Bulletins of American paleontology . he Green Sand of New Jersey, byProf. Lcidy. My collection con-tains several teeth discovered onthe Xeuse Piver. In most speci-mens the crown lias lost its apex,but the fang is entire. In the per-fect condition, the crown has beenlaterall_y compi-essed, conical andiuYcrted with smooth, shining en-expands fiom the crown in a pyramidal man-ner ; is quadrilateral, curved back^vard, and divided at l>aseantero-posteriorly ; the division becoming deeper larger specimen, in the figure, which is of a red color,when perfect, was nearlY, or perhaps
Bulletins of American paleontology . he Green Sand of New Jersey, byProf. Lcidy. My collection con-tains several teeth discovered onthe Xeuse Piver. In most speci-mens the crown lias lost its apex,but the fang is entire. In the per-fect condition, the crown has beenlaterall_y compi-essed, conical andiuYcrted with smooth, shining en-expands fiom the crown in a pyramidal man-ner ; is quadrilateral, curved back^vard, and divided at l>aseantero-posteriorly ; the division becoming deeper larger specimen, in the figure, which is of a red color,when perfect, was nearlY, or perhaps quite two inches inlength. Its fang is an inch long, eight lines antero-perterior-ly at base, and six lines transversely. The base of the crownis oval in section, and measures six lines antero-perteriorly,and five lines transversely. The smaller specimen is black in color, and was about halfan inch shorter than the otlier. Its fang is about ten lineslong, and at base is about six lines square. It belongs tomiocene of amel. The faui FOSSIL SQUALIDAE OF THE TERTIARY OF THE EASTERN COUNTIES. The fossil squalid ae, or sharks, are known only by theirteeth, as these are the only parts which are usually North Carolina Geol. Sur.: Emmons 135 226 nokth-cakoltna geological suetet. Their vertebrae are sometimes preserved, but tliey must boexceedingly rare in beds wbicli are as loose as tlie clays and«ands of the tertiary deposits. But the teeth, being protect-ed by a very dense enamel, and having a firm strong core, re-sist change for ages; it is in these organs, therefore, thatmemorials of this highly interesting order of iisli have beenpreserved. The teeth being attached loosely to a cartilaginous jaw.,are almost always separated and detached; and hence, theyoccur singly. Of tlie mode in which they are connected, wcare informed by the li\ing species whicli inhabit the adjacentseas. From this source of information, we may be assuredthat these single teeth w
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