Cs 
Fic. 3.—Astucus fluviatilis, Ventral or sternal views (nat. size). A, male; B, female :— 
a, vent; gg, opening of the green gland; lb, labrum; mi, metastoma or lower 
lip; od, opening of the oviduct ; vd, 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 appendages; x., x, xiv., sterna of the fourth, fifth, 
and eighth thoracic somite ; xv1., 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. 
