138 CANON A. M. NOEMAN ON 



2nd niaxilllpeds with the hand narrow elongated ovate ; claw long and very slender. 



1st feet having the 2nd hasal joint narrow and fully twice as long as broad. Inner 

 ramus is slender throughout, 1st articulation has both margins setose ; outer ramus is 

 2-jointed, the 1st Trith a single seta on the outer margin and the 2nd with five. 



Mh feet having inner ramus less than half the outer, scarcely exceeding the 1st joint 

 of the outer in length ; its 1st joint has one interior seta and the 2nd carries five setae. 



5th feet having an inner expansion of the 1st joint bearing two setae, and nearer the 

 attachment another seta. The outer lobe of the basal joint bears the usual seta. The 

 2nd joint is remarkable, as compared with other species of the genus, for its great length, 

 being six times as long as broad, and is furnished with two seta? at its outer base, three 

 setae towards the termination, and terminates in a simple seta. 



Size "8 mm. 



The specimen here described was dredged in Lamlash Bay, in the Firth of Clyde, in 

 July 1885. 



The species is characterized, first, by its 6-jointed antennae ; second, by the outer 

 branch of the 1st feet consisting of only two joints; third, by the peculiar form of the 

 bulbous caudal rami ; fourth, by the structure of the 5th feet. This peculiar 5th foot 

 finds its counterpart in Luoplionte elongata, Boeck, and Laophonte typhlops, G. O. Sars. 



Family Ancorabolid^, G. O. Sars. 



" Body slender, tapering behind, with no sharply marked boundary between the 

 anterior and posterior divisions. All the segments very sharply defined and, excepting 

 the last 2 or 3, produced to peculiar horn-like projections, either dorsal or lateral, or 

 both dorsal and lateral ; cephalic segment somewhat flattened in front, with the antero- 

 lateral corners generally produced ; rostral projection of varying shape in the different 

 genera, in some cases wanting. Genital segment imperfectly subdivided in female. 

 Caudal rami long and slender, with one of the apical setae much elongated. Eye wholly 

 absent. Anterior antennas with the number of joints much reduced, terminal part (in 

 female) uniarticulate. Posterior antennas without any trace of an outer ramus. Oral 

 parts poorly developed, but, on the whole, of normal structure. Natatory legs slender 

 and projecting more or less laterally, 2nd basal joint obliquely produced ; 1st pair 

 generally differing in structure from the others, but never prehensile. Last pair of legs 

 with the distal joint long and slender, proximal joint generally produced outside to a 

 long narrow process tipped with a slender bristle. A single ovisac present in the female." 



The above is Sars's description of the family which he has created. In it he has placed 

 four genera, each of a single species. Of these I was previously acquainted with two — 

 Ancorabolus and Arthropsyllus. It is this latter genus which in my description of 

 Ancorabolus I mentioned as " a second species " of the same genus taken at the same 

 time as Ancorabolus mirabilis. 



The most remarkable character appears to consist in the form of the feet, which 

 have the second basal joint produced outwards to a considerable extent, so that the 

 attachments of the two branches are a considerable distance apart, and the inner branch 



