272 
THE VOYAGE OF H.M.S. CHALLENGER. 
Bala;uula3.' Eight bullaa, 2 to 3 inches (G4 to 76 mm.) in length, somewhat resemble 
those of Ziphius cavirostris, thougli without the unciform lobe.^ About forty specimens, 
1'6 to 2‘3 inches (41 to 58 mm.) in length, belong to the genus Mesoplodon ; the two 
largest, in which the petrous bone was united with the tympanic, could not be deter- 
mined, but the rest ajDparently belong to Mesoplodon layardi.^ Twenty-four specimens, 
1 to 1‘7 inches (25 to 43 mm.) in length, belong apparently to the Delphinidse ; the 
longest resembles the bulla of Glohiocephcdus,^ others belong to the genus Delpliinus, 
while the smallest are like those of the common porpoise. One specimen belongs to the 
genus Kogia,^ and other two are closely allied to it.® 
The larger petrous bones, the longest being 2 inches (51 mm.) in length, probably 
belong to the genus Mesoplodon, the others to the genus Delphinus, while two specimens 
are smaller than those of the common porpoise.^ There were fourteen specimens consisting 
of the petrous and a portion of the elongated mastoid element continuous with it, varying in 
length from 2‘5 to 3 '6 inches (64 to 91 mm.), belonging apparently to the Baleen whales.® 
There were also numerous fragments of other bones, including a beak of a Ziphioid 
whale,® measuring over 8 inches (20 cm.) in length, and three smaller fragments of beaks 
of Ziphioids ; numerous flat fragments, portions of the brain case,^® and one or two probably 
bits of the shaft of a rib. An irregular mass of spongy bone 8x4x3 inches (20 x 10 
X 8 cm.), not nearly so much impregnated with manganese as the rest, and two smaller 
fragments," one 5x5 inches (13 x 13 cm.), are apparently portions of the expanded wings 
of superior maxillae. Nearly two hundred small fragments, forming the nuclei of man- 
ganese nodules, exhibited evidence of bone structure. 
A portion of the spongy mass of whale’s bone was completely analysed by Professor 
Dittmar, F.R.S.," with the following results : — 
Moisture, ...... 306 
Combined water, ...... 3’66 
Phosphoric acid, . . . . . . 27 49 
Carbonic acid, ...... 414 
Fluorine, 0 71 = (F 2 — 0), ..... 0 41 
Lime, ....... 3900 
Magnesia, ....... 201 
Ferrous oxide, ...... 104 
F’crric oxide, ...... 4 83 
Binoxide of mang.anese, . . . . . 161 
Alumina, ....... 270 
Silica and substances insoluble in hydrochloric acid, . 9 08 
Alkalies and 1os.h, ...... 0 97 
10000 
* .See I’l. VII. figii. 4, 6. * Fif^ured in Zool. Chnll. E.\p., pt. iv. ]>1. ii. fig. 12. ^ See PI. VIII. figs. 1, 2. 
* .S«.-e PI. VIII. fig. 0. * .See PI. VIII. fig. 7; also figured in Zool. Clmll. E.xp., j»t. iv. pi. ii. fig. 1.3. 
Figiind in Zwl. Chall. Exj»., jd. iv. pi. ii. fig. 14. ^ See PI. VIII. figs. 8, 9, 14. * See PI. VIII. fig. 3. 
* S<je PI. X. fig. I. Sec PI. X. fig. 2. *' * See PI. X. fig. 3. *'■' See Appendix III. 
