LIST OF ILLUSTRATIONS 
PLATES 
I.—Macrobrachium faot, from Stanleyville; Parapeneopsis atlantica, from Banana. 
11.—Macrobrachium luje: from Stanleyville; immature male and large female. 
I1I.—Macrobrachium luje: from Stanleyville; large female and small male and female. 
IV.—Macrobrachium luje, from Aba; Macrobrachium duz, from Niapu. 
V.—Macrobrachium dux: large male from Avakubi and immature male from Niapu. 
VL—Macrobrachium dux: from Avakubi; ovigerous female and immature male. 
Macrobrachium vollenhovenit: from Malela, male. 
VIl.—Macrobrachium vollenhovenit: large male and ovigerous female. 
VIII.—Usual habitat of Upogebia furcata, at Banana, and Upogebia furcata, male and 
female. 
1X.—Habitat of Clibanarius africanus and Clibanarius cooki, at Banana, and speci- 
men of each. 
X.—Neritina glabrate: color variations from a colony at San Antonio. 
XI.—Lymnxa natalensis undussume; Lymnxa natalensis; Physopsis africana; 
Physopsis africana globosa; Bulinus forskali1; Planorbis sudanicus tanganytkanus. 
XII.—Burnupia transvaalensis; Burnupia kimiloloensis, type; Burnupia caffer; 
Burnupia edwardiana, type; Burnupia alta, type; ‘‘Ancylus”’ tanganyicensis; 
Burnupia walkert, type. 
XIII.—Neritina adansoniana; Neritina oweniana. 
XIV.—Pila leopoldvillensis; Saulea vitrea; Afropomus balanoideus; Lanistes graueri; 
Pila leopoldvillensts. 
XV.—Pila congoensis amplior, type and immature paratype; Pla congoensis, type 
and immature paratype; Pila microglypta, type and immature paratype. 
XVI.—Head dress of Pila congoensis, worn by a man of the Bangba tribe at Niangara. 
XVII.—Lanistes procerus langi, type; Lanistes adansont; Lanzstes ellipticus. 
XVIII.—Lanistes bicarinatus; Lanistes intortus; Lanistes millestriatus, type; Lanistes 
nsendweensis; Lanistes nsendweensis katanganus, type; Lamnistes congicus; 
Lanistes congicus fraternus, type. 
XIX.—Viviparus unicolor; Neothauma tanganyicense var. bridouxianum; Neothauma 
tanganyicense; Neothauma tanganyicense var. bicardinatum; Neothauma tan- 
ganyicense; Viviparus mweruensis; Viviparus mweruensis pagodiformis; Prla 
congoensis; Pila congoensis amplior. 
XX.—Potamides fuscatus; Potamides fuscatus form radula; Potamides graptoconus, 
type and paratype; Potamides schoutedent, type and paratype. 
XXI.—Melanoides tuberculata; Melanoides anomala, type; Melanoides anomala 
bukamana, type; Melanoides liebrechisi; Melanoides kisangani, type and para- 
type; Melanoides kisangani congo, type and paratype. 
XXIT.—Melanoides langi, type and paratype; Melanoides lang: zambiensis, type; 
Melanoides depravata; Melanoides nsendweensis megalobasis; Melanoides nsend- 
weensts consobrina; Melanoides nsendweensis megalobasis, type; Melanoides 
nsendweensis soror, topotype; Melanoides wagenia, type; Melanoides wagenia 
tshopoicola, type and paratype; Melanoides bavayi; Melanoides crawshayi; 
Melanoides mweruensis; Melanoides nyangweensis. 
XXIII.—Pachymelania aurita; Pachymelania fusca. 
XXIV.—Pachymelania fusca. 
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