1887.] G. M. Giles — Six new Amjjhipods from the Bay of Bengal. 229 



like plates ; they differ, however, considerably in length, the fifth being 

 the shortest of all the thoracic appendages, while the sixth and seventh 

 much exceed the anterior ones, the seventh being more than half as 

 long as the body, and the eighth even longer. 



The first three abdominal appendages are rather long and slender, 

 but are quite of the usual type. The last three are short and cylindrical, 

 having both their protopodites and rami armed with a number of short 

 very stout spines ; they decrease regularly in length from before back- 

 wards, the fourth being as long as the fifth and sixth together, and the 

 sixth, very short. The telson is a short compressed lamina armed with 

 a number of short tooth like spines similar to those on the posterior 

 abdominal appendages. 



EXPLANATION OF THE PLATES. 

 Plate III. 

 Fig. 1. Phronima hucephala, n. sp., male, x 18. Fig. 2. Last three abdo- 

 minal segments of the same with their appendages, x 60. Fig. 3. Phronimella 

 hippocephala, n. sp. x 12* 5. 



Plate IV. 

 Fig. 1. Rhabdosoma investigatoris, n. sp., female, as seen by dark ground illu- 

 mination. x 3*8. Fig. 2. Thorax with appendages of the same, x 14. Fig. 3. 

 End of an antennule. x 200. 



Plate V. 

 Fig. 1. Amphipronoe longicornutus, n. sp., male, x 17. Fig. 2. Antennnle. 

 X 39. Fig. 3. Flagellum of antennule. x 180. Fig. 4. An antenna, x 7. 

 Fig. 5. First joint of an antenna, x 40. Fig. 6. Head seen from below (diagram- 

 matic). Fig. 7. 2nd thoracic appendage, x 110. Fig. 8. Last three abdominal 

 segments, x 25. 



Plate VI. 

 Fig. 1. Lestrigonus lengalensis, n. sp., male, x 40. Fig. 2. Last joint of 

 antennule. x 400. Fig. 3. Last joint of an antenna, x 400. Fig. 4. Peduncle of 

 antennule. x 100. Fig. 5. Peduncle of antenna, x 100. Fig. 6. Mandible and 

 its appendage, x 200. Fig. 7. Masticatory plate of mandible, x 200. Fig. 8. 

 The maxillse. x 200. Fig. 9. Portion of maxilipede. x 100. ^ig. 10. Last three 

 segments of abdomen with their appendages, seen from above, x 60. 



Plate VII. 

 Fig. 1. Lestrigonus bengalensis, n. sp., immature male, x 40. Fig. 2. Last 

 three segments, seen from below, x 40. Fig. 3. Lestrigonus bengalensis, female. 

 X 40. Fig. 4. An ovum from her brood-pouch, x 40. Fig. 5. Head of female, 

 front view, x 40. Fig. 6. Mandible and its appendages, x 200. Fig. 7. 1st 

 maxilla, x 200. Fig. 8. 2nd maxilla, x 200. Fig. 9. Maxillipede. x 200. 



Plate VIII. 

 Eurysthsus hirsutus, n. sp. x 40. 



