(16) The Balolo group consists of all the languages of the Northern Congo bend (bounded on the north, east and west by the main stream of the Congo), and perhaps the corrupt dialects of the Northern Kasai, Kwilu and Kwango (Babuma, Bahuana, Bambala, Ba-yaka, Bakutu, &c.), where these are not nearer allied to Teke (No. 18) or to Bakuba.
(17) The Bangala-Bobangi-Liboko group comprises the commercial languages of the Upper Congo (Ngala, Bangi, Liboko, Poto, Ngombe, Yanzi, &c.) and all the known Congo dialects along and to the north and sometimes south of the main stream, from as far west as the junction of the Sanga to as far east as the Rubi and Lomami rivers, and those between the Congo and the Lower Ubangi river and up the Ubangi, as far north as the limits of the Bantu domain (about 3° 30′ N.). Allied to these perhaps are the scarcely-known forms of speech in the basin of the Sanga river, besides the "Ba-yanzi" dialects of Lakes Mantumba and Leopold II.
(18) The Bateke (Batio) group. This may be taken roughly to include most of the Bantu dialects west of the Sanga river, northwest of the Lower Congo, south of the Upper Ogowe and Ngoko rivers and east of the Atlantic coast-lands.
(19) The Di-Kele and Benga dialects of Spanish Guinea and the Batanga coast of German Cameroon.
(20) The Fañ or Pangwe forms of speech (so corrupt as to be only just recognizable as Bantu), which occupy the little-known interior of German Cameroon and French Gabun, down to the Ogowe, and as far east and north as the Sañga, Sanagá and Mbam rivers, and the immediate hinterland of the "Duala" Cameroon.
(21) The Duala group, which on the other hand is of a much purer Bantu type, includes the languages spoken on the estuary and delta of the Cameroon river.
(22) The Isubu-Bakwiri group of the coast-lands north of Cameroon delta (Ambas Bay), and on the west slopes of Cameroon Mts.
(23) The Bantu dialects of Fernando Pô (Ediya, Bateti, Bani, &c.) distantly allied to Nos 24, 2 and 13.
(24) The Barondo-Bakundu group, which begins on the north at the Rio del Rey on the extremity of the Bantu field, near the estuary of the Cross river. This group may also include Barombi and Basā, Boñkeñ, Abo, Nkosi and other much-debased dialects, which are spoken on the eastern slopes of the Cameroon mountains and on the Cameroon river (Magombe), and thence to the Sanagá and Nyong rivers. Eastwards and north-eastwards of this group, the languages (such as Mbe, Bati, Nki, Mbudikum, Bafut, Bayoñ) may be described as "semi-Bantu," and evincing affinities with the forms of speech in the basin of the Central Benue river and also with the Fañ (No. 20).
(25) Turning southwards again from the north-westernmost limit of the Bantu, we meet with another group, the Mpongwe-Orungu and Aduma languages of French Gabun, and the tongues of the Lower Ogowe and Fernan Vaz promontory.