Drosophila, head & antennae, left and right. Showing aristapedia, or the mutation of antennae (aristae) into leg-like structures. Dated by Wallace 1938, with initials CBB (Calvin B. Bridges). On drawing: 6B. Aristapedia, ss a-B male C.B.B. 3 [circled] 58.5.
Drosophila mutation named bithorax. The thorax has an enlarged middle section from which wing-like structures protrude. This drawing was reproduced in the Red Book, p. 94. Mutation first discovered by Calvin Bridges in 1915. On back of drawing: bithorax III; 3-58.8 bithorax & alleles