98 BULLETIN 36, UNLFED STATES NATIONAL MUSEUM. 



iu the former is relatively longer aud narrower; the intermaxillaries are 

 much narrower ; the brain-case is narrower at the orbits; aud the tem- 

 poral fossie are smaller. The teeth are more numerous and the skull is 

 much lighter iu all its parts. The skulls of L. clanculus, as already 

 stated, appear to belong to a smaller species than L. ohliquidcns, and 

 are much lighter. The rostrum is relatively broader than iu L. obliqui- 

 detis as is also the brain-case at the orbits, and at the posterior margin 

 of the temi)oral fossa3. These fossa;, although of about the same length 

 as those of L. obliquidenSj are more depressed. 



Iu the younger specimen of the species under consideration the teeth 

 have been reset, aud the number can not therefore be relied upon. In 

 the adult skull, No. 19G2, the teeth in the superior maxillary number 

 3:3 on each side; in the mandible, 29 on each side. They are conical 

 and acute and lean strongly outward. 



The color of L. ohUqiiidens has been recorded both by Captain Scam- 

 mon aud Mr. Dall. The former describes it as follows: 



In point of color it is greeuisli-black on tho upper surface, lightened on tlio sides 

 with broad longitudinal strijiesof white, gray, aud dnll black, ^Yhich in most exam- 

 ples run into each other, but below it is of a pearly or snowy white. The posterior 

 edge of the dorsal tin is tipped with dull white or gray, and sometimes the llukes are 

 marked iu the same manner.* 



In another part of the same work Mr. Dall describes the color as 

 follows : 



The animal is rather thick in proportiou to its length ; black above, with a strongly 

 falcate dorsal. Below, white, to the edge of tho patch passing from the lower lip 

 below the pectorals aud termiuatiug a short distauce behind the vent. A broad gray 

 smoueh ou each side above the line of the black color, aud interrupted about the 

 middle of the auimal on each side; the edges of the gray are ill-defiued. The pos- 

 terior edges of the pectorals and dorsal are also grayish. t 



Fiom these descriptions and the figures given by Seammou it would 

 appear that the coloration of X. ohliquidens differs somewhat from both 

 of the well-known species L. acutus and L. albirostris, for in the last- 

 named the white of the belly extends upon the upper lip, and in L. 

 acutus the light color of sides occupies only an area rather high up and 

 back of the dorsal fin. 



Captain Scammon gives to this species a very wide range, but does 

 not state localities. Mr. Dall, however, states that the specimens de- 

 scribed by him were taken at Monterey, November 20, 1872. Dr. Gill's 

 types (Nos. I9G1-G3) were obtained on the coast of California by Lieut. 

 W. P. Trowbridge. The skeleton described above (No. 14329) was also 

 obtained on the coast of California, but no particular localities are giveu 

 in either instance. A defective cranium (No. 3123) is from Puget Sound. 



* Scammon, Marine Mammalia, 1874, 98. 



tDall iu Scammou's Marine Mammalia, 1874, 293. 



