x Illustrations 
LVII.—Foothills of Mt. Ruwenzori in Uganda. 
LVIII.—Subalpine zone of Mt. Ruwenzori on the eastern slope. 
LIX.—Alpine or paramos zone of Mt. Ruwenzori in the Upper Mobuku Valley. 
LX.—Mountain rain forest northwest of Lake Tanganyika, in 1,800 to 2,500 m. 
altitude; bamboo forest in the pass between Mt. Sabinyo and Mt. Mgahinga, 
north of Lake Kivu, in 2,700 m. altitude. 
LXI.—Savanna forest (Brachystegia formation) of Upper Katanga, near Elizabeth- 
ville. 
LXII.—Papyrus swamp near the source of the Duru River, east of Yakuluku, October 
1911, and pool of stagnant water on granitic rock near Yakuluku, October, 
1911. 
LXIIJ.—Mixed swamp and pond in the savanna near Vankerckhovenville, April, 
1912. 
LXIV.—Stagnant pools near the shore of the Congo River, Stanley Falls, at low water 
August, 1909; falls on the Tshopo River near Stanleyville, March, 1915. 
LXV.—Forest brook near Niapu, Ituri District, November, 1913. 
LXVI.—Rapids on the Aruwimi River at Panga, September, 1914. 
LXVII.—Garamba River north of Faradje, at high water, September, 1911; at 
low water, February, 19138. Type locality of Mutela garambe and Celatura 
mesafricana. 
LXVIII.—Dungu River, at Faradje, March, 1910. Habitat of Parreysia leopold- 
villensis and Aspatharia sinuata. 
LXIX.—Semliki River near Beni and falls of the Lubumbashi River hear Elizabeth- 
ville. 
LXX.—Bay of Mufumbi on Lake Tanganyika and outflow of the Lukuga River, 
Lake Tanganyika. 
LXXI.—Sand-bank in the branch of the Congo River at Zambi and accumulations 
of dead valves of Egeria congica from the banks of an island near Malela. 
LX XII.—Mud-banks in branch of Congo River, between Zambi and Malela; type 
locality of Melanoides langi zambiensis. 
LXXIII.—Outside view of mangrove forest (Rhizophora Mangle) fringed with Raphia 
palms, in the estuary of the Congo River near Malela, July, 1915. 
LXXIV.—Inside view of mangrove forest (Rhizophora Mangle), in the estuary of the 
Congo River, near Malela, at low tide, July, 1915. 
LXXV.—Creek on the Congo estuary near Kunga, at high tide and low tide. 
LXXVI.—Colony of Pachymelania fusca in the estuary of the Congo at Kunga; 
Potamides fuscatus inhabited by hermit crabs on the shore of Banana Creek, in 
the estuary of the Congo River. 
LXXVII.—Colony of Potamides fuscatus on Bulabemba Island near Banana, in the 
estuary of the Congo River. 
Text Fiaqures 
PaGE 
Candie togoenas irom Statleyvillé: 222.2050. ,24 ee 14 
Caridina togoensis: from Stanleyville............. Pea ee me os EG 
Crangon lang1, new species: from Baa: male boinne: eee eS oo 21 
Palzemon squilla: from St. Paul de Losndas ovigerqus female: 02) 6 oe. 24 
Palzmon masculatus 
