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SUPPLEMENT a NOTICE of FOSSIL CBWGTAOEA. By JEL VAN RENSSELAER, M. D. Read hnuary 24, 1825.

IN a short notice which I had the honour to read to the Lyceum a few weeks ago, mention was made,-in a note, of part of a fossil crab in the possession of Major Delafield, that could not be found. I have now the satisfaction to mention, that it has been for more than eight monthsf in the Cabinet of the Lyceum.

It is the thumb of a large crab, much larger than any simt iar part of this animal that I-remember to have seen fossil. Its shape is an incurvated cone, having on the inner margin a tow of tubercles. This specimen differs from my that I have seen described, and was found in the vicinity of Yorktown, Virginia, imbedded in a conglomerate, similar to the matrix of the va- luable fossil shells lately presented to our Cabinet. Among these we find marry of the beautiful varieties charactetising the tertiary formations of Europe.

DESCRIPTIONS of new American species of the Generu BUPBESTIS, TRACHYS, and ELATER. By Trious SAY.

Read January 17, 1825.

BUPRE STIS.

1. B. frumversa. Cupreous or blackish ; elytra with striae of punctures ; a glabrous line between the eyes.

DESCRIPTION. Body varying in colour, from a dull cupreous to brownish black : head with large, confluent punctures, and a distinct elevated line extending transversely between the eyes : eyes distant : thorajc with large confluent punc-

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