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This is a diagram illustrating the compound eye of anthropods. A, the whole eye shown in section; B, one of the eye-elements (ommatidium) more highly magnified. c, cuticular facets; ep, epidermis; l, group of celis forming lens-like body; n, optic nerve fibres; o, optic ganglia; p, pigment celis.

Anthropod

This is a diagram illustrating the compound eye of anthropods. A, the whole eye shown in section; B,…

The eleventh and twelfth ribs have each a single articular facet on the head, which is of rather large size; they have no neck or tuberosity, and are pointed at the extremity.

Eleventh Rib

The eleventh and twelfth ribs have each a single articular facet on the head, which is of rather large…

The first rib is the shortest and the most curved of all the ribs; it is broad and flat, its surfaces looking upward and downward, and its borders inward and outward. The head is of small size, rounded, and presents only a single articular facet for articulation with the body of the first thoracic vertebra.

First Rib

The first rib is the shortest and the most curved of all the ribs; it is broad and flat, its surfaces…

The second rib is much longer than the first, but bears a very considerable resemblance to it in the direction of its curvature. The nonarticular portionof the tuberosity is occasionally only slightly marked.

Second Rib

The second rib is much longer than the first, but bears a very considerable resemblance to it in the…

The tenth rib has only a single articular facet on its head.

Tenth Rib

The tenth rib has only a single articular facet on its head.

The eleventh and twelfth ribs have each a single articular facet on the head, which is of rather large size; they have no neck or tuberosity, and are pointed at the extremity.

Twelfth Rib

The eleventh and twelfth ribs have each a single articular facet on the head, which is of rather large…