loO pages with sixteen plates, and shows that a large amount ol 

 has been done. The entomological department has a special i 

 appropriation of $5,000 which enables it to carry on extensiv 



In the December, 1895, Bulletin of the Tennessee Station, Chas. E. 

 Chambers discusses the Chinch Bug. 



Mr. Frank Benton's admirable Manual of Instruction in Apiculture, 

 issued as Bulletin No. 1, New Series of the United States Division of 

 Entomology, is being most cordially welcomed by the bee keeping fra- 



EMBRYOLOGY 1 



Morphology of the Tardigrades. 2 — R. v. Erlanger has published 

 the results of his observations on the early development of Macrobiotics 

 macronyx Dujardin. The division of the egg is total and equal, seg- 

 mentation resulting in the formation of a long oval blastula with the 

 segmentation cavity located nearer the posterior, more pointed pole. 

 Regular gastrulation takes place, with the cells of both ectoderm and 

 entoderm at the anterior more flattened, pole considerably larger than 

 those posterior to the blastopore, this difference being noticable through- 

 out the entire development. The embryo bends ventrally and the 

 entoderm becomes constricted into two sections, the anterior, the germ 

 of the oesophagus together with the sucking stomach and the posterior, 

 the germ of the true stomach. The ectodermal cells of the anterior 

 and ventral walls increase in number and size, representing respectivelv 

 the starting points of the eyes and ventral nerve chain. The hind gut, 

 extending dorso-ventrally, represents the third division and is in open 

 communication with the blastopore. In the ensuing stage the blasto- 

 pore becomes closed and later the true anus breaks through in the same 



Up to this stage the embryo has consisted of but the two primary 

 germ layers. The mesoderm develops as paired coelomic pouches from 

 the Archenteron, the first pair appearing at the posterior end of the 

 embryo forming the fourth segment, the second pair in the anterior end 

 giving rise to the first segment, the third pair in the second segment 



1 Edited by E. A. Andrews, Baltimore, Md., to whom abstracts reviews and 

 preliminary notes may be sent. 



1 Morph. Jahrbuch., Bd., XXII, 1895. 



