22 PROCEEDINGS OF THE NATIOITiVL MUSEUM vol.85 



Family PROCELLARIIDAE 



PUFFINUS species 



A specimen (U.S.N.M. no. 15160) comprising about two-thirds 

 of the distal portion of a right hmnerus was obtained by R. Lee 

 Collins on March 30, 1937, on the beach about 1 mile south of the 

 Chesapeake Beach pier. It is well fossilized, dull brown in color, 

 and evidently a bone that has weathered out from the Calvert forma- 

 tion in the adjacent cliffs. 



It is from a species of the dimensions of living Cory's shearwater 

 {Puifinus diomedea horecdis), being distinctly larger than P. conradi 

 from the Miocene of Maryland, and it evidently represents an unde- 

 scribed form. Unfortunately it has been worn in the sands of the 

 beach until the projecting processes of the distal end have lost those 

 characters that serve to characterize species in this group. "While 

 obviously different from Cory's shearwater because of its antiquity, 

 no characters remain in the bone that will serve to separate it in- a 

 technical diagnosis. It is listed therefore for the present under the 

 generic name only. 



It has the following measurements: Greatest transverse diameter 

 across the distal end, 14.9 nun; transverse diameter of shaft near 

 center, 6.7 mm. 



Family SULIDAE 



SULA AVITA, new species 



Characters.— Loyver end of humerus (fig. 2) similar to that of 

 modern Sula piscator (Limiaeus) ^ but much smaller; ectepicondylar 

 process less prominent ; brachial depression shallower ; olecranal fossa 

 relatively smaller and less deeply impressed. 



Type. — U.S.N.M. no. 13854, distal end of right humerus (processes 

 somewhat broken), collected in situ in zone 10, Calvert formation of 

 the upper Miocene, near Plumpoint, Md., on January 1, 1934, by 

 Dr. W. G. Lynn. 



Description. — Shaft compressed at distal end, flattened on anterior 

 face, with the inner margin thin edged, rounding from this to join 

 the outer margin at a right angle; ectepicondylar process slight, 

 extending out in a gradual curve; radial trochlea (partly broken 

 away) comparatively small; ulnar trochlea rounded, elongate, globu- 

 lar, projecting distally distinctly below tlie level of the radial troch- 

 lea ; tubercle for pronator hrevis elongate, triangular, rising in a low 

 point; brachial depression flat and slightly impressed; olecranal fossa 

 relatively shallow. Bone dull brown in color, not mineralized, but 

 with all organic matter removed so that it appears slightly porous. 



-Pclecanus piscator Linnaeus, SystPma naturae, ed. 10, vol. 1, 1758, p. 134. 



