COPEPODA. 261 



lional lengths of the ioints being as follows : — '-— 1 — * „ , — --— — -—- They are 

 & J to 14. 20. 10. 11. 4. 5. 3. 10. J 



well clothed with setae on the. upper side. The 4th joint is produced and terminates 



in a long narrow filament. 



Posterior antenna? and mouth organs as in S. brevicomis. Natatory legs in general 

 similar to those of S. brevicomis, but the 1st pair differs therefrom in the respective 

 lengths of its joints ; the 5th pair is less triangular, the second joint being ovate. 

 Abdomen 5-jointed, about the same length as the cephalothorax, but only half the 

 width, and non-setiferous on posterior edges, Furcal rami about 4 times as long as 

 broad. 



One specimen only, a female, was found in the Muttuvaratu pearl oyster washings. 



The chief distinguishing features are the anterior antennae, the 1st and 5th natatory 

 legs, and the long narrow furcal rami. 



Stenhelia longicornis, n. sp. — Plate V., figs. 16 to 22. 



Length, female, - 8 millim. ; male, O'O millim. 



Cephalothorax similar to that of S. brevicomis. Anterior antennae 8-jointed, long 



and narrow, the proportional lengths being: _' : ' The 4th joint 



terminates in a long narrow filament ; the setae of the various joints as in 

 S. gracilicaudata. 



Posterior antennae and mouth organs and 2nd to 4th pairs of natatory legs as in 

 S. brevicomis. The 1st pair of legs agrees in form with S. gracilicaudata, as also 

 does the 5th pair in the female, with the exception of the spines of the inner joint, 

 which in this sjjecies are shorter, more numerous, and mostly plumose. The outer 

 joint has a pellucid circle, near the outer edge. Fig. 21 shows the inner branch of the 

 2nd pair in the male, and fig. 22 the 5th leg of the male, which is much smaller 

 than that of the female. 



Abdomen short and broad, the 4th joint having a short tooth on lower edge. The 

 furcal rami are very small, about half as long as broad. A few specimens of each 

 sex were found in the Muttuvaratu pearl oyster washings. The long narrow anterior 

 antennae, the 5th natatory legs, and the small furcal rami are the distinguishing 

 characters of this species. 



Stenhelia perplexa, n. sp. — Plate VI., figs. 1 to 7. 



Length, female, O'O millim. ; male unknown. 



Cephalothorax much resembles S. brevicomis. Anterior antennae 8-jointed, the 



1. 2. 3. 4. 5. 6. 7. 8. 

 proportional lengths of joints being as follows : 



Posterior antennae and mouth organs, with the exception of 2nd maxillipeds (fig. 3), 

 as in S. brevicomis. Natatory legs all more or less similar to those of S. longicomis. 



