the body is especiallyapt to be affected, although many differ-ent types have been illustrated in thereported cases. The entire subject isfully dealt with by Ahlfeld, whose Atlascontains illustrations of the majority ofthe authenticated cases on lecord. Inthe classification of the congenital s
. American practice of surgery ; a complete system of the science and art of surgery . rved andreported in the literature a number of times, as have also cases in which one individual has developed more or lessperfectly while the second is simply anattached parasite, or fcetal caudal end of the body is especiallyapt to be affected, although many differ-ent types have been illustrated in thereported cases. The entire subject isfully dealt with by Ahlfeld, whose Atlascontains illustrations of the majority ofthe authenticated cases on lecord. Inthe classification of the congenital sacraltumors, some of those which containrudimentary organs, limbs, maxillarybones, etc., must be considered as truefoetal inclusions. Besides these, thereare tumors which contain only tissuesor organs normally present in the sacro-coccygeal region, which have probably developed from detached islands or restsof embryonic tissue that have gone on to abnonnal growi:h, and are strictlymonogerminal in character. In the well-known case of Geoffrey St. Hilaire, the joined twins Helena and. Fig. 11.—Pelvis of a Case of Joined Twins,similar to that of the Jones Twins (Fig. 10).(Case of Levey, quoted by Tillmanns.) SURGICAL DISEASES OF THE PELVIC REGION. 17 Judith were bom October 26th. 1701, and Hved to the age of twenty-two yeai-s;they died within three minutes of each other, on Feb. 8th, 1723. The autopsyshowed that, from the second sacral vertebra downward, the sacnmi and coccyxwere single. Both vagime terminated in a single vulvar orifice, and there wasa single anal orifice for the two rectums. Millie and Christine, the negro sistersborn in Columbus Co., North Carolina, in 1851, were observed and reported byman\ different authoiS, and are said
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