12 Crust . 
X. Crustacea. 
[1920] 
Verhoeff, K. W. Zur Kenntnis der 
Entwickelung der Trachealsysteme 
und der Untergattungen von Porcellio 
und Trecheoniscus. (Uber Isopoden, 
22, Aufsatz.) Berlin SitzBer. Ges. 
natf. Freunde 1917 1917 (195-223) 
text-figs. 199 
Verhoeff, K. W. Zur Kenntnis 
der Larven, des Brutsackes und der 
Bruten der Oniscoidea. (28 Isopoden - 
Aufsatz.) Zool. Anz. Leipzig 51 1920 
(169-189). 200 
Verhoeff, K. W. Zur Geographisch- 
biologischen Beurteilung der Land- 
Isopoden. (29. Isopoden- Aufsatz.) 
Zool. Anz. Leipzig 52 1920 (20-31). 201 
Verne, J. Sur la nature du pigment 
rouge des crustac6s. Paris C. It. soo. 
biol. 83 1920(963-964). 202 
Verne, J. Sur l’oxydation du carotene 
des Crustac^s et sur la presence parmi 
les produits d’oxydation d’un corps 
ayant les reactions d’une cholest6rine. 
Paris C. R. soc. biol. 83 1920 (988-990). 
203 
Verne, J. Etude histochimique de 
la formation de la m61anine chez les 
crustac&a. Paris C. R. soc. biol. 83 
1920 (760-762). 204 
Voeltzkow, A. Flora und Fauna der 
Comoren. In Voeltzkow, Reise in 
Ostafrika in den Jahren 1903-1905 
Wiss. Ergeb. 3 1917 (478). 205 
Wenz, W. vide Fischer, K. 
Willey, A. Report on the Marine 
Copepoda collected during the Canadian 
Arctic Expedition. Rep. Canad. Arct. 
Exp. 1913-18 7 pt. K 1920 (46 pp.). 
206 
Wilson, C. B. The Copepod Parasites 
[of Lake Maxinkuckee.] Brookville 
Ind. Proc. Acad. Sci. 1918 1919 (230- 
231). 207 
Wilson, C. B. Parasitio Copepods 
from the Congo Basin. New York N.Y. 
Bui. Amer. Mus. Nat. Hist. 43 1920 (1-8) 
pis. i-iii. 208 
Wilson, C. B. Argulidae from the 
Shuben Acadie river, Nova Scotia. 
Ottawa Canad. Field Naturalist 34 
1920 (149-151) text-figs. 209 
Wilson, C. B. Report on the parasitic 
Copepoda collected during the Canadian 
Arctic Expedition, 1913-1918. Rep. 
Canad. Arct. Exped. 1913-18 7 Pt. L 
1920 (16 pp.). 210 
Wilson, C. B. A new species of 
Parasitio Copepod, with notes on 
species already described. Washington 
D.C. Smithsonian Inst. Nation. Mus. 
Proc. 55 1920 (313-316) pi. xxi. 211 
Wilson, C. B. North American 
parasitic Copepods belonging to the 
new family Sphyriidae. Washington 
D.C. Smithsonian Inst. Nation. Mus. 
Proc. 55 1920 (549-604) pis. 1-lix. 212 
Withers, T. H. The Cirripede genus 
Stramentum (Loricula) : its history 
and structure. Ann. Mag. Nat. Hist. 
London ser. 9 5 1920 (65-84) pis. iii-iv. 
213 
Withers, T. H. The cirripede sub- 
genus Scillaelepas ; its probable oc- 
currence in the Jurassic rocks ( 8 . 
gaveyi, sp. n.). Ann. Mag. Nat. Hist. 
London ser. 9 5 1920 (258-264) pi. xiii. 
214 
Woltereck, R. Variation und Art- 
bildung. Analytische und Experi- 
mentelleUntersuchungen an Pelagischen 
Daphniden und anderen Cladoceren. 
Intern. Rev. Hydrobiol. 9 1920 (1-151) 
pis. i-vi. 215 
Wright, Mabel C. Limnestheria ; a 
new chonchostracan genus from the 
Kilkenny coal-measures. Dublin Proc. 
R. Irish Acad. 35 Sect. B 1920 (187- 
204) pis. xiv-xv text-figs. 216 
Wundsch, H. H. Weitere Fundorte 
der Susswasserform von Corophium 
curvispinum G. O. Sars in der Baltischen 
Tiefebene. Arch, hydrobiol. Stuttgart 
12 1919 (693-697). 217 
Zirpolo, D. Notizia sulla biologia 
della Maja squinado Bose. Milano 
Natura riv. sci. nat. 11 1920 (65-67) 
text-fig. 218 
II.— SUBJECT INDEX. 
N.B. — The numbers in Clarendon type 
refer to the list of Titles , except 
when they indicate a Volume. 
GENERAL. 2603 
General Treatises. 
Alcock, 3. 
