AKT. 19 A MIOCENE PORPOISE FROM MARYLAND^KELLOGG O 



natural positions. The skeleton was prepared in relief for exhibition 

 and the elements lie in the position in which they were at the timfe 

 they were buried by sediments. The porpoise lies on its left side 

 and the vertebrae are in sequence from the atlas to the fifth lumbar. 

 The vertebral column is not complete, but 7 cervicals, 10 dorsals, 4 

 lumbars, and transverse processes of 3 others, and 10 caudal vertebrae 

 and an epiphysis of another, as well as 4 chevrons, are present. The 

 vertebral column of this porpoise appears to consist of 48 vertebrae, 

 divided as follows : 7 cervical, 10 dorsal, 10 ( ? ) lumbar, and 21 ( ? ) 

 caudal vertebrae. On the right side there are 6 ribs in regular se- 

 quence and articulated with their respective vertebrae: 4 additional 

 ribs lie on the right side of the vertebral column. On the left side, I9 

 ribs are present, but most of them are incomplete. With the excep- 

 tion of the posterior half of the left scapula and the proximal 

 epiphysis of the right humerus, all of the bones of the fore limbs are 

 missing. The skull is essentialy complete, but is crushed slightly;' a 

 relatively small number of the teeth are missing. Both mandibles, 

 and both tympanic bullae and periotics are present. The right thy- 

 rohyal of the hyoids is preserved. This specimen appears to be im-, 

 mature for reasons hereinafter mentioned. 



Locality. — The occurrence is as follows: Near Latitude 38° 40' 

 north, and longtiude 76° 32' west, on the western shore of the Chesa: 

 peake Bay, approximately 1.5 miles south of Chesapeake Beach, 

 Calvert County, Maryland. Shown on the Patuxent quadrangle o^ 

 Patuxent folio. No. 152, United States Geological Survey. ■ •. 



Horizon. — This specimen was discovered and excavated by Nor? 

 man H. Boss on July 5-7, 1913. It was dug from the face of the 

 cliff about 5 feet above beach level in the greenish sandy clay of 

 Shattuck's zone 5 of the Calvert Miocene formation of Maryland. 



INDIVIDUAL II 



Referred specimen. — Cat. No. 10670, Division of Vertebrate 

 Paleontology, United States National Museum. The second speci- 

 men referred to this species consists of an imperfect and slightly 

 crushed skull, with the extremity of the supraorbital process of the 

 left frontal and overlying plate of the maxilla, as well as the left 

 zygomatic process missing; both pterygoids are damaged. All pi 

 the teeth with the exception of three, both mandibles, and both 

 tjanpanics and periotics are missing. This skull belonged to a mature 

 individual. 



Locality. — The occurrence is as follows: Near latitude 38° 40' 

 north, and longitude 76° 32' west, on the western shore of the Chesar 

 peake Bay, south of Chesapeake Beach, Calvert County, Maryland-. 

 Shown on the Patuxent quadrangle or Patuxent folio. No. 152^ 

 United States Geological Survey. 



