of the Fishery Board for Scotland. 
. 162, Gut, I. Zoéa, showing convoluted condition of the gut in the 
ary thoracic region ; g’, straight anterior portion of 
gut; g’, portion of gut dorsal to the developing third 
Peaikpeds and the pereiopods. 
. Cast integument, I. Zoéa, ventral view ; 0. cornea; 7. see 
. Sternum of thorax, first young stage, ¢. "tubercle, 
: Third swimmeret of Carcinus menas (2), measuring 54 mm, 
across the broadest part of the carapace, 
PLATE XIII. 
. Carapace, first young stage, 
. First young stage, 
. Carapace of adult Carcinus menas ( 3) natural size, 
. Ventral surface of first young stage. The hairs, etc., on the 
external surface of the abdomen are not shown, 
. Third young stage (drawn from a moulted integument), 
. Carapace of a fourth young stage, ‘ 
2. Half of carapace of a young Carcinus menas measuring 
5°5 mm. across, 
. Second young stage, 2 - : : : : 
. First and second joints (protopodite), second maxillipede, 
IV. Zoéa. 
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