20 EINAR LOISINBEKG, ANATOMICAL NOTES ON EAST AFRICAN MAMMALS. 



scattered, partly crowded in groups without any order. The foetal membranes entered 

 into the other (left) cornu as well, and 15 cotyledons arranged in fo\ir rows could be 

 counted there. One of these rows was rather suppressed consisting only of 3 somewhat 

 smaller cotyledons. 



In another specimen of the same kind of Dik-dik with a bigger foetus the ar- 

 rangement of the cotyledons was much more regular. Four rows could very plainly 

 be discerned in the right cornu, which contained the foetus, even if there were some 

 cotyledons scattered outside the regular series. 57 cotyledons were counted in this 

 cornu. In. the other (left) cornu the strongly enlarged 15 cotyledons completely filled 

 the lumen, and they were so crowded that it was difficult to discern any regular 

 rows. The foetal membranes extended into this ^ornu as well so that it plainly 

 contributed to the nutrition of the foetus. 



In still another specimen of Dik-dik the condition of the uterus was found to 

 be somewhat different. In the right gravid cornu the arrangement of the cotyledons 

 was irregular, although on both sides there was a tendency of their forming series. 

 The number of cotyledons amounted to about 38 — 40, perhaps not fully as many. 

 In the other (left) cornu as well, the cotyledons were enlarged and in connection with 

 the foetal membranes. They were regularily arranged in four rows and also there 

 about 38 in all. The fact that in this specimen as well as in one of the others the 

 cotyledons of the gravid cornu were not regularily arranged in rows may be explained 

 as a result of unequal growth when the cornu became expanded by the foetus. It 

 is more strange that the non gravid cornu contained as many cotyledons as the 

 grax'id one when this was not the case in the two other specimens. It might perhaps be 

 guessed that this has been caused by the simultaneous pregnancy of both cornua at 

 the first conception and their equal development as a result of this, while in the two 

 others one cornu (the right) has become gravid, and in consequence of this only that 

 has been especially enlarged. For such an explanation may speak the fact that the 

 combined number of both cornua is pretty similar in both cases about 76 and about 72. 

 But another explanation may be quite as probable, and this will be set forth below. 



A gravid specimen of Red Forest Duiker {Cephalophus harveyi kenice) shot near 

 Nairobi in March had 18 rather large cotyledons in the right cornu which contained 

 the foetus. They sat partly at some distance from each other, but 4 rows could be 

 discerned with resp. 4, 4, 4 and 5 cotyledons. The other left cornu had only half the 

 number (9) of cotyledons which appeared to form three series with resp. 4, 2 and 3. 

 This small number of cotyledons corresponds with the condition found by the present 

 author in Cephalophus ogilhyi^ in which the cornu containing the foetus had 22 and 

 the other only 8 cotyledons. 



The gravid uterus of an Eland cow {Taurotragus oryx patter sonianus) had a great 

 number of cotyledons in the long right cornu which contained the foetus. About 

 53 could very plainly be counted, and they were arranged in four rows of resp. 15, 

 \2, 12 and 14 cotyledons. The other cornu is also long and occupied by the foetal 



1 Ark. f. Zool. Bd. 5. N:o 10, p. 10. 1909. 



