) 



114 ju'LLjyriN :u, iimtki) statks natioval muskum. 



or soinctiiiii'.s bliirkisli, and tlic imiz/lc is latliiT iil)riii)tly sIioHcikmI. 

 The tiiil lias a liii at its oxtivinity, wliicli extends also wi'll aiiti'iiorly on 

 tho snpeiior t'd;;e. The dij^its arc Ihittcned, and their apices are pro- 

 tected in many specimens by a liorny cap of a blackish color. This 

 larva, however, dillers lioni that of other species of the ;;cnns in otlier 

 characters of more iniportance. First. There are no teeth on thesi»Ien- 

 nial bone. (I have not examined very small specimens.) Secondly. Tln^ 

 branchia- have a peculiar shape.* There are no processes such as exist 

 in all other Urodcle larva-, but the linduia' arise from the edj^es of tlie 

 vertical lamina-, which separate the pliarynj,'eal lissnres (Fi.i;. 3, p. ,'{, No. 

 7). The superior ))art of the lamina is a little more produced than the 

 inferior, so as to form in some specimens, on the third lamina, a short 

 ju'ccess. This type of external branchia- do(-s not n-semble any of 

 those of the perennil)ranchiate types, where theie are always \mH',- 

 esses which are fre(piently furnished with more or less numerous rami. 

 Thirdly. The teeth of the larva are stronjicr than in the adult. They 

 are compressed, doubleedj^ed, and acute, liavinj,'' thus a da.y<;er shape. 

 They can iullict a severe bite. 



As they approach maturity the marbled (-olois be^in to appear. 

 They can probably reproduce without under^oin^' a metamorphosis, 

 since I have found e;ij?s in the ovaries ready lor dc])osit. 



I observed these larv.i.' in some tributaries of the ^IcCloud IJiver, 

 near Baird, Cal. They swam with .ureat rapidity, darting' about and 

 hiding tlemselves amonj;' the fallen leaves that covered the bottom, i 

 took from the stomach of one of them a larva of its own si)e(!ies (»f on«-- 

 third its size. They are common in the mountain streams of northern 

 California-aud western Ore<;on. The skeleton of a lar^e sjtecimen friun 

 iSalenj, Oregon, is li^'ured on Plates L'O-L'l.* The hyoid apparatus of a 

 youuger larva is reprcscuted ou PI. 22, lijjs. L*-o. 



1 /Ci 



LIXGILELAPSUS Cope. 



American Naturalist, I'^'y", p. S8. 



Otoglossal cartilage free from the basibranchial, and capable of an- 

 teroposterior movement on it, and not forming a ring. Tail cylindric. 



In other resi)ects this genus is identical with Amblystoma. The dif- 

 ference in the otoglossal cartilage is great, and is presented under mod- 

 ihcatious by two species. This cartilage is drawn backwards by two 

 pubohyal muscles, and forwards by two corres[)onding geniohvals. 

 (Plate 22, tigs. 10-13.) 



The species of Lingua-lapsus resemble in the character of their tongui- 

 aud vomerine teeth the typo of C. microfitouius and the genus Chondro- 



* Sec pafjo ;jl, aiitea. 



• TIio fourth L-eratobraucbial was present iu thin speciuieii, but was overlooke.l by 

 the artist. 



J^' h'pturu 

 l»etw(H'n t 

 of several 

 and .separ; 

 The ski I 

 «i<les are c 



-■^y, 



