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506 GEOGRAPHICAL ZOOLOGY. [part iv.<br />

Family 6. — BELEMNITID^. Eossil. (6 Genera, 100<br />

Species).<br />

Distribution.—Lias to Chalk in Europe, India and North<br />

America.<br />

Order IL—TETRABRANGHIA TA<br />

Family 7.—NAUTILID^. (1 Genus, 3 Species, Living; 4<br />

Genera, 300 Species, Fossil).<br />

Distribution.—Indian and Pacific Oceans; and the fossil<br />

species from the Silurian Period to the Tertiary, in all parts<br />

of the world.<br />

Family 8.—ORTHOCERATID^. Fossil. (8 Genera, 400<br />

Species).<br />

Distribution.—Lower Silurian to Lias.<br />

Family 9.—AMMONITID^. Fossil. (14 Genera, 1100<br />

Species).<br />

Distribution.—Upper Silurian to Chalk. Found at 16,000<br />

feet elevation in the Himalayas.<br />

.

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