504 



BULLETIN ;U, UNITED STATES NATIONAL MUSEUM. 



\ 



Fig. 3. Ilyoid ni)paratnM of adult, from below. 

 4. Skull ot'larvn, I'roiii aliovf. 

 fi. Skull of larva, from below, 

 fi. Hyoid aiijiaratus of larva, from above. 

 7. Basis crauii of very yonn>{ Inrva. 



PLATE XL. 



Crodela, viscera isolated autl much enlaruetl. From tlrawiny by I'rof. 8. F. Baini. 



Fig. 1-2. Spehrpcs riiher, kidney and vas deferens, 5. 



1. The tubules of the kidney displayed from above; (/. iunreat»T ditail 



from below. 



2. The \ asa efterentia ; diagrammatic. 



U. (iyrlnophUus porphyrilicun, liver and central circulatory system of a liirj^o 



larva. 

 4. Pklluxloii yliithi09U>i, 9, liver, natural size. 

 5-9. Diemyiiytiis ririihscciiH, 5 . 



;'),G. Reprodiietivo organs an»l cloaca of male. 



7. Kijrht corpus adiposum, inferior surface, X 4. 



8. Testis. 



y. Kidney, vas deferens, and va.sa etferentia. 



PLATE XLI. 



Central nervous system of Urodela, enlarjjed. 



Fio. 1. Spihrpfs nilxr, from above; a, from below. 



2. Jmhlyatoma jutuctatuin, 9, brain and cranial nerves of the left siile from lir- 



low. The cranial nerves are numbered. (;, Ga.sserian gan<;lioii ; («. 1 un- 

 necting branch between trijieminus and facial nerves ; /,, jiart of l;ib\ rimli. 



3. DiemyvtyhiH riride^ccitx, brain, from abo\e; u, from below ; h, from left siilf; 



/'(■, prosencephalon ; Up, epiphysis; JA\ thalamence)dialon ; ME, niesiu- 

 cephalon ; EIi, epenceidialon ; /(', fourth ventricle: //i/j>, hypophysis. 



4. Dinnyctylii'i viridvicttiD, semicircular canals. 



PLATE XLII. 



Larval and breeding stages of Salamanders. 



Fig. 1. GyriHophiliis porphyritiiKK larva, natural sizt-; June :{. 



2. Spckrprs loiHiicaiidiis larva x 4; May 21i. 



3. DkmyclylKK viriihscciin, breeding male, natural size ; a inferior side of hind leg, 



showing corneous nuptial excrccences, and tips of digits. 



PLATE XLIII. 



Siren lacertina, skeleton from below, two-thirds natural sifc. 



PLATE XLIV. 



Siren lacertina, splanchnology; three-tifths natural size. 



For lettering see general explanation. The mesentery is divided so that the ali- 

 mentary canal can be extended outw,ird to the right side, so as to display ilie 

 other organs. The lines VM and Mes, on the right of it, extending from the testes ici 

 the gall-bladder represent the borders of the gap opened by the section. 'I'lie 

 cloaca is divided, exposing the mouths of the urethra and ureters. For heart :ii.il 

 vessels see Plate PJ, tig. 5. 



IP 



iii 



