...In all the craniota it develops at an early stage in the horny plate; inthe amphioxus it seems to be converted into a wide cavity, the atrium, orperibranchial space... 
Ernst Haeckel 「The Evolution of Man」
...As a matter of fact, this atrium (commonlycalled the peribranchial cavity) is a secondary structure formed by thedevelopment of a couple of lateral mantle-folds or gill-covers(M1, U)...
Ernst Haeckel 「The Evolution of Man」
...Both sacs lie on the inner wall ofthe atrium, and have no special outlets...
Ernst Haeckel 「The Evolution of Man」
...Above the sexual glands, at the dorsal angle of the atrium, we find thekidneys...
Ernst Haeckel 「The Evolution of Man」
...The latter forms,like the simple atrium of the fish-heart, a pair of lateral dilatations, theauricles (Fig...
Ernst Haeckel 「The Evolution of Man」
...371 b); and the constriction between the atrium andventricle is called the auricular canal (Fig...
Ernst Haeckel 「The Evolution of Man」
...On July 19, 1614,three others were found in the atrium, in one of which wasthe sarcophagus of Claudia Hermione, the renowned pantomimist...
Rodolfo Lanciani 「Pagan and Christian Rome」
...The atrium or quadri-portico was entered by three gateways,the middle one of which had doors of bronze inlaidwith silver...
Rodolfo Lanciani 「Pagan and Christian Rome」
...The most important monument of the atrium, after thefountain, was the tomb of the emperor Otho II...
Rodolfo Lanciani 「Pagan and Christian Rome」
...The mausoleum, whichrose in the middle of the atrium of the old Flavian house,was discovered and destroyed towards the middle of thesixteenth century...
Rodolfo Lanciani 「Pagan and Christian Rome」
...If it is from thirty to forty feet,let half the width of the atrium be devoted to the tablinum...
Vitruvius 「Ten Books on Architecture」
...In theroof-opening let an aperture be left with a breadth of not less thanone fourth nor more than one third the width of the atrium, and with alength proportionate to that of the atrium...
Vitruvius 「Ten Books on Architecture」
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