rjlEANTIATE rOLYOIIAETA OF JAP AX. 143 



two nearly symmetrical lobes, one in front and the other beliind 

 the vertical row of bristles. The lobes arc; low and slightly 

 pointed, and are directed ontward and slightly upward. Toward 

 tlie i)ostei'i()i' end of body these lobes liecome longer than parapo- 

 dium itself, i.(\, they increase in length, from before backward. 

 Nothing very diagnostic can be stated of the bristles or hooks 

 of this species, except perhaps the comparatively large size of 

 the liooks and the very distinct serration on their crown (fig. 

 ■2(1). 



Maxillae blackish brown in colour. The spathulate posterior 

 processes are broad, and their posterior ends are evenly rounded. 

 The left great dental plate with 5 teeth, and the right with 6. 

 The first lateral plate is narrow and ends in a lilunt tooth ; the 

 second plate is much larger than tlie first, with tlie inner edge 

 produced into a sharp tooth. A small accessory plate im- 

 mediately ])ehind is pale brownish, tlius contrasting w^ith the 

 rest of tlie apparatus. Mandibles are clavate, the anterior region 

 being broadly triangular and the posterior region forming slender 

 and ta|)ering shafts. The ventral surface of the mandibles is 

 somewhat semicircular, witli curved veins rumiing from side to 

 side. ( )ii each side of tlie median notch there is a tooth. The 

 sli'ilviiig ])()int is tlie downward curvature of the maxilla\ both 

 auf d'il )ily ami postoi'iorly, the elevation occuring just in front 

 1)1' I lie spailiiilafe ])()sterioi' process. 



Ilaliitat: Sagaiiii Jjay ; " Soiitheru shore of Japan'" ("Chal- 

 lenger *"). 



(ieniis Lavandff Iviiilierg. 



Prostomiinn without ap})endage, aiitei'iormost two segments 

 laek |>ara|)0(li;i. Pai'ajxxliinu with rouii<led lolu.' and simpk; 



