FIG. 12--Astacus fluviatilis.--A dissection of a male specimen from the right side (nat.size). a, anus; aa, antennary artery, cut short; ag, anterior gastric muscles, the right cut away to its insertion; bd, aperture of right bile duct; cm, constrictor muscles of stomach; cae, caecum; cpm, right cardio-pyloric muscle; cs, cardiac portion of stomach; em, extensor muscles of abdomen; fm, flexor muscles of abdomen; ga, gastric artery; gn. 1, supraoesophageal ganglion; gn. 2, sub-oesophageal ganglion; gn. 13, last abdominal ganglion; h, heart; ha, hepatic artery; hg, hind-gut; iaa, inferior abdominal artery; la, right lateral aperture of heart; lr, left liver; mg, mid-gut; oa, opthalmic artery; oe, oesophagus; pg, posterior gastric muscles, the right cut away to its insertion; ps, pyloric portion of stomach; sa, sternal artery; saa, superior abdominal arterty; t, (to the left), telson; t (near the heart), testis; vd, left vas deferens; vd1, aperture of left vas deferens; 2, right antennule; 4, left mandible; 9, left external maxillipede; 10, left forceps; 15, first, 16, second, and 20, sixth abdominal appendages of the left side.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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