. Annual report of the regents of the university of the state of New York on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. e Brachiopoda of this character, I propose the name Zygo- SPIRA*. GENUS ZYGOSPIRA (). Shells bivalve, equilateral, inequivalve : surfaces plicate in thetypical species; a sinus on the dorsal valve. Internal spires ar-rangejl somewhat as in Atrypa, with a broad loop passing fromthe outer limbs of the spiral band antirely across from side toside, near to or above the centre, and close to the inner sid
. Annual report of the regents of the university of the state of New York on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. e Brachiopoda of this character, I propose the name Zygo- SPIRA*. GENUS ZYGOSPIRA (). Shells bivalve, equilateral, inequivalve : surfaces plicate in thetypical species; a sinus on the dorsal valve. Internal spires ar-rangejl somewhat as in Atrypa, with a broad loop passing fromthe outer limbs of the spiral band antirely across from side toside, near to or above the centre, and close to the inner side of thedorsal valve. * Gr. C,vyog, jiigum; oneipa, spira. CONTRIBUTIONS TO PALEONTOLOGY. 155 The Atrypa modesta (loc. cit.) is the typical species of this genus, theinterior of which is shown in the accompanying illustrations. Both figuresare much enlarged : fig. 1 represents the dorsal valve removed, and showsthe loop as actually seen in the specimen, extending across the centres ofthe spires. Fig. 2 represents another specimen with the ventral valve re-moved, and the spires lying in the dorsal valve ; the loop being shown in theposition actually seen in this specimen*. Fia. 1. Fm.
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectscience, bookyear1853
