74 Bulletin American Museum of Natural History [Vol. LIII 
We have been fortunate also in securing his collaboration in the matter 
of ecological notes on some of the more interesting species. Dr. James P. 
Chapin kindly furnished accounts of African birds feeding on mollusks, 
based on his extensive field work. 
We also wish to thank Dr. H. Schouteden, Curator of the Natural 
History Section of the Congo Museum at Tervueren, Belgium, for the 
opportunity of examining the collections in his care, thus enabling us to 
secure first-hand information on many rare and obscure forms. 
To Dr. Bryant Walker we are indebted for expert advice 
regarding the difficult family Ancylide. | 
The splendid photographs taken in the field, for the most part illus- 
trating the ecological chapters, are to be credited to Mr. Herbert Lang 
whenever not otherwise specified. For the privilege of here reproducing 
other photographs our gratitude is due to Professor Edmond Leplae, 
of the Department of Agriculture, Belgian Colonial Office, to Mr. Harry 
C. Raven, to Mr. Rudolph Grauer, and to Dr. Gilbert Grosvenor, Editor 
of the National Geographic Magazine, through whose courtesy permis- 
sion was granted for the use of pictures taken in Mt. Ruwenzori by Mr. 
Vittorio Sella. 
Finally, the authors are again glad to acknowledge the excellent work 
of Miss Helen Winchester upon the drawings and photographs of shells. 
New GENERA AND SUBGENERA, WITH THEIR [TYPE SPECIES 
Pafie 
Ajropomus: type: Ampullaria balanoided: Gould oe. ea 2h ee. 171 
Viwiparus section Rectiiviparus; type: Viviparus mweruensis E. A. Smith.... 209 
Lobogenes: type: L. michaelis, new species............... CS BED WORE ee Ra 224 
New Species, SUBSPECIES, AND MUTATIONS, WITH THEIR 
Typr LOCALITIES 3 
Planorias (Gyraiius)avghaibionsss., “Anak ower ees She aioe Soho es 127 
Burnupia kimiloloensis. Kimilolo River, Elisabethville.................... 153 
. CUO o -Asinntieo, Iniver. Blisacunvilles wees ee (15S 
mn eoumoruiond.. Lake Mawatdrat I ebabe. 6.6% oy a ce ee 154 
nS waned. Livelabe River at Kalenawe../ 0c, eck. el. «14 
Pilaicrag pia Ota ieyViles Sr ie een ie ene Perea ee ye 176 
COSCO NGORNSTE 1 AUIE VV ENG Whit ne es Pear Ces Grae aby iy he 177 
i" bie (QNUpIVOR | INOUWONG ANVers:.) So eo oe te 179 
Lanistes millestriatus. ie UO ee ee eet 188 
Sa COMpUeUS Irarernus,° Witshasa i Gia een fee «189 
“ nsendweensis katanganus. Little Lubembe River...........:...... 191 
(a9 
Ulieladomus): procerus longs. Stanloyville... =... occ cal... 197 
