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Tin: i',Aii;A('iii.v of noutii America. 



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M VII nil If mi Ilia of .Wo. 'lOr)?. 



Inchra. 



Li'll};tll iVniil siKMIt Id end III' ;;Ml>r ol' iiioillll 'I'l 



liCliiilll IVoiii siiiHil Id iiiilai' I'l "Id I. (Kt 



I,('Iih;I1i I'ntin siioiil to jintiii ;(.'><• 



Ia;ii<{IIi I'll Mil snout Id licliiiHl :iiiuh 4. ltd 



Lcn^tli I'nim .sin ml lo cini nl iail (alxiiit) H. f>ri 



Lciififli of lail (aid. II I) J.'i') 



Drlilliof tail (al iMl.l veil I) 1. '.>.") 



WiilMi of lua.l 1.00 



I^i'iiy;lli (if roicanii riiiiii clliow 00 



lA'ii^th (iC liiiiil li'if I'niiii kiu'ii 1. 10 



Slfftcli til" hi ml U"^ ;{. 40 



A spt'ciiiM'ii I'litirclv similar, j'xccpt in size and cnloiatioii, was round 

 l)v l>r. Horn near I'.ccsU'y's I'oint, N. .1., a well-known locality for the 

 ,sji('(;i('s. Till' tail is rcinarUaldy tliick and deep at tlu^ hasc, and only 

 cqiial from its hasis to tlic cantlins of month; a ;ii'oovo in the <lorsal 

 linelM'liind; tail not ^jroovcd. The color is a dark It'adcn brown, sprin- 

 kli'd cvc'rywlu'ic willi small yellow spots: spots larj^'ci- on tail; belly 

 yellowish. I'otal leii;;tli,i) iiielies and ."» lines. 



From iIh' preeediii;'' investijfation we j;allier that laival eliaraeters in 

 this speries are in part only eoiitempoiaiieiMis ; that the branehia' arc 

 lost (list; the toiiuiie develops next, and the te(!th last; that the de- 

 vel(»piiiei!t extends in older a^e to the leiij^lheiiiiin' ol' the i)ody and tail; 

 that the pro^^ress may be arrested at a time when any de^^i'et' of eom- 

 binatioii of these and other fealiires exists. That reprodnetioii may 

 take place at any of such dilVerent sta;;'es iseviileiit from the condition 

 (»f development of the ova ol' many ot' the various specimens, and it 

 is known to tak«' phn e in other species at earlier .slaves than any re- 

 eonled heie as juiiiit. 



It is also to be noted that specimens from New Jersey are almost 

 always more liill\ developed than those from the Western rej;ioiis; the 

 former is a wan. lei district than the latter. 0| two specimens from 

 New Orleans, howexcr, one only exhibits the deiititiona! charattter.s of 

 the New .leisey indiviilnals. The characters coinmon to the Western 

 individuals iiave occasioned the opinion that it was another species, 

 which was called A. iiKiroiiiiiiii. 



Of this l-rm i r*'maikedin my moiio;;rapli of the j-eims Amblystoina, 

 published in lSi7. already referred to, thai it "dilfers absolutely only 

 in the broader mii/,/le and wider separation of the: outer nares. The. I. 

 tiflfiniiiii i-etains in this case a feature characteristii^ of the larva of .1. 

 JHrirf*////^//* and of all other Siredon six'cii's. The ran^ie ol" color vari- 

 iitioii is only partly .' 'Vereiit in the two, but the majority of s|)eei- 

 mens ea(;li lielon;;' to iliifercnt color lypt s. lOach occupies a ditVerent 

 ^'eon'iaphical area, both ol which are well marked in the distribution of 

 many other reptiles. Nevertheless, ultimately I think it tpiite possible 

 thai they will have to ln' viewed as develnpiiiental forms, like so many 

 other su[)i)osed species which are not siilliciently isolated from ouo 





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