130 Proceedings of the Royal Society of Victoria. 



instead of gradually becoming narrower, gradually become wider, 

 the caudal segment also participating in a greater width in like 

 degree. The shape of each segment, except in relation to size, is 

 identical with those of the female, the caudal segment however is 

 relatively broader, and consequently subspherical instead of 

 ovoidal in shape. 



The only other observed difference from the female is in the 

 pleopods, which are similar in general form to those of Jatiira. 

 The middle piece of the operculum has each outer distal angle 

 slightly produced and bilobate, and the ends of each lobe fringed 

 with setae. The extremity has a triangular cleft in the middle, 

 and the angles thus formed are distally fringed with a row of 

 setae ; the margins on each side between these angles and the 

 outer angles are slightly concave and free from setae. 



DESCRIPTION OF PLATES XVIII. and XIX. 



Fig. 1. — Dorsal view of female of ya«/r^//a/«i'/7/a x 22. 

 „ 2. — Dorsal view of male of Janirdla pusilla x 22. 

 „ 3. — Portion of inferior antenna x 66. 

 „ 4. — Upper lip x 66 



5.— Mandible of left side x 160. 

 „ 6. — Lower lip x 66. 

 „ 7. — First maxilla x 160. 



^j 8. — Second maxilla x 66. (a). Extremity of outer lobe 

 X 160. 



9.— Maxilliped x 66. {a). Plate of basos x 160. 

 „ 10. — First leg of right-hand side x 42. 

 „ 11. — Extremity of first leg x 200. (a). Spine from margin 



of propodos X 390. 

 „ 12. — Portion of last leg x 42. 



„ 13. — Middle piece of male operculum, outside view x 28. 

 „ 14. — Third pleopod x 33. 

 „ 15. — Fourth pleopod x 33. 

 „ 16. — Fifth pleopod x 33. 



