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 LIPSANOCYSTIS TRAVERSENSIS, A NEW CYSTID FROM THE DEVONIAN OF MICHIGAN

G. M. EHLERS AND J. B. LEIGHLY

In the Museum of Geology of the University of Michigan there was recently found a cystid with a label, in Dr. Carl Rominger's handwriting, bearing the name Lepadocrinus hamiltonensis Rominger, and indicating that the specimen was collected at Partridge Point, Thunder Bay, Michigan. This cystid is probably the one that Rominger had in mind when he recorded the occurrence of the genus Lepadocrinus along with several genera and species of corals, echinoderms, bryozoa, brachiopods, and trilobites in the rocks of Partridge Point, which he regarded as belonging to the Hamilton group. No description, however, of this cystid, or of the species Lepadocrinus hamiltonensis Rominger, occurs in the literature. It seems very probable that Rominger, after recording this occurrence of Lepadocrinus, thought the cystid to be a new species, labeling it Lepadocrinus hamiltonsis, never publishing a description of it.

Upon examination, it became evident that this cystid did not belong to the genus Lepadocrinus.(=Lepocrinites), but to an undescribed genus, for which the name Lipsanocystis proposed.

Class CYSTOIDEA Order Family CALLOCYSTIDAE Subfamily Apiocystinae

Lipsanocystis, n. gen. Definition.—Apiocystinae with 20 plates, arranged as follows:

Plates, 4, 1, 2, 3, in basal row;

Plates 3, 6: 7, 8, 9, in second row: 155