15 Verm. 
Subject Index. — Platyhelminthia, 
Wehrle, L. P. vide IVcIch, P. S. 
Weimer, B. R. Thigmotactio 
reactions of the fresh-waterTurbellarian, 
Phagocata gracilis, Leidy. Decatur 
III. Trans. Anier. Microso. Soc. 37 
1918 (111-124) pi. xi. 283 
Welch, P. S. Further studies on 
North American Mesenchytraeids 
(Oligochaeta). Decatur 111. Trans. 
Amer. Microsc. Soc. 38 1919 (175-188) 
pi. xvii. 284 
Welch, P. S. and Wehrle, L. P. 
Observations on reproduction in certain 
parthenogenetic and bisexual Nema- 
todes reared in artificial media. De- 
catur. 111. Trans. Amer. Microsc. Soc. 
371918(141-176). 285 
Wesenberg-Lnnd, C. Fures 0 studier. 
En bathymetrisk-botanisk-zoologisk 
Undersogelse af Molleaaens Seer. 
Kjcbenhavn K. Danske Selsk. Skrift 
ser. 8 3 1917-1919 (1-208) 8 pis. 286 
Wharton, L. D. Notes on Nematode 
parasites of Philippine birds. Te- 
trameres fissipina (Diesing, 1860) in 
Philippine chickens. Philippine J. 
Sci. Manila Sect. D 13 1918 (219-221). 
287 
Whitehouse, R. H. Indian land 
Planarians. Rec. Ind. Mus. Calcutta 
16 1919 (29-40) pi. xi. 288 
Whitney, 1). D. The relative in- 
flucnco of food and oxygen in con- 
trolling sex in Rotifers. J. exp. Zool. 
Philadelphia 24 1917 (101-138). 289 
Whitney, D. The ineffectiveness of 
oxygen as a factor in causing male 
production in Hydatina senta. J. exp. 
Zool. Philadelphia 28 1919 (469-492). 
290 
Wibaut, N. Raderdieren uit bet 
planton der Amsterdamsche grachten 
[Radertiere aus dem Plankton der 
Amsterdamer Graben.] Amsterdam 
Bydr. Dierk. 21 1919 (161-159). 291 
Williamson, H. 0. The distribution 
of parasite-infected fish. Ann. Applied 
Biol. Cambridge 6 1919 (48-62). 292 
Wislooki, G. B. Observations on 
Dioctophyme renalc in dogs. J. Para- 
sitol. Urbana 6 1919 (94-97). 293 
Wrench, G. T. Studies in ankylos- 
tomiasis. No. IV. Calcutta Ind. J. 
Med. Res. 7 1919 (476-477). 294 
1203 
Yorke, W. and Macfie, J. W. Slron- 
gijlidae in horses. VI. Cylkostomum 
pseudo-cafinaium sp. n. Ann. trop. 
Med. Parasitol. Liverpool 12 1919 
(273-278). 295 
Yorke, W, and Macfie, J. W. Stron- 
gylidae in horses. VII. Cylicostomum 
pateratum sp. n. Ann. trop. Med. 
Parasitol. Liverpool 13 1919 (67-62). 
296 
Yorke, W. and Macfie, J. W. Stron- 
gylidae in horses. VIII. Species found 
in American horses. Ann. trop. Mod. 
Parasitol. Liverpool 18 1919 (137-148) 
pis. iv-vi, 297 
Yoshida, S. On the development of 
Ascaris lumbricoides L. J. Parasitol. 
Urbana 5 1919 (106-116) 1 pi. 298 
Yoshida, S. On the migrating course 
of Ascarid larvae in the body of the 
host. .J. Parasitol. Urbana 6 1919 
(19-27). 299 
Young, R. T. The degeneration of 
yolk glands and cells in Cestodes. 
Biol. Bull. Wood’s Hole 36 1919 (309- 
311). 300 
Young, R. T. Association of somatic 
and germ cells in Cestodes. Biol. 
Bull. Wood’s Hole 36 1919 (312-314). 
301 
PLATYHELMINTHIA, 
NEMERTINEA, 
MESOZOA. 
SUBJECT INDEX. 
COMPREHENSIVE AND GENERAL. 
1203 
Bibliography. 
Boulenger, 24; Dunkerly, 63. 
Books, Reviews. 
Chandler, 36. 
Controversial. 
Janicki, 126. 
