ECAUDATA. Bept. 19 
[Pfluger, E.] Ueber die parthenogenetische Furchung der Eier der 
Amphibien. Arch. ges. Phys. xxix. [1882] pp. 40-44. 
No segmentation of the Batrachian ovum can take place without 
fecundation. 
. Wirkt der Saft der Hoden uicht briinstiger Mannchen befruch- 
teud? L. c. pp. 44-48. 
The fecundating power of the seminal gland of the Erog decreases 
strongly after the breeding season, but is preserved certainly over a 
mouth. 
. Das Ueberwintern der Kaulquappen der Knoblauchkrote. Ein 
Beitrag zur Lebre von der Anpassung der Organismen an die 
ausseren Lebensbedingungen und zur Diagnose der Batrachierlarven. 
Op. cit. xxxi. pp. 134-145. 
Besides the record of a case of hibernation of larvae of Pelobatesfuscus, 
with remarks on the adaptation of Batrachians to a colder climate by 
means of larval hibernation, this contribution contains the distinctive 
characters of the tadpoles of Pelobates fuscus , Bombinator igneus , Alytes 
obstetricans, and liana esculenta. 
, & Smith, W. J. Untersuchungen iiber Bastardirung der anuren 
Batrachier und die Principien der Zeugung. I. Thiel. Experimente 
iiber Bastardirung der anuren Batrachier. Op. cit. xxxii. pp. 519-541. 
Crossing different local forms of Rana temporaria and R. esculenta , 
R. temporaria and R. arvalis, R. arvalis and R. esculenta, R. arvalis 
and Bufo vulgaris, &c. Fecundation of R. temporaria by R. arvalis 
had no effect, whereas the reversed process produced a few hybrids 
which fully developed. 
. Untersuchungen, &c. ii. Thiel. Zusammenstellung der Ergeb- 
nisse und Erorterung der Principien der Zeugung. L. c. pp. 542-580. 
The author sums up the results of his and Born’s experiments. The 
specific distinction of Rana temporaria and arvalis is again proved. 
Reciprocity in hybrid fecundation is proved, but it is not the rule. 
Poiil-Pincus, — . Uber die Muskelfasern des Froschherzens. Arch. 
Anat. Phys. (Phys.) 1883, pp. 272 & 273. 
Roux, W. Ueber die Zeit der Bestimmung der Hauptrichtungen des 
Froschembryo. Eine biologische Untersuchung. Leipzig: 1883, 
8vo, 28 pp. 
Wedenskii, N. Notiz zur Nervenpbysiologie der Krote. Arch. Anat. 
Phys. (Phys.) 1883, pp. 310-312. 
Ran HMD. 
Rana septentrionalis, Bd. (= R. circulosa , Rice & Davis), described by 
Boulenger, Ann. N. H. (5) xi. p. 16. 
Rana inguinalis, Grthr., = Limnodytes madagascariensis, A. Dum.; 
id. 1. c. p. 17. 
