24 Venn. 
XV. VERMES. 
410. Zacharias, 0. Das Plankton des Arendsees. Forschber. Plon vii, 
pp. 50-58, and Biol. Centrbl. xix, pp. 95-102. 
411. -. Ueber die Yerschiedenkeit der Zusammensetzung des Winter- 
planktons in grossen und kleinen Seen. T. c. pp. 64—74. 
412. -. Zur Kenntnis des Planktons sachsiscker Fischteicke. T. c. 
pp. 78-95. 
413. -. Ueber einige biologiscke Unterschiede zwiscken Teicken und 
Seen. Biol. Centrbl. xix, pp. 313-317. 
414. -. Uber die Ursache der Versckiedenheit des Winterplanktons 
in grossen und kleinen Seen. Zool. Anz. xxii, pp. 19-13, and 25-31. 
415. Zimmer, C. Das tierische Plankton der Oder. Forsckber. Plon vii, 
pp. 1-14. 
Rotatorien, pp. 9-11. 
416. Zinn, W. Ueber Anguillula intestinalis. Centrbl. Bakter. xxvi, 
pp. 696-702, 1 Taf. 
417. Zschokke, F. Entozoen der aplacentalen Saugetiere. P. Congr. 
Zool. iv, pp. 203 & 204. 
418. -. Xeue Studien an Cestoden aplacentaler Saugethiere. Zeitsckr. 
wiss. Zool. lxv, pp. 404-445, Taf. xx & xxi. 
II. SUBJECT INDEX. 
VERMES . 
General Biology. 
Bibliography. Account of freshwater investigations with bibliography, 
Ward (390); Linstow (206); Matzdorff (242); Carus (69). 
Bipolar Theory. Vermes of Arctic and Antarctic Regions; Ortmann 
(290); D’Arcy W. Thompson (370). 
Breeding Periods ; C. Aurivillius (15); Coe (86); Lo Bianco (209); 
Thompson (371). 
Cell-lineage and Cleavage ; Treadwell (374); Lillie (202); Mead 
(245); Wilson (403). 
Comparative Cytology; Montgomery (264 & 266). 
Food-reserves in eggs; Loisel (211). 
Germ-layer theory ; Schultze, L. S. (344). 
Giant-fibres; Michel (259). 
Myelocytes; Chatin (79). 
Pain-reactions; Xorman (283). 
Parasitology. Parasites and Commensals of Crustacea; Richard (323) 
Symmetry and Asymmetry; Reh (321). 
Trochophore Theory. Bergh (34). 
ANNELIDA. 
GE PHY REA . 
General Biology. 
Anatomy and Histology of Thalassema neptuni Gaertner. Jameson 
(ne). 
Cytology. Protoplasmic structure in egg of Thalassema ; Wilson (402 
