280 Part III. — Twenty -fourth Annual Report 



is provided with six setae, which are arranged as follows : — One small seta 

 on the upper half and another on the lower half of the outer margin and 

 situated considerably apart, and four setae round the distal extremity; the 

 outermost and innermost seta is moderately large and plumose, but the 

 two intermediate ones are small and close together (fig. 28) 



Furcal joints as long as the last abdominal segment (fig. 29). Ovisacs 

 two. Only three specimens — all females — were obtained. 



Remarks. — This species, as already stated, has some resemblance to 

 Diosaccus tenuicornis, Claus, but the structure and armature of the 

 mandibles, maxilhe, and fourth pair of thoracic legs are so distinctly 

 different that though the species was at first ascribed to that genus it 

 cannot be retained there, and a new genus, Pseudodiosaccus, has therefore 

 been instituted for its reception, as indicated above. This genus appears 

 to partake of the characters of both Diosaccus and Amphiascus, but in the 

 structure of the fourth pair of thoracic legs it agrees with neither of these 

 two genera. 



It resembles Diosaccus in the structure of the posterior antennae, of the 

 mandible palp, and to some extent in the structure of the first and fifth 

 pairs of thoracic legs; while in the maxillae, second maxillipeds, and the 

 second and third pairs of legs it resembles Amphiascus. 



PLATE XIV. 



•Amphiascus Catharincc, T. Scott. 

 Fig. 1. Female, side view. 

 Fig. 2. Antennule. 

 Fig. 3. Antenna. 

 Fig. 4. Mandible. 

 Fig. 5. Posterior foot jaw. 

 Fig. 6. Foot of first pair. 

 Fig. 7. Foot of fourth pair. 

 Fig. 8. Foot of fifth pair. 

 Fig. 9. Abdomen and furcal joints. 



Dactylopusia brevicornis, Claus. 



Fig. 10. Female, dorsal view. 



Fig. 11. Antennule. 



Fig. 12. Antenna, 



Fig. 13. Mandible. 



Fig. 14. Posterior foot-jaw. 



Fig. 15. Foot of first pair, 



Fig. 16. Foot of fourth pair. 



Fig. 17. Foot of fifth pair. 



Fig. 18. Abdomen and furcal joints. 



Pseudodiosaccus propinquus, T. Seott. 



Fig. 19. Female, side view. 



Fig. 20. Antennule. 



Fig. 21. Antenna. 



Fig. 22. Mandible. 



Fig. 23. Maxilla. 



Fig. 24. Posterior foot-jaw. 



Fig. 25. Foot of first pair. 



Fig. 26. Foot of second pair. 



Fig. 27. Foot of fourth pair. 



Fig. 28. Foot of fifth pair. 



Fig. 29. Abdomen and caudal furca. 



