288 CEYLON PEARL OYSTER REPORT. 



Body nearly circular in outline. Cephalothoracic segment large. Anterior 

 antennas 20-jointed ; proportional lengths of joints : 



1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 

 12. 5. 4. 3. 3. 3. 3. 4. 4. 5. 4. 4. 5. 7. 7. 7. 10. 6. 4. 2. 



Posterior antennas, mandible and palp, maxilla, maxilliped, and natatory legs, 1st 

 to 4th, nearly as in other Asterocheres. Fifth feet very narrow, about 3|- times longer 

 than broad, furnished with three apical setae. Abdomen 3 -jointed, about ^ the 

 length of the body, joints of moderate length, genital segment slightly longer than 

 the 2nd joint, last joint about f the length of the second. Furca very short, 

 about as broad as long, and only the length of the last abdominal joint. The 

 male is slightly smaller than the female, and has the anterior antenna only 17-jointed. 

 The genital segment of the abdomen is slightly longer than the combined lengths of 

 the next 2 joints. 



A number of specimens in washings from material collected off Point de Galle. 

 This species is easily recognised by its circular body and narrow abdomen. 



Asterocheres minor, n. sp. Plate XVIIL, figs. 29 to 31. 



Length, female 0*8 millim. ; male 0'7 millim. 



In general appearance very like Asterocheres major, only much smaller. 



Anterior antennas 20-jointed ; proportional lengths of joints : 



1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 

 10. 3. 3. 3. 2. 2. 2. 3. 4. 4. 3. 3. 4. 4. 5. 6. 8. 4. 5. 2. 



Other appendages similar to A. major. 



The distinguishing characters of this species are the difference in the proportional 

 lengths of the joints of the anterior antennas, the different proportional lengths of the 

 abdominal joints and the furca, the latter beiug about |- the length of the last 

 abdominal joint. 



Several specimens in washings from Gulf of Manaar sponges. 



Asteropontius, n. gen. 



Cephalothorax roundly ovate, 5-jointed, the cephalic segment larger than the 

 combined lengths of the 4 following segments. Anterior antennas 18-19-jointed. 

 Abdomen 3-jointed. 



Outer branch of posterior antennas 4-jointed, a small 1 -jointed branch springing 

 from the 1st joint. Maxilla 2-branched. Mandible long and narrow ; palp 1 -jointed. 

 Maxillipeds and natatory legs, 1st to 5th, as in Asterocheres. 



Asteropontius typicus, n. sp. Plate XIX., figs. 1 to 10. 



Length, female 0"96 millim. ; male unknown. 



Cephalothorax roundly ovate, about twice the length of abdomen ; genital segment 



