HRDLICKA ] BRAIN WEIGHT IN VERTEBRATES 109 
II. ARRANGEMENT BY AVERAGE OF RELATIVE BRAIN WEIGHT.— 
Continued. 
MAMMALS. 
Proportion of | Proportion of 
Brain to Body. | Brain to Body. 
Species. ee Species. - -A-———-, 
Aver. Indvs. | ; Aver. Indvs. 
m to..; x to... | EXtOle-. Lato! a. 
Belgian Hare, h 296 | Onychogale frenata, 922), @ 322 
Canis nubil., 25r a 251 | Tatu novemcinctus, 228 a 328 
Sheep, merino, 254 @ 254 | Trichosurus fuligin., p42 &@ 342 
Ursus torquatus, 260 «a 260 | Thylacinus cynoc., 348 a 348 
Antilocapra amer., 265 a 265 | Sheep, Shropshire, EGR EE BIS? 
Ovis tragelaphus, 271% @ 271 | Felis concolor, Bis! 9 CBS) 
Macropus, 276 a 276 | Ursus horribilis, Buea a goe 
Odocoileus truei, 288 «a 274 | Capromys pilor, 397 + & 344 
GE2025|| 6 450 
Petrogale, 379 =a 296 | Melursus ursinus, Cp) Ep) 
& 342 | Alces americ., 669 a 669 
BIRDS. 
Sporeeginthus amand., pn Lae 2 Paroraria, sp.? 25 a 24 
6 15 b 26 
Gok Bull Finch, ZOe ae 20 
Leiothrix lutea, Z5  @ 15 | Munia oryzivora, 26.6 a@ 22 
Erithacus rubec., 7 Seta an ps NC) 6 25 
6 16 c 28 
Sylvia atricapila, 7 Oe mele ad 29 
Munia malacca, HO). 2 NS) é 20 
Parus, 7g @ 1g | Falco sparverius, 27 tS H7, 
Gold Finch, 2r a 1g | Corvus monedula, Bye RG Pi] 
bo 2 Paroaria cucullata, AG (ti I 
meet fn (ls 
amet. cen26 
Junco hyemalis, Zr oe 20 ah <P 
Passer domestic, 22> ian 22 e027 
Xanthura luxuosa, 22) 2. 19 i 2h 
6 25 & 29 
Paroaria larvata, 227 2 h 32 
6 23 | Callopsittacus n. holl., 28.28 
c 24 | Brotogeris jugul., 20 aaa 29 
Megascops asio, 23 @ 23 | Zonotrichia albicol., GO. id 30 
Carpodacus purpur., 23  «@ 23 | Cardinalis cardin., Ona 30 
Melopsittacus undul., 23.5 a@ 20 | Cyanocitta cristata, ef a 30 
6 27 | Alauda arvensis, Sie Gh me eh 
Serinus, 23.9 @ 20 | Munia (‘‘ weaver-bird”’ ) 37 a) 28 
DO b 34 
¢ 22 | Mimus polyglottus, Seine 1.25 
d 23 b 35 
Cares ¢ 37 
f 23 | Psittacus erithacus, 36.5 a 35 
g 24 & 38 
A 24 | Agelaius phrenicus, Gi Sy 
2 25 | Amazona panamensis, B7.& B35 
J 25 Bess 
k 25 6.30 
20 ad 39 
Mm 27 Co aw. 
wz 27 | Amazona leucocephala, Qeisee Bu 
Acanthis cannabina, 24 @ 24 C37 
Melospiza cinerea melod., Bi een, e039 
Rail, AS! > PS Lea 
