1894. 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



35 



this specie.s. The color of his No. 8, however, was "very dark above 

 and ashy gray below," in which it agrees, so fiir as tlie ground-color is 

 concerned, with Dr. Abbott's specimens. 



Bringing together in tabular form the measurements of the exterior 

 given by Dr. Abbott and those of Dr. Liitken's No. 8, we have: 



Table 



measurements. 



The number of teeth in the different skulls is as follows: No. 



36059, female, ^g; No. 30040, male, ^^ No. 30051, female, ^^:|^; 



No. 



30031, female, 'J^; No. 30048, male, tl'_Sr The total number, therefore, 

 varies from 150 to 108. The number in Dr. Jjiitken's two specimens 

 was 147 and 103, respectively. 



In the three skeletons collected by Dr. Abbott and tlie two of Dr. 

 Liitken, the number and the divisions of the vertebra; are as follows: 

 No. 36049, ^ .— C. 7; D. 16; L. 20; Ca. 36^.79. 

 No. 36051, 9.— C. 7; 1). 16; L. 20; Ca. 35=78. 

 No. 36048, <?.— C. 7; D. 16; L. 20; Ca. .36=79. 

 Dr. Liitken's : 



No. 8, 9.— C. 7; D. 15; L. 21; Ca. o6=7!». 

 No. 3, (f).— C. 7; D. 15; L. 21; C:i. 38=81. 



The amount of variation here shown is very slight for members of 

 this family. In the tirst and third of Dr. Abbott's specimens, the last 

 pair of ribs is rudimentary, while in the second (No. 30051) there are 

 two rudimentary ribs on the left side and one on the right. Each of 

 Dr. Liitken's specimens liossessed a single pair. 



Tiie characters connected with to the relative position of the processes 

 and foramina of the vertebnie next claim our attention, and here again 

 the amount of variation is small: 



