1896.] Embryology. 761 
quently they have been observed to emerge from a burrow for their 
feeding. This usually occurred in the afternoon. On one of these 
occasions a little fellow was watched through a simple lens. It was 
interesting to see him bite off a piece of meat and swallow it with every 
evidence of satisfaction. The antennz were moved back and forth in 
the most appreciative way. As the larve increase in size, more bur- 
rows open upon the surface and they are seen lying at their mouths. 
One time two were seen out of adjacent burrows. The larger seized 
the smaller in the back and tried to drag it down into its burrow. 
The smaller was unable to escape, and when it was pulled away with 
forceps the body-wall was ruptured. At another time a smaller active 
larva was seen to attack a larger inactive one, which, unable to resist, 
was bitten so severely that the segment swelled considerably, but was 
not ruptured. In a day or two the larger died and was fed upon by 
its former persecutor. 
EMBRYOLOGY. 
The Wrinkling of Frog’s Eggs During Segmentation.— 
The occurrence of wrinkles in frog’s eggs during the process of seg- 
mentation was first observed and very briefly described by Prevost and 
Dumas, who have the honor of being the first observers of the segmenta- 
tion itself (Annales des Sciences Naturelles, I ser., 1824, Tom II, p. 
110). 
X somewhat better description was given later by Bär (Archiv. für 
Anatomie, etc., 1837) and Reichert (the same, 1841), who gave to the 
phenomenon the name “ Faltenkranz,” and made some attempt to ex- 
plain its nature and origin. 
By far the best description, and, indeed, the only really good one 
which has ever been published, is that by M. Schultze, which appeared 
in 1863 (Observationes nonnulle de ovorum ranarum segmentatione, 
Bonne). 
He gives an exceilent account of wrinkles observed in the eggs of 
Rana temporaria and R. esculenta, and concludes with an “ explanation 
of their origin.” But he really devotes only avery few lines to the 
explanation, and gives up the remainder of this portion of his paper to 
1 Edited by E. A. Andrews, Baltimore, Md., to whom abstracts reviews and 
ae notes may be sent. 
