20 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.72 



MITOCYBE AUKIPORTAE, new species 



Segments variable in number, two males have 52 and 64 segments 

 and four females have 80, 84, 108, and 110 segments; the specimens 

 ranging in length from 14 mm. to 44 mm. and in width from 0.8 mm. 

 to 1.6 mm. Dorsum evenly convex without flattened or depressed 

 lateral carinae. 



Color creamy white in living animals, suggesting a resemblance to 

 some species of Siphonophora. 



Head turned back under the body but not covered by the first seg- 

 ment, cordate; the labral region bluntly rounded; vertex slightly 

 inflated on the sides above the base of the antennae ; surface pilose, 

 with longer hairs on the sides of the front; antennae short and thick, 

 clavate, pilose; bases remote; joints increasing in thickness to joint 6; 

 joint 2 longest; joint 3 equal in length to joint 7; joint 5 broader 

 than long. i 



First segment subreniform, slightly emarginate in front; anterior 

 margin raised; angles abruptly rounded; no impressed median line; 

 surface evenly covered with fine, erect hairs. 



Following segments with the anterior subdivisions glabrous; with 

 a very fine raised median line from which four or five annual folds 

 bend sharply back and then proceed around the segment, the folds 

 intersected by many fine impressed lines. Posterior subsegments 

 evenly convex ; the lateral carinae thickened instead of being flattened 

 or depressed; median sulcus present, broader and deeper in front 

 than behind ; surface with fine, erect short hairs rising from minute 

 punctations which give the dorsum a granular appearance, the pubes- 

 cence more abundant on the lateral carinae. Lateral margins of 

 carinae parallel; front angles abruptly rounded; anterior margin of 

 the subsegment with a broad, shallow emargination between the an- 

 gles ; hind angles rounded on several of the anterior segments, slightly 

 produced backward ; more strongly and sharply produced on the last 

 few segments; hind margin of all segments rounded except on the 

 last few segments which are broadly emarginate behind. Eepugna- 

 torial pores on the caudal angle of the carinae, surrounded by a 

 narrow margin. 



Last segment rather long, hood-like, the hind margin truncate, 

 slightly exceeded by the small inflated and sparsely pilose anal 

 valves; insertion of valves round; preanal scale present, compara- 

 tively large, elliptic, sparsely hairy. 



Legs short and slender, not attaining the sides of the body; the 

 large produced oval lobe of the sterna separating the coxae; coxal 

 joint twice as thick as the others and with a pore near the end on 

 the inner and posterior face; joint 2 very short and closely applied 

 to the coxa; joint 3 as long as 7; joints 4, 5, and 6 subequal in 



