294 



ZOOLOGY 



Appendages of Asdlus. 



1. Antenniiles. 



2. Antennae. 



3. Mandibles. 



4. 1st maxillae. 



5. 2nd 



Maxillipedes 1 ^ 



n ■, n -nr ■,-, ■ i 1" tlioracic. 

 7-1 3. Walking legs / 



14-19. Abdominal legs 



(only five in the female). 



The appendages are nearly the same as in Amphipods ; there 

 are two pairs of antennae, the second being much the larger; both 

 are uniramous. The mandibles carry a palp. There are two 

 pairs of maxillae and a pair of maxillipedes, and seven pairs of 

 walking thoracic limbs, of which the anterior are directed forward, 

 the posterior backward. The most anterior of all are prehensile 

 organs, and lie forward against the maxillipedes ; they are en- 

 larged in the male, and take no part in locomotion. There are 

 six pairs of abdominal appendages in the male, and five in the 



wwax 



Fig. 170. — Asdlus aqiialicus. 



Side view of female, 

 after G. 0. Sars. 



From Leuckart and Nitsche, 



I. -VI. The six anterior segments 

 forming the cephalothorax. 

 VII. -XIII. The seven free thoracic seg- 

 ments. 

 XIV. -XIX. The six abdominal segments, 

 partly fused. 



1. The anterior antennae. 



2. The posterior antennae. 



3. The mandible (jialp). 



4. The 1st maxilla. 



5. The 2nd maxilla. 



6. The maxillipede. 



-13. The thoracic limbs. 



14. 1st abdominal appendages. 



16. 3rd abdominal appendages. 



17. 4th abdominal appendages. 



18. hVa. abdominal appendages. 



19. Last abdominal appendage. 



20. Eyes. 



21. Heart, with three pairs of stigmata. 



22. Ovary and oviduct opening on 



base of 5th thoracic limbs. 



23. Brood-pouch. 



female ; in the former the second pair are modified in connection 

 with the opening of the genital duct, this pair are absent in the 

 female. The three following pairs act as branchiae ; the exo- 

 podite and endopodite are both squarish, lamelliform structures, 

 the former lying over and protecting the latter, which has very 



