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"Transverse section of a retinula of the lateral eye of Limulus, showing ten retinula cells (ret), each bearing a rhabdomere (rhab)." — The Encyclopedia Britannica, 1910

Limulus

"Transverse section of a retinula of the lateral eye of Limulus, showing ten retinula cells (ret), each…

"Diagram of a retinula of the central eye of a scorpion consisting of five retina-cells (ret), with adherent branched pigment cells (pig)." — The Encyclopedia Britannica, 1910

Retinula

"Diagram of a retinula of the central eye of a scorpion consisting of five retina-cells (ret), with…

"Rhabdom of the same, consisting of five confluent rhabdomeres." — The Encyclopedia Britannica, 1910

Rhabdom

"Rhabdom of the same, consisting of five confluent rhabdomeres." — The Encyclopedia Britannica,…

"Transverse section of the rhabdom of a retinula of the scorpion's central eye, showing its five constituent rhabdomeres as rays of a star." — The Encyclopedia Britannica, 1910

Rhabdom

"Transverse section of the rhabdom of a retinula of the scorpion's central eye, showing its five constituent…