408 FRANK R. LILLIE 



luteum in it. The chorion was single with a broad connection 

 occupied by cotyledons between the two halves. 



4. Case 37. d^ 16 cm.; ^ 15.5 cm., figure 15, urinogenital 

 system of ^ . X 2. 



This figure may be compared with figure 11 (normal male of 16.8 

 cm.) and figure 9 (normal female of 17 cm.). The exceedingly 

 rudimentary condition of the gonads is at once evident, about 

 two-fifths of the length and one-third of the breadth of the nor- 

 mal ovary. The ducts appear to be Wolffian ducts. An ex- 

 traordinary feature of the anatomy which recurs in every ^ 

 specimen of this or greater size is the development of a pair of 

 gubernacula from the inguinal fold, which penetrate the muscu- 

 lature precisely as in the male (fig. 11) and teach the integu- 

 ment, extending well down to the groin. In the normal female 

 the round ligament is definitely formed (fig. 9 A and B) in place 

 of the gubernaculum, the horns of the uterus are definitely 

 differentiated from the Fallopian tube, the vagina is enlarged. 



History. Bovine twins d" and ^. Collected January 25, 

 1916. Both maternal ovaries present, each wdth a single corpus 

 luteum. The uterus was damaged by a cut above the cervix 

 and the two halves of the chorion severed. Examination showed 

 that the chorion had been single with both arterial and venous 

 anastomosis between the two halves. Cotyledons continuous 

 from side to side. 



5. Case 6. d 16.8 cm., <^ 16.3 cm., figure 16, urinogenital 

 system of female, (cf. Miss Chapin's description of the his- 

 tology of this specimen and interpretation of the ducts.) 



For comparison normal female of 17 cm. (fig. 9) and normal 

 male of 16.8 cm., twin to this specimen (fig. 11). 



The very minute size of the gonads is again apparent. Guber- 

 nacula again take the place of the round ligament. The Miil- 

 lerian ducts are undeveloped. Seminal vesicles, however, have 

 not begun to form (cf. normal male, fig. 11) ; the contrast between 

 the genital cord of the ^ and normal 9 is very striking. 



History. Bovine twins. Collected March 4, 1915. Only one 

 of the maternal ovaries was present; corpus luteum in it. Single 

 chorion for the twins somewhat constricted. No record of 

 vascular conditions. 



