COPEPODA. 273 



legs are very small and distinctly 2 -jointed. Anterior antennae 6 -jointed ; pro- 

 portional lengths as follows : — : '- — '■—-— ' 



^ & 9. 12. 21. 4. 7. 7. 



Posterior antennae, mandible, maxilla and maxillipeds similar to those figured by 

 Brady. Natatory legs 1 to 4 also similar. The 5th legs have a large primary 

 joint and a small secondary joint each furnished with a number of hairs. 



Furcal rami extremely short, much broader than long. 



Harpacticus chelifer (Muller). 



A common littoral British species. It occurred only once, in a tow-net gathering 

 from Marichchukaddi, Ceylon. 



Peltidium ovale, n. sp. —Plate XIII., figs. 1 to 6. 



Length, female 1*6 millim. ; male unknown. 



Body ovate, cephalothorax. and abdomen not clearly separated. Anterior antennae 



short, 6-jointed, the proportional lengths of joints being as follows : ' 



Most of the joints are densely setiferous, the 3rd and 4th also bearing a long 

 filament. 



Posterior antennae and mouth organs as in P. purpureum. Outer branch of 

 1st pair of natatory legs 2 -jointed, with marginal hairs on both sides ; inner branch 

 3-jointed, half as long again as the outer, the middle joint about twice the length of 

 the 1st, and the 3rd joint very small, having at the apex two narrow curved claws. 

 In the 2nd, 3rd, and 4th pair, both branches are 3-jointed, the outer branch armed 

 on outer side with lateral aculeate plumose spines ; the inner side and inner branch 

 both bearing plumose setae. The 5th pair of legs 2 -jointed, the basal joint very small 

 and produced on each side ; the outer joint long and stout, with terminal aculeate 

 spines. 



Three females only were found in the Muttuvaratu pearl oyster washings and in the 

 general washings of Invertebrates. This and the 4 following species all clearly agree 

 with Philippi's original description of the genus except as to the anterior antennae, 

 which he gives as 9-jointed, whereas our 5 new species are 6- and 7-jointed. Seeing 

 that Philippi knew of only one species, P. purpureum, we think the generic character 

 should be altered to read — 6- to 9-jointed, to admit these new forms. 



The rounded forehead and the 5th pair of natatory legs sufficiently distinguish this 

 species from the others. 



Peltidium angulation, n. sp. — Plate XIII. , figs. 7 to 11. 

 Length, 1*2 millim. ; male unknown. 

 Body angular, with large anterior protuberance or rostrum. Anterior antennae 



7-jointed, the proportional lengths being as follows : ' 



2 N 



