290 CEYLON PEAKL OYSTER REPORT. 



Posterior antennae, mandible and palp, maxilla and maxillipeds and natatory legs 

 nearly as in C. graciUcauda. Fifth feet 2-jointed, 2nd joint slightly curved, long 

 and narrow, furnished with 2 sub-apical seta? on the outer margin, one sub-apical 

 seta on the inner margin and one apical seta, on each side of which there is a distinct 

 tooth-like projection of the foot. Abdomen narrow, 4-jointed. Genital segment 

 longer than the combined lengths of the 2nd, 3rd and 4th joints. Furcal rami 

 short and narrow, about 2i times longer than broad. 



Two specimens in the washings from Ceylon Invertebrates. 



This species is easily distinguished from the other members of the genus by the 

 lengths of the joints of the anterior antenna?, the shape of the 5th feet and the furca. 



We have much pleasure in naming the new Collocheres after Dr. Giesbrecht, 

 whose monograph on the Naples Copepoda belonging to this peculiar family has 

 done much to simplify their study. 



Scottocheres elongatus (T. and A. Scott). 

 Scottocheres longifurca, Giesbr. 



Both found in washings from Ceylon dredged Invertebrates. 



Lepeopsyllus, n. gen. 



Body oval, thin and scale-like, composed of 4 segments. Abdomen 3-jointed and 

 completely covered by the last thoracic segment. Furca completely covered or only 

 partly covered by the same segment. The margin of the carapace is thickly lined 

 with papilla-like prolongations, of irregular length, which probably impart strength 

 to this region. 



Siphon long, reaching to about the end of the last abdominal joint. Anterior 

 antennae 13-15-jointed. Outer branch of posterior antenna! 4-jointed ; inner branch 

 lone and blade-like. 



Mandible rudimentary, consisting of a long hair attached to a short slender basal 

 joint ; palp 2-jointed, the joints long and of about equal length, the outer one covered 

 with minute hairs. Maxilla consists of 2 separate lobes attached to the ends of a 

 long basal joint. Maxillipeds nearly as in the other Asterocheridae. 



Both branches of 1st to 3rd pairs of natatory legs 3-jointed; outer branch of 

 4th pair 3-jointed, the inner consisting of a minute knob with one hair; 5th pair 

 each consist of a long curved hairy appendage. Furca divergent, long and narrow". 



Lepeopsyllus typicus, n. sp. Plate XIX., tigs. 21 to 29. 



Length, female l - 48 millims. ; male unknown. 



Anterior antenna? 15-joiuted, the proportional lengths of the joints being as follows : 



1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. T . , . . 1 



Joint 12 bears a long nne nlament. 

 26. 13. 18. 5. 4. 5. 4. 4. 4. 4. 4. 5. 3. 4. 1. S 



