94 



BRANCH ARTHROPODA 





Fig. 68. Astacus fluviatttis. Ventral or sternal views (nat. size). 

 A, Male; B, female: a, Vent; gg, opening of the green gland; Ib, labrum; 

 mt, metastoma or lower lip; od, opening of the oviduct; tSd, that of the vas 

 deferens; 1, eye-stalk; 2, antennule; 3, antenna; 4, mandible; 8, second 

 maxillipede; 9, third or external maxillipede; 10, forceps; 11, first leg; 

 14, fourth leg; 15, 16, 19, 20, first, second, fifth, and sixth abdominal ap- 

 pendages; x, xi, xiv, sterna of the fourth, fifth, and eighth thoracic somite; 

 xvi, sternum of the second abdominal somite. In the male, the 9th to the 

 14th and the 16th to the 19th appendages are removed on the animal's 

 left side; in the female, the antenna (with the exception of its basal joint) 

 and the 5th to the 14th appendages on the animal's right are removed; 

 the eggs also are shown attached to the swimmerets of the left side of the 

 body. (Huxley.) 



