182 Zoological Society. 
lateral: in Echidna the prenasal is replaced by scales, and the post- 
nasal is much developed above the nostril, which is usually vertical ; 
in E. Atropos the nostril is vertico-lateral. 
One specimen of this Vipera belongs to the Academy of Natural 
Sciences of Philadelphia, and another is in the British Museum. 
For an opportunity of examining and figuring the latter, my acknow- 
ledgments are due to the distinguished officers of the institution, 
Drs. Gray and Ginther. 
Recorp OF THE PERIOD OF GESTATION OF CERTAIN RvuMI- 
NANTS WHICH BREED IN THE SOCIETY’s GARDENS. By P. 
L. Scuater, M.A., Pu.D., F.R.S., erc., SecRETARY TO THE 
SOcIETY. 
The period of gestation of certain animals of the class of Rumi- 
nants which habitually breed in the Society’s Menagerie has been 
ascertained with tolerable exactness. Of course the period is slightly 
variable ; but the times given in the following list are, on the average, 
very faithfully adhered to. 
Fam. CervID&. 
Wapiti Deer (Cervus canadensis)... | 
Persian Deer (C. Wallichii)...... 
Barasingha Deer (C. Duvaucelit). . 
Japanese Deer (C. sika) ........ 8 th 
Sambur Deer (C. Aristotelis) .... eagt 
Rusa Deer (C. rusa)............ 
Hog Deer (C. porcinus) ........ 
Was Deer (C. arte) celle sate vs J 
Fam. CAMELID. 
Lama (Auchenia glama) ........ 
Alpaca (A. pacos).0.. ..00..-. 0% } 11 months. 
Fam. CAMELOPARDID. 
Giraffe (Camelopardalis giraffa) .. 15 months. 
Fam. Bovip#. 
Punjab Wild Sheep( Ovis cycloceros) 
Mouffion Sheep (O. musimon).... Sa 
Leucoryx Antelope (Oryx leucoryx) 8 months. 
Eland Antelope (Oreas canna) .. 9 months. 
Nylghai Antelope (Portaa picta). Between 8 and 9 months. 
The Hippopotamus has never bred with us ; but I may state that 
the period of gestation in this animal is known to be short. The 
female in the Amsterdam Gardens, which has twice produced young 
in that establishment, went only 7 months and 16 days on the first 
of these occasions, and 7 months 20 days on the second. 
