Fig. 1--Astacus fluviatilis.--Side view of a male specimen (nat. size):--bg, branchiostegite; cg, cervical groove; r, rostrum; t, telson.--1, eye-stalk; 2, antennule; 3, antenna; 9, external maxillipede; 10, forceps; 14, last ambulatory leg; 17, third abdominal appendage; 20, lateral lobe of the tail-fin, or sixth abdominal appendage; XV, the first; and XX, the last abdominal somite. In this and in succeeding figures the numbers of the somites are given in Roman, those of the appendages in ordinary numerals.
[Editor's note: original printed illustration was about 2.5in (6.5cm) vertical by 3.5in (9cm) horizontal, or approximately twice the size of this reproduction.]
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