86 A. A. W. HUBRECHT. 
In a yet higher degree than the other Prosimiz, Tarsius was 
recognised by the older anatomists to be intermediate between 
Insectivora and Primates. Burmeister, in the preface to his 
‘ Beitrage zur naheren Kenntniss der Gattung Tarsius,’ writes 
as follows (p. 6) :—“ ‘Tarsius possesses, in addition to its con- 
siderable external similarity to monkeys, the most complete 
insectivorous dentition which Quadrumana can boast of, for 
even the incisors have adopted the type of the canines, and 
have thus become eminently like the true dentition of the 
Insectivora. In this Tarsius differs from all other Prosimie.” 
The non-pregnant uterus of Tarsius has been figured on 
pl. 6, fig. 22, of the above-mentioned work. 
The author thus describes the internal female organs :— 
«‘ They consist of two small ovaries, the coiled oviducts, and the 
two-horned uterus. . . . The ovaries are small spherical 
bodies, half a line in diameter; their surface is quite smooth, 
and their inner substance is of the ordinary condition of that 
of the higher mammals. . . . The uterus is two-horned, 
each horn being three inches long ; then follows the unpaired 
portion, which attains to half an inch, and externally passes 
into the vagina without any interruption. On the inner sur- 
face I could, however, detect a faint boundary as an ostium 
uteri. The uterus horns, as well as the unpaired portion, 
have thick walls, and show numerous considerable folds.” 
I have now before me several dozens of non-pregnant and 
early pregnant Tarsius uteri, and I have little to add to Bur- 
meister’s observations. There is, however, very often a strongly 
marked difference in size between the two ovaries, one swelling 
up to the size of a pill, the other remaining considerably 
smaller. I was inclined to believe that this difference in size 
might go parallel with fecundation, and thus indicate the 
presence of an early developmental stage in a uterus with one 
of the ovaries thus swollen. Series of sections in which the 
uterus lumen and that of the oviduct have been most care- 
fully scrutinised, oblige me to give a negative answer to this 
conjecture. The cause of this swelling of one of the ovaries 
was investigated, and will be treated of elsewhere, It was 
