269 



derselben, die Taenia laevis Dies., verdient nach meinen Untersuchun- 

 gen, über die ich an anderer Stelle berichten werde, als Typus eines 

 neuen Genus behandelt zu werden, welches ich 



Diplopostlie^ 

 nenne. Die Diagnose hat zu lauten : 



Männliche und weibliche Keimdrüsen, Dotterstock 

 Schalendrüse und Uterus einfach; Leitungswege und Be- 

 gattungswerkzeuge doppelt. Typus: Taenia laevis Dies. 



Die von Di amar e ^ für Taenia lamelliger a Ow. avifgestellte Gat- 

 tung Amahilia ist zu unvollständig beschrieben — angekündigte wei- 

 tere Angaben blieb der Autor bisher schuldig — , um T. laevis auf sie 

 beziehen zu können. 



6. Note on the Fate of the Parent Stock of Autolytus Ornatus Verrill. 



By P. Calvin Mensch, Collegeville, Pa., U.S.A. 



eingeg. 19. April 1896. 



In a collection of specimens of the parent stock of Autolytus or- 

 natus Verrill, made at Woods Holl last summer with a view of study- 

 ing the mode of budding in this Syllid I found a small number of 

 individuals from which the stolon had quite recently parted. These 

 were composed of 1 3 setigerous segments and bore at the extremity of 

 their last segments bi;d-like outgrowths of embryonic tissue in slightly 

 different stages of advancement, having a length corresponding to 

 about the width of the body of the animal. The buds gave evidence 

 of segmentation anteriorily and bore a rather prominent anal segment 

 to which was attached a pair of wellmarked caudal cirri. In several 

 specimens traces of dorsal cirri were present on two or three distinctly 

 developed segments in the anterior part of the bud. 



Upon sectioning one of these specimens I found that it contained 

 eggs in the 1 Uh, 12th and 13th setigerous segments. The sectioning 

 of several more such specimens presented a similar condition. One 

 individual entirely like the others showed the presence of a conside- 

 rable number of spermatocytes in the 11th, 12th and 13th segments. 

 The presence of reproductive products and hence, necessarily, repro- 

 ductive organs in a parent stock composed of so few segments , and 

 upon which a more anterior development of a second stolon would 

 hardly be likely, should, I think give some indication as to the fate 

 of the so-called asexual individual. 



Stolonization in Autolytus ornaius consists in the separation of all 

 segments posterior to the 13th or 14th setigerous segment for the for- 



1 ri nóa&iT] = penis. 



2 Boll. Soc. di Naturalisti in Napoli. Ser. I. Vol. 7. 1893. Fase. 1. 



