. 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. pygidium with spines, the axis narrow; five articulations besides the ter-minal ones; the lateral lobes with four or five annulations, and the anteriorridge terminating in a border; the anterior margin curved and extended ina spine. Arionellus bipunctatus. Fig. 50. Glabella and fixed cheeks, twice enlarged : from Root river.«• 51. A cheek, twice enlarged : from Lawrence creek. Ill^nurus quadratus. Fig.
. 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. pygidium with spines, the axis narrow; five articulations besides the ter-minal ones; the lateral lobes with four or five annulations, and the anteriorridge terminating in a border; the anterior margin curved and extended ina spine. Arionellus bipunctatus. Fig. 50. Glabella and fixed cheeks, twice enlarged : from Root river.«• 51. A cheek, twice enlarged : from Lawrence creek. Ill^nurus quadratus. Fig. 52. A glabella.«? 53,54. Cheeks of dififerent individuals.•« 55. A thoracic 56. A pygidium.•« 57. A larger glabella. CONOCEPHALITES NACTUS ( n. S.). Fig. 58. A small species with ovate conical glabella which is marked by three distinctpairs of furrows, the posterior ones of which extend obliquely backwardnearly to the occipital furrow. It is somewhat larger and less prominentthan C. minor, with a narrow occipital ring without spine. It occurs in thelower beds of the sandstone near the mouth of Black river, Wisconsin. S.^ ?^:^mmMML m^mm^Tmmm,
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectscience, bookyear1853
