280 CEYLON PEARL OYSTER REPORT. 



Lichomolgus elegans, n. sp. Plate XVI., figs. 8 to 13. 



Length, female 1"5 millim. ; male unknown. 



Cephalothorax 6-jointed. Abdomen 4-jointed, the genital segment being longer 



than the 3 succeeding joints combined, and having a wedge-shaped notch near the 



centre on each side. Anterior antennas 7 -jointed, the proportional lengths being as 



, ,. 1. 2. 3. 4. 5. 6. 7. 

 follows : - 



11. 32. 4. 11. 9. 7. 4. 



Posterior antennas 3-jointed, the first joint rather longer and nearly double the 

 width of each of the succeeding joints. The third joint bears a strong apical claw. 

 Maxillipeds resemble L. buddhensis, but are stouter. Inner branch of 4th pair of 

 natatory legs 2-jointed, the outer joint being about double the length of the inner. 

 Furcal rami very short, about as broad as long. 



One specimen only, a female, was found in the general washings from dredged 

 Invertebrates. The notched abdominal genital segment is the most striking charac- 

 teristic of this species. 



Lichomolgus robustus, n. sp. Plate XVI., figs. 14 to 20. 



Length, female 1*1 millim. ; male unknown. 



Cephalothorax robust, ovate, 6-jointed. Abdomen 4-jointed ; the genital segment 



about as long as the combined 2 succeeding joints. Anterior antennae 7 -jointed, the 



, , . 1. 2. 3. 4. 5. 6. 7. 



proportional lengths being as follows : - 



15. 32. 5. 11. 8. 8. 5. 



Posterior antennas similar to L. simplex, but more robust. Mandible stylet serrated 

 on outer edge. Maxillipeds and natatory legs like L. buddhensis. Furca about half 

 as long again as broad. 



One specimen only, a female, was found in the general washings from dredged 

 Invertebrata. In many points there is a great resemblance between this species and 

 L. buddhensis; but in the jointing of the cephalothorax, and more particularly of 

 the abdomen, and in the small size of the 5th natatory legs in this species, the 

 difference is so considerable that we are justified in separating them. 



Lichomolgus gigas, n. sp. Plate XVI., figs. 21 to 26. 



Length, female 2 millims. ; male 1*4 millims. 



Cephalothorax ovate, 6-jointed. Abdomen, female 4-jointed ; male 5-jointed. 



Anterior antennas long and slender, 7-jointed ; the proportional lengths being as 



... 1. 2. 3. 4. 5. 6. 7. 

 follows : 



12. 32. 4. 16. 12. 9. 7. 



Posterior antennas, mouth organs, and natatory legs and furca nearly resemble 

 L. simplex. 



One of each sex were found in the general washings of dredged Invertebrata. 



