Zoologischer Anzeiger 



herausgegeben 



von Prof. J. Victor CarUS in Leipzig. 



Zugleich 



Organ der Deutschen Zoologischen Gesellschaft. 



Verlag von Wilhelm Engelmann in Leipzig. 



XX. Band. 29. November 1897. No. 546. 



Inhalt: I. Wissenschaftl. nittheilnngen. 1. Montgomery, Preliminary Note on the Chro- 

 matin Reduction in the Spermatogenesis of Pentatoma. 2. Selenka, Die Sipunculiden-Gattung Phy- 

 inosoma. 3. Blochiiianii, Zur Epithelfrage bei Cestoden. 4. Wasmauu, Zur Biologie und Morpho- 

 logie der iomec/iusa-Gmppe. II. Uittheil. aus Huseen, InHtltnteu etc. 1. Simroth, Ein Vor- 

 schlag, die Bezeichnung »Conchiolin« durch »C'onchin« zu ersetzen. 2. Linnean Society of Nctf 

 Sonth Wales. Personal-Notizen. Vacat. Berichtigung. Litteratnr p. 581—004. 



I. Wissenschaftliche Mittheilungen. 



1. Preliminary Note on the Chromatin Reduction in the Spermatogenesis 



of Pentatoma. 



Thos. H. Montgomery, Jr., Ph.D. 



eingeg. 12. November 1897. 



Detailed descriptions and figures of this object, as well as compa- 

 rison of the literature, are reserved for a future publication. The 

 material was fixed in Hermann's fluid and aqueous solution of 

 corrosive sublimate. The outlines of the figures are drawn with the 

 camera lucida, with the 1/12 immersion lens and ocular 4 of Zeiss, 

 length of the microscope tube, 180 mm. The details of the spindle 

 fibres are not reproduced. 



Each of the testicles consists of a number (apparently 7) of parallel, 

 longitudinal tubules, and within each of the latter all the spermato- 

 genetic stages may be found. The division zone of the spermatogonia 

 is found at the proximal end of the tubule, the growth zone occupies 

 the remainder of about the proximal end of the tubule, on the latter 

 follows the zone of the spermatocytic divisions, next the zone of the 

 spermatids, while about the distal half of the tubule contains sperma- 

 tozoa. The succession of these different zones is clearly marked. 



In the spermatogenetic mitoses (fig. la; lb, pole view) 14 chromo- 

 somes are present; they are usually so densely grouped, that on lateral 

 view of the spindle the chromatin mass appears as a solid, heavy band, 



33 



