<)10. 



AN'D lUOLOOV or TIIK I.AIKiKK CKTACKA. 



775 



(Ml lookin;^' tliroiiLi'li t]n: ( !('t,iic(';ui lil,(!i';it,iin^ iJicrc ii|)|»c;ir.s l.o \>i'. 

 no rccoiil of ilie oc*(Mii'r(,'iic(; of luiii-s in iidiilt (Jdontoc-dtcs. \t 

 would scnin tliiit the presence of li;urs in tlie iuinlt, is resti-ictcd to 

 the W'liiil(4)one Whiiles ; iiiid their retention imd distribution over 

 the beak and inandibh^ in these foririH iiwiy be due to tlieir 

 possessiiiff a tiietile funetion iuid tluis sei've to iiidicfite to the 

 iuiinml the ))i'(»sence of its food. 'I'he sinnll size of the CrustM.cea 

 which generMlly form tlie food of tlu; My.stiieofeti make tlieni 

 fliilicidt to see, and since tlie olfactory oi-gn.ns of the Cetiiceji, Mro 

 veiy reduced, the occuri'ence of tactile luiirs over the oimI rej^ion 

 may be an Ji,dv!int;i,<fe, jis the smsill food-iUiiniMls mif^Iit brusli 

 jigainst tiuim and thus inform the wliide when to o[K;n its moutii. 



Text-fiff. 70. 



L:iU-ral view of (Ik; licad (iT J{a/f/:ii(i/ilrr<i .siljliahlii Ol'ily, lo sliiiw tlic liairs. 



'The t(i)» of the snout of -.i whnJc is, of conrsc, only Uie ])rol(i)i,i;('(l 

 u[>p('r li[), where one would niitninlly look for \ ilji'is.sn'. I n on(3 

 of the figures given l)y Sais in the p;ipcr ;d)o\c nicntioncd, whiit 

 iip[)eiirs to })e a nerve is seen triiversing the blublter at the biise 

 of th(^ liJiir; which would point to ;i, tactile function. On this 

 theory, the food of the Odontocete.s Ix-ing of a larger size the 

 ])resence of tactile haiis is not so obviously re(piired, and heiute 

 tlu! hairy covering hns entirely \iinislic(| in 1hi' ;iduh, foiius of 

 these whales. 



(Ju tlie other hand it is Jikso (;onceiviJ)le that the vil)riss{e, 

 because of their relative stoutness, should lie the. hist haiis to 

 disa|)pe!ii" ; ;nid Ihc fact that they have reacluMl a, fui-ther stage of 

 degeneration in the- Odontocetes than they have in the Whalebone 

 Whales may be ]»urely accidental. 



^V . 'I'mh Acdj'I'orv OiffiA.v OK B.\i..i:\oi'-ii:nA. 



'Hie anilildi-y appai'atiis 'ii several i)idi\ idiials of liabi iioplcra 

 wii,sryiili(.n and li. sihhaldii was exaniiiKid with some dilliculty, 

 Tlie parts of the ear agreed fairly well in both these species with 



