462 



CRUSTACEA. 



different form and adaptation in the various groups. As a rule, the 

 anterior pairs are modified to assist in taking up food and are moved 

 nearer the mouth ; these are the maxillipeds, which, with regard to 

 their structure, hold an intermediate position between jaws and feet. 

 In the Deccipoda (fig. 3G2) three pairs of appendages have the form 



FIG. 362. Male and female of Antaeus Jluvlatilis seen from the ventral side. In the male the 

 ambulatory and abdominal leet of the left side have been removed; in the female the am- 

 bulatory feet of the right side and the maxillipeds of both sides. A' antennules ; A", 

 antenna? ; PI, scale of antenna ; Md, mandible with palp ; MX', MX", first and second maxillse 

 JUTr/ 1 to Mxf, the three pairs of maxillipeds ; Goe, genital opening ; Doe, opening of the 

 green gland; F' t F", first and second abdominal foot ; Ov, eggs ; A, anus. 



of maxillipeds, so that there are only five pairs of legs left on the 

 thorax. In the Stomatopoda the first five pairs of thoracic append- 

 ages are modified to form maxillipeds and there are only three pairs 



