On the North American Species of the Genus Agnostus
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One can distinguish upon its surface an internal groove, and an external ridge forming the contour, sometimes the limb is extended into small points on each side, as in A. Josepha. In the section Lsevigati the limb becomes obso- lete; in the section Limbati it is broad. The thorax has two segments in all the know^n species. The axis is usually well de- veloped in width, whereas the pleurae are often reduced; when the trilobation is distinct, as in A. Rex, the thorax shows the same characteristi...c; when it is faint, as in A. MuUs, the triloba- tion is also indistinct. The first segment is subdivided b}' a groove w^hich gives to the pleurae two bands more or less elevated, the anterior band being the larger; the second segment has the pleurae on each side divided into bands of equal width; the points of each pleura? are directed forward. The pygidium con- forms to the head. In certain species, for example A. HilmUatus^ the pygidium is marked with dorsal grooves; but the head show& no trace of these grooves.
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To quickly assess the difficulty of the text, read a short excerpt:
One can distinguish upon its surface an internal groove, and an external ridge forming the contour, sometimes the limb is extended into small points on each side, as in A. Josepha. In the section Lsevigati the limb becomes obso- lete; in the section Limbati it is broad. The thorax has two segments in all the know^n species. The axis is usually well de- veloped in width, whereas the pleurae are often reduced; when the trilobation is distinct, as in A. Rex, the thorax shows the same characteristi...c; when it is faint, as in A. MuUs, the triloba- tion is also indistinct. The first segment is subdivided b}' a groove w^hich gives to the pleurae two bands more or less elevated, the anterior band being the larger; the second segment has the pleurae on each side divided into bands of equal width; the points of each pleura? are directed forward. The pygidium con- forms to the head. In certain species, for example A. HilmUatus^ the pygidium is marked with dorsal grooves; but the head show& no trace of these grooves.
What to read after On the North American Species of the Genus Agnostus?
You can find similar books in the "Read Also" column, or choose other free books by Anthony Wayne Vogdes to read onlineMoreLess
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