434 DR. p. CHALMERS MITCHELL ON LONGEVITY AND 



single case of relatively high longevity, that of a Lion Marmoset 

 which lived in the Gardens for over 9 years, has given those of the 

 genus Midas an average duration of nea,i-ly double that of the 

 representatives of Hapale. Even this fortunate instance, however, 

 does not disguise the low viability of Marmosets under the 

 conditions of their captivity. As these animals spend a large 

 part of their time in their sleeping boxes, unwise feeding by 

 visitors cannot account for much. On the other hand, they have 

 been treated as animals that required special protection from cold 

 and fresh air. 



Miss C. Morey informs me that she has kept a marmoset for 

 1 6 years ; it was allowed great freedom and had constant access 

 to fresh air. 



LEMURES. 



No. of Av. dur. Max. dm-. 



EeMURID^E. Iiidiv. in months. in months. 



Ze?mtr, whole genus 155 25-3 134 



L.alhifrons 16 43-6 113 



L. albimanus 1 36 36 



L. hrunneus 22 25 98 



L.catta 33 19 ,38 



L. coronatus 10 1 9-5 55 



//. Jiavifrons 1 45 45 



L. macaco 17 46 134 



Z. mayoUensis 12 2 



L. mongoz 7 39 122 



L.niger 3 63 107 



L. nigerrimus 2 30-5 43 



L. nigrifi'ons 3 23 46 



L.rvbfifrons 13 27 113 



L. rufipes 3 22 29 



L. vai'ius 10 20-9 77 



L. xaoithomystax 13 29 72 



Hapalemur simus 2 5'5 8 



H. grisetts 6 22 58 



Chirogaleus coquereli 8 82 184 



C.milii 2 70 138 



Microcehus smithi 14 20 84 



Galago, whole genus 61 22 86 



G. alleni 3 9 15 



G. crassicaudata 7 16 34 



G. garmtti 20 17-5 43 



G. maholi 25 26-7 78 



G. monteiri 6 32 86 



JVycticebus jai-anicus 1 21 21 



JV. tardigradus 29 13 49 



Loris gracilis 12 3'4 7 



Perodicticus potto 18 9-3 22 



C'hiromys madagascariensis 3 36-3 107 



