117 



coast of Norway, from a depth of about 20 fathoms. I have, however, not met 

 with it in other localities, and it thus seems to be of very rare occurrence. 

 Distribution. Scottish coast (Scott). 



Fam. 7. Dyspontiidae. 



Characters. General form of body, as a rule, very broad and depressed, 

 with the anterior division much expanded. Cephalic segment large and arcuate 

 in front, with the postero-lateral corners produced, and the pleural parts very 

 broad, leaving in front only a narrow space for the insertion of the antennae and 

 oral parts. Epimeral parts of the trunk-segments forming well-defined lappets 

 projecting laterally. Last segment, however, as usual, not expanded and very 

 small. Tail comparatively short, and composed in female of 4, in male of 5 

 segments; genital segment much expanded in its anterior part. Anterior 

 antennae slender and narrow, with the number of joints more or less reduced, 

 last joint club-shaped and carrying near the end the usual aesthetask; those 

 in male more or less distinctly hinged and provided with supplementary 

 sesthetasks. Posterior antennae very small, 4-articulate, outer ramus rudimentary. 

 Oral cone generally much produced. Mandibles without any palp, masticatory 

 part slender styliform, extending to the end of the siphon. Maxillae with both 

 lobes very narrow, the inner one the larger and generally provided with only a 

 single apical seta, outer lobe with 2 such setae. Both pairs of maxillipeds very 

 fully developed. Natatory legs more or less incurved, with the rami compara- 

 tively slender, the inner one in 4th pair more or less reduced, in some cases 

 wholly wanting. Last pair of legs extremely small and rudimentary, being only 

 represented by a minute knob-like joint accompanied outside by the usual seta. 



Remarks. The present family does not quite answer to the sub-family 

 Dyspontiince of Giesbrecht, in which the 2 preceding genera are also included, 

 as also 2 other genera which I have felt justified in removing, viz., the genera 

 Artotrogus and Dystroyus. In the restriction thus adopted, the family Dyspon- 

 tiidce forms a very natural group, comprising a number of genera, which agree 

 pretty well in the more essential characters. In addition to the 5 genera treated 

 of in the following pages, the 2 genera Pteropontiits and Sestropontius, estab- 

 lished by Giesbrecht, belong to the present family, which thus at present comprises 

 no less than 7 different genera. 



