ORCELLA. 395 



it is worthy of remark that the majority of Cetacea hitherto observed in utero have 

 been developed in the same horn. This foetus I removed with my own hands, and I 

 am therefore in a position to say that its relations to the uterine waU were the same as 

 those which obtained in Platanista, under which species the uterine and foetal rela- 

 tions will be fully described. The uterine walls, at the full period, are however, much 

 thicker than those of Flatanista (Plate XXXV, figs. 4 and 9), and the mucosa is 

 much more spongy, and the crypts more numerous and much more regularly distri- 

 buted than in that genus. Scattered among the crypts there are considerably larger 

 infundibuliform orifices, and moreover the entire sm'face of the mucosa is not cryp- 

 tose. A long narrow bare surface commences about 6 inches from the uterine orifice 

 of the left Eallopian tube, and continues along the lower wall of the fecundated horn 

 for about 3 inches beyond the point where the horn bends on itself at the septum. 

 In one instance in Platanista this bare area occurred ; whereas in another and more 

 matured uterus it was absent ; the nude surface of the chorion being present in both 

 cases. I have not observed it in the Bactrian camel, and no trace of it is visible in 

 the uterus of a Tapu% the foetus of which was nearly fully mature, and the chorion 

 of which had this area, free of viUi, enormously developed. Besides this elongated 

 tract free of villi, a very limited area occurs at each Eallopian pole of the two horns, 

 and which has been figured at Plate XXXIII, fig. 3 f. This bare surface however, 

 appears more properly to belong to the mucous surface of the Eallopian tube itself 

 than to the uterine cavity. 



The bare or non-cryptose areas which have been described, — namely, the smooth 

 surface at the os uteri internum, the long tract free of villi foUowdng the course of 

 the locaHty of opposition of the umbilical vessels after they divide on reaching the 

 chorion, and the very limited bare surface of a doubtful nature at the Eallopian 

 orifice of each horn, — would appear to differ structurally from the following bare 

 surfaces. 



Smooth spots. — The whole of the inner surface of the uterus, right and left horns, 

 is irregularly studded over with smooth spots free of cryptose structure. The spots 

 are of various shapes, but they generally have a more or less rounded appearance but 

 are of different sizes, varying from 0'05 to 0"20 of an inch in diameter. They form 

 denser groups in some places than in others. Even with the naked eye when 

 a good light is allowed to fall at an angle on the uterine surface, I could detect what 

 appeared to me to be an orifice in the centre of many of these smooth spots, and this 

 I have also observed in Platanista and to a much more marked degree on the 

 uterine surface of the Camel and Tapir, but only to a very limited extent on the 

 uterine mucosa of Manis. 



The surface of the fecundated horn is thrown more or less into rugose folds, 

 which tend to radiate from the point where the horn bends on itself opposite the 

 septum which divides the two horns, but they are not well marked except at the 

 point indicated, and in the neighbourhood of the surface of the Eallopian tube from 

 whence they radiate longitudinally. Eugose folds also occur in the long axis of 

 the portion, of the cavity immediately above the os uteri internum. In the unfecun- 



