No. 405.] DEVELOPMENT AMONG ANURA. 713 
'42 VoGT, CARL. Untersuchungen über die Entwickelungsgeschichte der 
Geburtshelferkróte, Alytes obstetricans. .1842, p. 87. Solothurn. 
33 WAGLER. Descriptiones et Icones Amphib. Pt. 2, p. II. 1833. 
54a WEINLAND, F. D. Ueber den Beutelfrosch. Arch. f. Anat. u. 
Phys. Bd. xxi, p. 449. 
Lichtenstein's Remarks on Specimen of Notodelphys in Wein- 
land's Collection. Berliner Monatsber. 1854, p. 372. 
'98 WERNER, FRz. Ueber Brutpflege bei Amphibien. Verh. d. k. k. zool.- 
bot. Ges. Wien. Bad. xlviii, Heft 1, p. 11. 
TT Merk, B. G. Note on Embryo of Pipa americana. Am. Nat. 
ol. xi, p. 491. 
'90 Wountastonrr, W. Vollständige Entwickelung eines Frosches 
(Hylodes?) im Ei. JaZresber. u. Abh. Naturf. Ver. Magdeburg. 
1890, p. 317. 
‘54a —— WYMAN, JEFFRIES. On the Development of Pipa americana. 
Proc. Boston Soc. Nat. Hist. Vol. v, p. 13. 
'54b 
'54b Observations on the Surinam Toad, Pipa americana. Amer. 
Journ. of Sci. Vol. xvii, p. 369. 
57 On the Exhibit Pa Surinam, Hylodes lineatus. Proc. Boston 
Soc. Nat. Hist. Vol. vi, p. 269. 
'59 On Some Unusual Modes of Gestation. Amer. Journ. of Sci. 
: Vol. xxvii, p. 5. 
‘62 Dactylethra. Proc. Boston Soc. Nat. Hist. Vol. ix, p. 155. 
APPENDIX I. 
Since this paper went to press, there have ‘appeared the following notes o 
" Nototrema by Brandes, 99. “ Larven zweier Nototrema-Arten. Demons sies 
Verhandlung der deutschen Zool. Ges., g. Sahresvers, Hamburg, p. 288 
work, hind legs in the condition of knobs, horny teeth, and an operculum with a 
lateral spiraculum. Through the spiraculum project two filaments, which can be 
traced to the first and second gill arches of the opposite side. The filaments are 
expanded at their ends into a delicate membrane, spread out under the egg-mem- 
rane. The gills are thus reduced to two, both arising from the same side. In 
the larva examined, the yolk had been entirely absorbed, so that life in the egg- 
membrane was no o longer possible. A larva caught in water resembled a tadpole 
of the European Pelobates shortly before fonum qum 
JVototrema oviferum carries only thirty large e The tadpoles observed had 
well developed hind legs ; the tails had entirely degenerated ; there was no spirac- 
ulum, but through a broad slit in the operculum projected the two bell-gills 
described by Weinland (54a) Four gill arches were present, and the gill fila- 
ments were attached to the first and second arches. 
