. Annual report . 608 NEW YORK STATE MUSEUM. ing and bifurcating rapidly; in the greater part of the rhabdosome rigid,nearly straight, very closely arranged (about 12 to 14 in 10 ram) andextraordinarily regularly parallel. Width of branches .4 ram. Interspacesfrom one to one and a half times as wide as the branches. Dissepimentsvery slender, not exceeding .16 mm in width; mostly straight, a littlemore distant than the branches (about 1 mm) ; the resulting meshes hence shortly rectangular. Branches dividing at an acuteangle. Thecae not observed. Apertures apparentlyirregularly disposed, larger
. Annual report . 608 NEW YORK STATE MUSEUM. ing and bifurcating rapidly; in the greater part of the rhabdosome rigid,nearly straight, very closely arranged (about 12 to 14 in 10 ram) andextraordinarily regularly parallel. Width of branches .4 ram. Interspacesfrom one to one and a half times as wide as the branches. Dissepimentsvery slender, not exceeding .16 mm in width; mostly straight, a littlemore distant than the branches (about 1 mm) ; the resulting meshes hence shortly rectangular. Branches dividing at an acuteangle. Thecae not observed. Apertures apparentlyirregularly disposed, larger ones, approximately corres-ponding in number and position to the dissepiments,separated by more numerous smaller apertures. Position (did localities. Rare in the horizon withDiplograptus dent a t u s and Climaco-g r ap t u s \ a ntennarius at the Deep kill. Remarks. This form is evidently closely related ifnot identical with the species described by Dawson . d elica t u 1 n m , which name, being preoccupiedby a species name given by La
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