292 CEYLON PEARL OYSTER REPORT. 



and in the general washings of Invertebrates. The pointed cephalic and thoracic 

 segments, the anterior antennae, and the 3-jointed abdomen are the characters which 

 distinguish this genus and species. 



Cletopontius, n. gen. 



Body broadly ovate, the cephalic segment forming about f of the entire body. 



Abdomen 3-jointed. Inner branch of posterior antennae 2-jointed. Mandible 

 stylet-shaped, palp 1 -jointed. Maxilla and maxillipeds as in Asterocheres. First, 

 2nd and 3rd pairs of natatory legs 2-branched, both branches 3-jointed; 4th pair 

 composed of 1 branch only. 



The characters of this genus do not agree in all respects with any of the known 

 sub-families of the Asterocheridaj, and a new sub-family may therefore be required 

 for its reception. 



Cletopontius serratus, n. sp. Plate XX., figs. 9 to 18. 



Length, female 0"8 millim. ; male unknown. 



Lateral edges of 1st and 2nd thoracic segments bluntly serrated. Abdomen small, 

 the genital segment being about equal in size t<> 16 of either of the 2 following joints, 



Anterior antenna 18 -jointed, the proportional lengths of the joints being as follows : 

 1. 2. 3. 4. 5 . 6. 7. 8. 9. 10. 1 1 . 12. 1 3. 1 4. 15. 16. 17. 18. 

 28. 12. 7. 15. 6. 8. 10. 3. 6. 12. 10. 8. 8.10.10.13.14 3. 



The 4th joint is faintly divided into 3, the 16th joint bears a long filament. Inner 

 branch of posterior antenna 2-jointed ; the apical joint less than ^ the length of the 

 basal joint. 



The other characters as those of genus, which readily distinguish it. A few 

 specimens, all female, were found in the general washings of dredged Invertebrates. 



Bradypontius siphonatus, Giesbr. 

 Found in washings from Ceylon dredged material. 



Artotrogus orbicularis, Boeck. 

 One specimen was in the general washings from Ceylon dredged Invertebrates. 



Stephopontius, n. gen. 



Body sub-quadrate, a strongly marked dividing line separating the cephalic 

 segment from the thoracic joints ; all have rounded margins. 



Abdomen of female composed of 1 joint ; that of male 3-jointed. Anterior antenna 

 of female 6-jointed ; the male antenna is 2-jointed, the apex forming in conjunction 

 with the extremity of the basal joint what appears to be a strong clasping organ. 



