[1921] 
VIII. Mollusca. 
Moll 3 
22. — Bacchus, D. Pyramidula 
rotundata var. alba at Brislington, 
Somerset. N. J. Conch. Leeds 16 1921 
p. 165. 
23. — Bacchus, D. Milax gagates in 
Gloucester West. J. Conch. Leeds 16 
1921 p. 167. 
24. — Bacchus, D. Polita rogersi in 
Leigh Woods, Somerset. N. J. Conch. 
Leeds 16 1921 p. 235. 
. Baden, K. See No. 21. 
25. — Baker, F. C. New forms of 
Pleistocene mollusks from Illinois. 
Nautilus Boston Mass. 35 1921 pp. 22- 
24. 
26. — Baker, F. C. Preparing collec- 
tions of the mollusca for exhibition and 
study. Trans. Amer. Microsc. Soc. 
Menasha Wis. 40 1921 pp. 31-46. 
27. — Baker, F. C. Pleistocene 
mollusca from Indiana and Ohio. 
J. Geol. Chicago 111. 28 1920 pp. 439- 
457. 
28. — Barbiche and Kieffer, J. J. 
Catalogue des mollusques vivants du 
D6partement de la Moselle. Bui. soc. 
hist. nat. Metz 19 1921 pp. 7-36. 
29. — Barbieri, N. A. fltude anato- 
mique sur la terminaison ar6tinienne du 
nerf optique dans la serie animale. 
C.R. Acad. Sci. Paris 172 1921 pp. 1376- 
1379. 
30. — B&rdarson, G. Sse-linirid^r 
nyf undin vid Island. Skyrsla Natturuf. 
Reykjavik 1919 and 1920 1921 pp. 42- 
47. 
31. — B&rdason, G. G. Fossile 
Skalaflej ringer ved Breidifjordur i 
Vest-Island. Geol. For. Forh. Stock- 
holm 43 1921 pp. 323-380. 
32. — Barnett, V. H. Geology of the 
Hound Creek District of the Great Falls 
coal field^, Cascade County, Montana. 
Bui. U.S. Geol. Surv. Washington No. 
641-H 1916 pp. 215-231. 
32a. — Barthoux, J. L’fiocene des 
environs de Suez. Compte-Rendu Soc. 
Geol. France Paris 1920 1920 pp. 104-5. 
33. — Bartsch, P. A new classification 
of the shipworms and descriptions of 
some new wood boring mollusks. Proc. 
Biol. Soc. Washington 34 1921 pp. 25-32. 
(n-17041 r) Q 
34. — Bartsch, P. New marine 
mollusks from the West Coast of 
America. Proc. Biol. Soc. Washington 
34 1921 pp. 34-40. 
35. — Bartsch, P. The land mollusks 
of the genus Obba from the Islands of 
BdIioI and Panglao. P. I. J. Washing- 
ton Acad. Sci. 8 1918 pp. 16-17. 
36. — Bartsch, P. A key to the 
Philippine subspecies of Obba marginata 
with notes on their distribution. 
J. Washington Acad. Sci. 8 1918 pp. 60- 
63. 
37. — Bartsch, P. The land shells of 
the genus Amphidromus from the 
islands of the Palawan Passage. J. 
Washington Acad. Sci. 8 1918 pp. 361- 
367. 
38. — Bartsch, P. A key to the sub- 
species of Leptopoma nitidum Sowerby 
of the Philippine Islands. J. Washing- 
ton Acad. Sci. 8 pp. 532-536. 
39. — Bartsch, P. Classification of the 
Philippine operculate land shells of the 
family Helicinidae with a synopsis of 
the species and subspecies of the genus 
Geophorus. J. Washington Acad. Sci. 
8 1918 pp. 643-657. 
40. — Bartsch, P. The Caecidae and 
other marine mollusks from the north- 
west coast of America. J. Washington 
Acad. Sci. 10 1920 pp. 565-572. 
41. — Bataillon, C. Spermies couplees 
et heterochromosome dans la lignee 
typique d’une Turritelle. C. R. soc. 
biol. Paris 84 1921 pp. 219-222. 
42. — Baumberger, F. Ueber das Alter 
des Vaulroz- und Ralligschichten. 
Eclogae Geol. Helvet. Lausanne 16 
1920 pp. 137-8. 
43. — Bavay, A. Sables littoraux des 
lies de Loos (Guin6e fran 9 aise). Des- 
cription d’une espfece nouvelle du genre 
Pedipes. Bui. Mus. Hist. Nat. Paris 
1920 1920 pp. 638-639. 
44. — Beeston, H. The non-marine 
mollusca of Llandudno and district. 
J. Conch. Leeds 16 1921 pp. 138-144. 
Begemann, H. vide Jordan, H. J. 
45. — Bell, A. British oysters : past 
and present. Essex Nat. Stratford 19 
1920-1921 pp. 209-221 pis. xvii-xviii 
[Continued.] 
a 11—2 
