FIG. 39.--Astacus fluviatilis.--The cephalothoracic sterna and the endophragmal system ( x 2). A, from beneath; B, from above. a, a', arthrophragms or partitions between the articular cavities for the limbs; c.ap, cephalic apodeme; cf, cervical fold; epn. 1, epimeron of the antennulary somite; h, anterior, and h', posterior horizontal process of endopleurite; lb, labrum, m, mesophragm; mt, metastoma; p, paraphragm; I--XIV, cephalothoracic sterna; 1-14, articular cavities of the cephalothoracic appendages. (The anterior cephalic sterna are bent downwards in A so as to bring them into the same plane with the remaining cephalothoracic sterna; in B these sterna are not shown.)
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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