Comparisons.--This specimen comes from a very small bird. The only modern pelagic birds in this size range are the storm-petrels of the family Oceanitidae and the fossil resembles this family in the extremely straight shaft of the ulna, the shape and depth of the tendinal grooves, and the relatively well-developed scars for the attachment of the secondaries. It differs from the Oceanitidae in having the ventral lip of the external condyle much more rounded and protrudent past the plane of the shaft, whereas the carpal tubercle in dorsal view is markedly smaller. On this basis, the fossil certainly could not be referred to the Oceanitidae and that it should be associated with the Procellariiformes may be doubted as well. [Illustration: Figure 10.--_Tytthostonyx glauconiticus_, new genus and species (holotype, NJSM 11341), right humerus: _a,b_, anconal and palmar views of uncoated specimen to show reconstructed areas, × 0.8; _c,d_, stereophotographs of coated specimen in anconal and palmar views, × 1.3.] [Illustration: Figure 11.--_Tytthostonyx glauconiticus_, new genus and species (holotype, NJSM 11341), stereophotographs of distal end of right humerus: _a_, anconal view; _b_, palmar view; _c_, ventral view; _d_, dorsal view; _e_, distal view. (All figures × 2; specimens coated with ammonium chloride to enhance detail.)] =Aves, incertae sedis= Figure 9_g_ Referred Material.--Distal end of left femur, NJSM 12119. Locality and Horizon.--Inversand Company marl pit, Sewell, Gloucester County, New Jersey; from processed spoil piles, precise stratum unknown; collected 12 December 1981 by Cynthia Miller. Presumably from the Hornerstown Formation but could be either Late Cretaceous or Paleocene. Measurements (in mm).--Distal width 4.3, distal depth 3.8. Comparisons.--This is also from a very small bird, possibly the same size as the species represented by the preceding ulna (ANSP 15713; Figure 9_e,f_) but probably somewhat larger. It is characterized by an extremely well-developed tubercle for the attachment of M. gastrocnemius lateralis. A perfunctory perusal of modern taxa revealed nothing similar. =Discussion= Because the specimens treated here are avian and of Mesozoic age, it is almost certain that too much importance will be made of them by some future authors. Indeed, it will probably be years before the literature can be expunged of the records of presumed occurrences that arose from previous misidentifications of these fossils. Therefore, in an effort to forestall overenthusiasm for these fragments we shall present our own brief assessment of their significance.