80 BULLETIN : MUSEUM OF COMPAKATIVE ZOOLOGY. 



From the foi-egoing table it will appear that out of a total of thirteen 

 stations from which sharks' teeth and Cetacean bones were obtained, 

 remains of the former to the number of 133 were dredged from ten 

 stations, and of the latter to the number of 51 from eleven stations. 

 Three stations, all lying outside the barren area as defined by Mr. 

 Agassiz (Nos. 4:666, 4676, 4721), afforded indications of Cetaceans alone ; 

 and two stations, both lying within the barren area (Nos. 4695 and 

 4732) yielded shai'ks' teeth without admixture of Cetacean bones. 

 Possibly this last circumstance may be purely fortuitous ; or again, on 

 the other hand, it may suggest that whales and dolphins were on the 

 whole less precipitate than sharks in venturing upon a tract of gi-eatly 

 diminished food supply. If this were so, one might expect the grega- 

 rious habits of Cetaceans to have had something to do with their 

 avoidance of a barren area. Stragglers might wander in, but the 

 tendency of herds would be to confine their range to areas affording 

 a sufficient food supply. 



General Summary of Results by Stations. 



Station 4656, depth 2222 fathoms. — There were brought up by the 

 dredge from the bottom at this station 10 sharks' teeth, amongst which 

 4 are recognizable as belonging to the genus Lamna, 1 to Oxyrhina, 1 

 to Carcharodon, this last being a fine specimen (Plate 2, Fig. 21), and the 

 rest merely fragments. The Cetacean material consisted of 1 tympanic 

 bulla of Hyperoodon, 1 periotic of Kogia or some very similar form, and 

 one indeterminate long and slender bone. Most of these remains are 

 but slightly encrusted with manganese. 



Station 4658, depth 2370 fathoms. — 4 teeth of Oxyrhina, 9 Lamna, 

 2 nondescript fragments ; also 1 Delphinoid tympanic. Manganese 

 coating very slight. 



Station 4666, depth 2600 fathoms. — No fish remains; 4 excellently 

 preserved ear-bones of Hyperoodon, one having the tympanic still fused 

 Avith the periotic ; also 1 heavily encrusted Delphinoid tympanic, and 

 several corroded osseous fragments. 



Station 4676, depth 2714 fathoms. — No fish remains; 3 rather 

 heavily encriisted ear-bones of Hyperoodon (Plate 3, Fig. 36), and 1 

 unrecognizable fragment. 



Station 4685, depth 2205 fathoms. — This station, which lies within the 

 barren area, is remarkable for having furnished a larger number of verte- 

 brate remains than any other during the cruise, and with them were 

 brought up one and one-half tons of manganese nodules. There are in all 



