See _Studies on the Arthurian Legend_ by Professor Rhys; _The Legend of Sir Lancelot_, Grimm Library, xii., Jessie L. Weston; _Der Karrenritter_, ed. Professor Foerster. (J. L. W.) GUENON (from the French, = one who grimaces, hence an ape), the name applied by naturalists to the monkeys of the African genus _Cercopithecus_, the Ethiopian representative of the Asiatic macaques, from which they differ by the absence of a posterior heel to the last molar in the lower jaw. GUERET, a town of central France, capital of the department of Creuse, situated on a mountain declivity 48 m. N.E. of Limoges on the Orleans railway. Pop. (1906), town, 6042; commune (including troops, &c.), 8058. Apart from the Hotel des Monneyroux (used as prefecture), a picturesque mansion of the 15th and 16th centuries, with mansard roofs and mullioned windows, Gueret has little architectural interest. It is the seat of a prefect and a court of assizes, and has a tribunal of first instance, a chamber of commerce and lycees and training colleges, for both sexes. The industries include brewing, saw-milling, leather-making and the manufacture of basket-work and wooden shoes, and there is trade in agricultural produce and cattle. Gueret grew up round an abbey founded in the 7th century, and in later times became the capital of the district of Marche. GUEREZA, the native name of a long-tailed, black and white Abyssinian monkey, _Colobus guereza_ (or _C. abyssinicus_), characterized by the white hairs forming a long pendent mantle. Other east African monkeys with a similar type of colouring, which, together with the wholly black west African _C. satanas_, collectively constitute the subgenus _Guereza_, may be included under the same title; and the name may be further extended to embrace all the African thumbless monkeys of the genus _Colobus_. These monkeys are the African representatives of the Indo-Malay langurs (_Semnopithecus_), with which they agree in their slender build, long limbs and tail, and complex stomachs, although differing by the rudimentary thumb. The members of the subgenus _Guereza_ present a transition from a wholly black animal (_C. satanas_) to one (_C. caudatus_) in which the sides of the face are white, and the whole flanks, as well as the tail, clothed with a long fringe of pure white hairs.