280 Part III—Twenty-fourth Annual Report 2 
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is provided with six setee, 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 sete 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, maxillz, 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 antenne, of the 
mandible palp, and to some extent in the structure of the first and fifth 
pairs of thoracic legs; while in the maxille, second maxillipeds, and the 
second and third pairs of legs it resembles Amphiascus. 
PLATE XIV. 
Amphiascus Catharine, 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. 
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. Scott. 
Fig. 19. Female, side view. 
Fig. 20. Antennule. 
Fig. 21. Antenna. 
Vig. 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. 
