278 CEYLON PEARL OYSTER REPORT. 



Lichomolgus gracilis, n. sp. Plate XV., figs. 1 to 9. 



Length, male 0*7 millim. ; female 1 millim. 



Cephalothorax (female) ovate, 6-joiuted, abdomen 3-jointed, the 1st considerably 

 longer and wider than the combined succeeding 2 joints. First joint of male abdomen 

 quadrate ; more than 4 times the size of the 2nd joint. 



Anterior antennae (female) 7-jointed, the proportional lengths of the joints being as 



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



follows : 



17. 25. 9. 11. 12. 7. 5. 



Posterior antennae 3-jointed, the apical joint terminating in a strong curved claw, 

 and having 3 small lateral spines. Mandible has an angular quadrate base, and is 

 pectinated along upper edge ; palp short, with 3 spines, 



First maxilliped has outer joint triangular, sharp and wedge-shaped, and has a 

 serrated curved lateral spine arising from centre ; outer joint of 2nd maxilliped 

 (female) very small, with stout apical spines ; in the male it is a grasping hand with 

 long curved claw. Inner branch of 4th pair of natatory legs 2-jointed. Furcal 

 rami divergent, about 4 times as long as broad. 



Several males and females were found in the general washings of dredged 

 Invertebrates. The mouth organs, posterior antennas, and furcal rami sufficiently 

 distinguish this species. 



Lichomolgus ieversi, n. sp. Plate XV., figs. 10 to 17. 



Length, male 0'96 ; female 1*06. 



Cephalothorax 6-jointed ; cephalic segment subquadrate ; abdomen 4-jointed, the 

 genital segment smaller than in the other species of the genus. Anterior antennae 



7-jointed, the proportional lengths of the joints as follows : 



Posterior antennae 3-jointed ; the middle joint small ; apical joint longer than the 

 combined 1st and 2nd ; with four terminal curved spines, two of which are moderately 

 stout. Mandibles long and narrow, coming to a fine point, edges hairy. Terminal 

 joint of 1st maxilliped drawn out, forming a fine ciliated stylet ; there is also one 

 lateral spine ; 2nd maxilliped (female) 3-jointed, with very short terminal spine ; 

 2nd maxilliped of male forms a chelate hand with very long rounded claw. Inner 

 branch of 4th pair of natatory legs 2-jointed, the outer branch equals 3 of the inner 

 and has truncated apex ; outer branch has 5 lanceolate spines. Furcal rami very 

 long and nearly parallel. 



About 20 females and 4 males were found in the Muttuvaratu pearl oyster 

 washings and in the Invertebrata washings. The mouth organs, antennal joints, and 

 the furca are the chief distinguishing features of this species, which is named in 

 honour of Mr. R. W. Ievers, Government Agent of the Northern Province of Ceylon, 

 where the pearl banks are situated. 



