21 Moll. 
St’BJEOT Index. — General. 
2203 
Vredenburg, E. Two Albino Varietieg 
of Cyproea erosa Linnaeus. Calcutta 
J. As. Soc. Bong. 16 1919 (143-146). 
393 
Vredenburg, E. The occurrence of 
Cyprcea piriformis Gray in the Mergui 
Archipelago. Calcutta J. As. Soc. Bong. 
15 1919 (147). 394 
Vredenburg, E. W. Observations on 
the shells of the Family Doliidce. 
Calcutta Mem. Ind. Mus. 7 1919 (145- 
190) pis. ii-viii. 395 
Walker, B. Notes on certain Philip- 
pine species of Viviparus Nautilus 
Boston Mass. 32 1919 (109-124) pis. 
viii & ix. 396 
Walker, H. A new species of Campto- 
ceras. Ann. Arbor Mich. Occ. Pprs. 
Mus. Zool. 641919(l-6)pl. i. 397 
Walker, B. New species of Amnicola 
from Guatemala. Ann. Arbor Mich. 
Occ. Pprs, Mus. Zool. 73 1919 (1-4) 
pi. i. . 398 
Walker, B. Notes on North American 
Naiades. II. Ann. Arbor Mich. Occ. 
Pprs. Mus. Zool. 74 1919 (1-8) pis. i-ii. 
399 
Walker, B. Notes on North American 
Naiades. I. Ann. Arbor Mich. Occ. 
Pprs. Mus. Zool. 49 1918 (1-6). 400 
Watson, , H. Notes on Hygromia 
limhata Drap. London Proc. Malac. 
Soo. 13 1919 (120-132) pis. ii-iii. 401 
Webster, W. T. Notes on the red 
variety of Planorbis corneus, L., and 
some other freshwater mollusca. London 
Proc. Malac. Soc. 13 1919 (86-88). 402 
Weisfermel, W. vide Bohm, J. 
Whittaker, E. J. Notes on variation 
in Planorbis campanulatus Say, from 
Blue Sea Lake, Quebec. Nautilus 
Boston Mass. 32 1919 (127-134) pi. x. 
403 
Willett, G. Mollusca of Forrester 
Island, Alaska Univalves (continued 
from page 69). Nautilus Boston Mass. 
33 1919 (21-28). 404 
Williams. M. Y. The Silurian geology 
and faunas of Ontario Peninsula and 
Manitoulin and adjacent islands. 
Canada Dept. Mines Geol. Serv. Mem. 
Ill 1919 (1-193) pis. i-xxxiv. 405 
Wiman, C, Remarques sur le cr6tac6 
Belemnitella mucronata dans la 
Scanio. Upsala Bull. geol. Inst. 16 
1919 (305-316). 406 
Winslow, M. L. Pleurobema clava 
(Lam.) and Planorbis dilatatus buchan- 
ensis (Lea) in Michigan. Ann. Arbor 
Mich. Occ. Pprs. Mus. Zool. 61 1918 
(1-4). 407 
Woodruff e-Peacock, T. W. Vertigo 
pygmaea Drap. Naturalist London 
1919 1919 (245). 408 
Woodward, B. B. vide Kennard, 
A. S. 
Wurtemberg, W. J. Helix kortensis. 
Nautilus Boston Mass. 33 1919 (71). 
409 
Wybergh, \V. The coastal Lime- 
stones of the Cape Province. Tr^'-^s. 
Geol. Soc. South Africa 22 1919 (46- 
67). 410 
Zirpolo, G. Micrococcus pierontonii. 
Nuova specie di batterio fotogeno dell’ 
organo lumino.so di Rondeletia minor 
Naef. Napoli Bol. Soc. nat. 31 1919 
(75-87). . 411 
II. SUBJECT INDEX. 
N.B.—TAe number in Clarendon Type 
quoted after the author's name, in 
both the Subject and Systematic 
Indices, refers to “ Titles," where 
the fuller reference will be found. 
GENERAL. 2203 
Historical. 
Cayeux, 61. 
Biography. 
[Anon.] 16 & 17 ; Ferriss, 143 ,* 
Henderson, 198 ; Johnson, 219 ; Mel- 
viU, 270; Taylor, 373. 
Bibliography. 
[Anon] 16 & 17 ; Caiman, 57 ; 
Fossa-Mancini, 154 ; Harmer, 190 ; 
Isnard, 213 ; Kennard & Woodward, 
230 ; Fallary, 307 ; Parona, 310 ; 
Reynell, 331 & 332. 
General Treatises and Mono- 
graphs. 
Cossmann, 98 ; Hesse, 203 & 204 ; 
Ortmann, 304. 
