110 



seem to exhibit differences of more than specific value. In any case, the species 

 described below, as the first one recorded, ought to be regarded as the type of 

 the genus Acontiophorus. 



Gen. 25. ACOntiOphOFUS, Brady 1880. 



Syu: Soknostoma, Brady (preoccupied). 



Generic Character*. Anterior division of body moderately dilated, not 

 depressed. Epimeral parts of the trunk-segments not produced, but evenly rounded 

 off. Tail composed in female of 3, in male of 4 segments, none of them pro- 

 duced at the postero-lateral corners. Caudal rarni of moderate size, and trans- 

 versely truncated at the end, apical setse well developed. Anterior antennae very 

 short, with the number of joints considerably reduced ; those in male imperfectly 

 hinged, and provided with supplementary sesthetasks. Posterior antennae with the 

 terminal joint rather large and scarcely narrowed distally, outer ramus attached 

 close to the end of the 2nd (basal) joint, and cylindrical in form. Siphon 

 exceedingly slender and elongated. Maxillse . with the inner lobe larger than the 

 outer, and carrying on the tip 4 setse, the 2 inner of which are densely plumose. 

 Maxillipeds quite normal. Natatory legs with the rami comparatively slender and 

 subequal in length; their armature resembling that in the gen. ScottocJieres. Last 

 pair of legs very small ; distal joint provided with 5 rather unequal setse. 



Remarks. The above-given generic diagnosis chiefly refers to the type 

 species A. scutatus. The other species referred to this genus, A. ornatus, differs 

 more or less in some of the characters here 'given, and should in my opinion, 

 as noted above, more properly be removed to a separate, though closely-allied genus. 



63. Acontiophorus seutatus, Brady. 



(PI. LXVII). 



Ar<i>itii>1it->riis scutatm. Brady. Mouogr. of British ( 'upepoda. Vol. III. p. H9. I'l. XC. %s. 1 10. 



Syn: Solenostoma scutatwn, Brady & Roberts. 



Specific Characters. Female. Body moderately slender, obpyriform in 

 shape, with the anterior division broadly ovate, greatest width considerably ex- 

 ceeding half the length. Cephalic segment very large, occupying nearly half the 

 length of the body, and quite evenly rounded in front; rostral projection extremely 

 small, almost obsolete. Tail scarcely exceeding in length 1 / 3 of the anterior 



