COPEPODA. 253 



P. dance, which tapers gradually from the second to the posterior thoracic segment. 

 Rostrum nearly straight, length about double the width, and has bifid apex. 

 Fifth natatory legs asymmetrical, the left having outer and inner branches larger 

 than the right branches ; the outer one has a large and small spine on the outer side. 

 First joint of abdomen somewhat globular, whereas that of P. dance is more 

 quadrate. A number of specimens, all females, were found at 5 stations around 

 Ceylon. The 5th natatory legs and the shape of the abdomen serve to distinguish 

 the variety from P. dance, Giesbrecht. 



Pontellina plumata, Dana. 



Occurred at 17 stations, south of Gult of Suez, in the Indian Ocean, and round 

 Ceylon. 



Pontellopsis armata (Giesbr.). 



Occurred first between the Maldives and the Gulf of Manaar, and then at 

 9 Ceylon stations. Previously known from the Pacific and Indian Oceans. 



Pontellopsis krameri (Giesbr,). 



Occurred at 4 Red Sea stations. Giesbrecht's specimens were also from the Red 

 Sea. The species has been recorded from Fortescue Strait by A. Scott. 



Pontellopsis regalis, Dana. 

 The only specimen of this species was taken in the Mediterranean, near Messina. 



Pontellopsis strenua (Dana). 

 Found only at Cheval and Periya paars, Ceylon. 



Pontellopsis perspicax (Dana). 

 Like the last species, this was only taken on the Cheval and Periya paars. 



Pontellopsis herdmani, n. sp. — Plate II., figs. 15 to 17. 



Length, female 1*9 millims. ; male unknown. 



Cephalothorax about twice as long as its breadth, having 5 segments, the posterior 



segment terminating on each side with a triangular acuminated spine. Rostrum long, 



narrow, and bifid. Anterior antennae 16-jointed, the relative lengths of the joints 



, ,, 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 



being as follows : — 



23 6. 7. 5. 8. 3. 5. 3. 5. 5. 6. 9. 6. 6. 7. 6. 6. 



Posterior antennae, mouth organs and 1 to 4 pairs of natatory legs as in the other 



species of Pontellopsis. Abdomen about half the length of the cephalothorax, 



composed of 2 joints, the first being about double the size of the second and having 



2 thorn-like projections on the right side. Furcal rami twice as long as broad, with 



fine hairs on the inner surface and each terminating in 5 short non-plumose setae. 



