DESCRIPTIONS OF PLATES. 



169 



dead for some weeks, and this is indicated also by the 

 relation of the menstrual age of 32 weeks and 5 days 

 to the anatomical age of 29}^ weeks. 



No. 1027. 



(1) H. B. Titlow, Baltimore, Maryland. 



(2) 130X80X50 mm. 



(4) The placental area of the chorion is firm and partly 

 converted into a gristle-like substance. The remnant of 

 the chorion is opaque and thickened, except for an area 

 40X50 mm., which is translucent. The chorion contains 

 a brownish fluid and a brownish, macerated fetus with 

 several turns of the umbilical cord around the neck. The 

 extremities are very distorted. 



(5) Microscopic examination of the placenta presents 

 the picture typical of long retention. The vessels are 

 largely degenerate. The epithelium ia necrotic or wholly 

 absent and the stroma fibrous and degenerate. In places 

 growths of villi are matted and fused into a solid mass, 



forming the so-called "infarcts." The decidua also is 

 very degenerate, but some fairly well-preserved blood 

 still is contained in the intervillous spaces and also in 

 some of the dilated villous vessels. 



No. 1028. 

 (1) G. J. France, Baltimore, Maryland. 



(3) Last menstruation occurred September 25 to 27, 

 and abortion December 18. 



(4) The specimen is a very badly macerated and dis- 

 torted fetus with compressed and twisted extremities, and 

 portions of the body barely recognizable. 



(5) One of the umbilical vessels (apparently an artery) 

 is almost completely obliterated, while the other two 

 vessels show little change. Perivascular infiltration is 

 absent. In spite of the marked maceration and disin- 

 tegration, the subcutaneous vessels still show in some of the 

 digits, and the striations and voluntary musculature are 

 splendidly preserved. 



DESCRIPTIONS OF PLATES. 



PLATE 1. 



Fia. 6. Old retained hydatiform degeneration. No. 323. Xl.25. 



FIG. 7. Abnormal conceptus. No. 1843. X6. 



Fia. 8. Decidual cast containing remnants of conceptus. No. 698. X 1. 



FIG. 9. Festoons of chorionic epithelium. No. 1324. X300. 



Fio. 10. Detached conceptus, still in ulero. No. 1224. X6. 



Fia. 11. Almost total lysis or gossamer form. No. 606. X69. 



PLATE 2. 



Fio. 12. Villi showing hydatiform degeneration. Same specimen as fig. 10. 



Fia. 13. Hydatiform tubal twins in situ. No. 825. X3. 



Fia. 14. A fine hydatiform villous tree in section. No. 367. X 10. 



Fio. 15. Full-term nodule accompanying a twin donated by Dr. Slemona. No. 1682. XI. 1. 



Fia. 16. An unusual nodular form. No. 2288. X6. 



Fia. 17. Reniform nodular cyema. No. 1369. X4. 



Fid. 18. Cross-section of a nodular cyema, showing simple structure. No. 6510. X10. 



Fio. 19. External appearance of chorion containing small nodular twin. No. 7886. Xl.15. 



PLATE 3. 



Fio. 20. Cross-section of No. 7886, shown in fig. 19. X45. 



Fia. 21. Macerated normal cyema, No. 788a, companion to 7886. Xl. 



Fio. 22. Divergence in external form of cylindrical cyemata. No. 885. X4. 



Fio. 23. Illustrating marked changes in form and structure of cylindrical cyemata. No. 446. X6. 



FIGS. 24-26. Illustrating variation in form of cylindrical cyemata. Nos. 2236 (X9),2222 (X6),and 1776 (X6). 



Fio. 27. Longitudinal section showing structure of cylindrical cyema. No. 150. X15. 



Fio. 28. 

 Fio. 29. 

 Fio. 30. 

 Fio. 31. 

 Fio. 32. 

 Fio. 33. 

 Fia. 34. 

 Fia. 35. 

 Fio. 36. 

 Fio. 37. 

 Fio. 38. 

 FIG. 39. 

 Fio. 40. 

 Fio. 41. 



PLATE 4. 



Longitudinal section of cylindrical embryo. No. 489. X37.5. 



A cyema in the pre-gossamer stage of lysis. No. 2197. X6.75. 



Twin conceptus with larger chorion opened and location of smaller indicated. No. 587. XU.75. 



Part of the same conceptus in section, showing the cavities of both chorionic vesicles. Xl.5. 



Side view of cyema, showing so-called stunting. No. 2173. X3. 



Front view of same specimen, showing maceration and stunting. X3. 



Illustrating stunting. No. 2233. X4.5. 



External view of No. 2473, showing stunting in an older specimen. X3. 



Section of a similar fetus, to show structure. No. 675. X4.5. 



Sagittal section illustrating fusion of mandibular margin with chest. No. 788a. X4.5. 



Sagittal section showing internal maceration changes and gaping of the mouth. 



Macerated, firmly rolled-up, young fetus. No. 921. X2.25. 



Macerated, rolled-up, older fetus. No. 1041. X0.75. 



Cyema classed as fetuses compressus. No. 1245. X3. 



