4 Verm. 
VERMES. 
Bergendal, D. Studien ueber nordische Turbellarien und Nemertinen. 
CEfv. Ak. Forh. 1890, pp. 323-328. 
A preliminary note. A new Triclad. 
Bergh, It. S. (l)Die Schichtenbildung im Keimstreifen der Blutegel. 
Zool. Anz. xiii, pp. 658-660. 
. (2) Neue Beitrage zur Embryologie der Regenwiirmer. T. c. 
pp. 186-190. 
A preliminary notice. The author criticizes many of E. B. Wilson’s 
conclusions. He strongly supports the view he published in 1885, that 
in Annelids the mesoderm and ectoderm are closely bound together, so 
that the mosoderm must bo taken as of ectodermal origin. 
. (3) Neue Beitrage zur Embryologie der Anneliden. I. Zur 
Entwicklung und Differenziruug des Keimstreifens von Lumbricus. 
Z. wiss. Zool. 1, pp. 469-526, pis. xix-xxi. 
An elaborate paper on the germinal layers in Lumbricus. 
Blanchard, It. (1) Anomalie des Organes G&ritaux chez un Taenia, 
saginata , Goeze. Bull. Soc. Z. Fr. xv, pp. 166-168, with woodcut. 
. (2) Anomalie des Organes Gdnitaux chez un Taenia saginata , Goeze. 
C.R. Soc. Biol. 1890, pp. 403-404. 
An abnormality due to the fusion of two or more segments. 
Boehmig, L. Untersuchungen ueber Rhabdocoele Turbellarien. n. Pla- 
giostomina und Cylindrostomina, Graff. Z. wiss. Zool. ii, pp. 167-479, 
pis. xii-xxi, 21 woodcuts. 
An elaborate monograph on the Bhabdoccela. Anatomy, pp. 171-346. 
Special descriptive part, pp. 346-464. Systematic, pp. 464-470. 
Plagiostomina 
1. Genus Plagiostoma. 
Plagiostomina without a tentacle at anterior end. 
2. Vorticeros. 
Plagiostomina with two tentacles at the cephalic end of 
the body. 
A llostomina. 
1. Alio stoma. 
A llostomina v with a "circular furrow, with long cilia 
about the brain. 
2. Enterostoma. 
Allostomina without special cilia or furrow. 
Cylindrostomina. 
1. Cylindro stoma. 
Cylindrostomina , with cylindrical forwardly-directed 
pharynx. The small penis is similarly directed ; the 
atrium runs beneath the gullet, and both form a short 
common external opening. 
