Archive image from page 177 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 962 TERATOLOGY. Fig. 619. The skeleton of the foregoing Aceplialus. a, mobile bone connected with the single cervical vertebra. always twins, and not full grown. As far as it has been mentioned by different obser- vers, there is either a common placenta, with two cords (Ponjol), or with one cord split into two (Mery) ; or there are two placentae connected together (Herhoklt); or there are two totally separate ova, with a double placenta (Moiiro). The ext
Archive image from page 177 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 962 TERATOLOGY. Fig. 619. The skeleton of the foregoing Aceplialus. a, mobile bone connected with the single cervical vertebra. always twins, and not full grown. As far as it has been mentioned by different obser- vers, there is either a common placenta, with two cords (Ponjol), or with one cord split into two (Mery) ; or there are two placentae connected together (Herhoklt); or there are two totally separate ova, with a double placenta (Moiiro). The external appear- ance differs from that of the fourth type, by greater length, and less truncated upper part of the body, in which a feeble indication of head may sometimes be visible (Ponjol, Prochaska). The integuments are as in the fourth type ; the toes are generally mal- formed ; the arms and the external genital organs are often abnormal. To the lumbar part of the spinal column is joined an imper- fect osseous thorax, sometimes with cervical vertebras (Ilevermann), but without thoracic viscera. The diaphragm exists in most cases. There are vessels without a heart, which cohere with the umbilical vessels. The viscera of the epigastric region are commonly want- ing ; Atkinson mentions only a liver. In some intestines can be recognised either as intestina tcnuia or crassa. The uropoietic organs, and the internal parts of generation are commonly pri'sent. There is in all a spinal marrow. The observations as to the nervous system are very incomplete. (SecJigs. 618, 619.) Sixth Type. — Acephali ivith a trunk com- posed of a thorax and an abdomen, and with two superior and two inferior limbs. — When the trunk is more developed, the thorax becomes more convex, is more distinct from the abdo- men, and supports two superior limbs. These acephali, too, are twins, at least in the greater number of the cases. They are often not full-grown, and borne by women who have frequently bee
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