ART. 19 A MIOCENE PORPOISE FROM MARYLAND — KELLOGG 43 



the base and forms a distinct angle. The neural arch is not crushed 

 and is not quite as broad as the minimum anteroposterior diameter 

 of the neural spine. In spite of the fact that the neural spine is 

 broken transversely beloAv the middle, at the base, and at the ex- 

 tremity, it is otherwise fairly well preserved. 



Second lumbar. — As compared with the first lumbar, the centrum 

 (pi. 9, fig. 5) is slightly longer and wider, the transverse processes 

 are longer, and the neural canal is narrower. All of the right 

 transverse process, the distal extremity of the neural spine, and both 

 epiphyses are missing. The right metapophysis is complete and 

 difl'ers from that on the preceding in that no angle is formed at the 

 base by the superior margin, while the inferior is distinctly angulate. 

 The median inferior carina is more distinct than on the first lumbar. 

 The neural spine is broken transversely near the middle and the 

 extremity is slightly damaged. The left transverse process is more 

 slender, slightly longer, but with the extremity similar to that on 

 the preceding lumbar. 



Third lurtibar. — The major portion of the centrum (pi. 9, fig. 6), 

 all of the right transverse process, the posterior epiphysis, and the 

 neurapophysis on the right side are missing. The right metapophy- 

 sis is damaged, but seems to agree with that on the second lumbar. 

 The left transverse process is slightly longer than that on the pre- 

 ceding lumbar and the anteroexternal angle is less obliquely trun- 

 cated. The neural spine seems to be complete. It is squarely trun- 

 cated at the extremity and is more noticeably constricted antero- 

 posteriorly than that on the second lumbar. 



Fourth lumhar. — Of this lumbar the left transverse process alone 

 remains and it is shorter than on the third, less noticeably constricted 

 anteropostcriorly near the base, more expanded at the extremity, 

 and the anteroexternal angle is less obliquely truncated. 



Fifth himbar.- — With the exception of the left transverse process 

 all of this lumbar is missing. This process is slightly shorter than 

 on the fourth lumbar, wider anteropostcriorly at the narrowest part, 

 more expanded distally, and the extremity is truncated nearly at 

 right angles to its main axis. 



Ninth luvibar. — The distal portion of the left transverse process 

 is all that remains of this lumbar (pi. 11, fig. 1) and it lacks the 

 anteroexternal angle. It may not be correct as restored. 



Tenth himbar. — Of this lumbar (pi. 10, fig. 1), the neural spine, 

 the neural arches, the anterior epiphysis, and the right transverse 

 process are missing. In comparison to the fifth lumbar, the left 

 transverse process (pi. 11, fig. 2) is somewhat shortened, but the 

 anteroexternal angle is missing. It now appears that the transverse 

 processes are incorrect as restored, because this angle should be less 



