MYRI0P0DA OF THE MERGE! ARCHIPELAGO. 



299 



First dorsal plate laterally narrowed, not projecting below the 

 second ; anterior border merging almost imperceptibly with the 

 lateral ; not striated ; marked with marginal sulcus. 



Lower portion of clypeus with a longitudinal median sulcus, 

 upon each side of which are two widely separated punctures. 



Last somite produced into a blunt process, which scarcely 

 projects beyond the margins of the anal valves. Margins of anal 

 valves very slightly compressed, convex. Sub-anal plate triangular. 



Anterior lamina of copulatory organ is more or less quadrate, 

 and is attached to that of the opposite side by a couspicuous trian- 

 gular piece ; each of the upper angles of the triangular piece is 

 produced into a long process which curves over the upper end of 

 the semiquadrate lamina; the anterior lamina is on each side 

 extended backwards and comes into contact with the posterior 

 lamina, which itself, more or less quadrate, forms the posterior 

 wall of the channel in which lies the central foot-lamina. 

 Attached to the upper margin of the anterior lamina and pro- 

 jecting backward from it, there is a simple slightly curved rod, 

 with the posterior extremity of which articulates the central 

 lamina. This consists of a stout piece, with sm^joth^carved 

 rounded anterior border, blunt distal end, and with inner and 

 hinder borders membranous and excavated. In the lower 

 portion of the excavation lies a curled pointed flagellum. 



Four specimens, two males and two females, from King Island, 

 and Owen Island. 



The female of this species, described from Bangkok, has 

 hitherto only been known. 



Spirobolus Andersoxi, sp. nov. (Plate XXV. figs. 5-5 d.) 



Length of large specimen 52 mm. Number of somites 55. 



Anterior and posterior portions of each somite testaceous ; 

 central portion slate-coloured ; legs, margins of first dorsal plate, 

 antenna?, and region of labrum testaceous. Each somite divided 

 by two circular sulci into three parts. Foramen repugnatorium 

 situated between the middle and posterior divisions ; middle and 

 posterior divisions strongly striated at the sides : dorsally marked 

 with scattered crescentic impressions ; posterior portion finely 

 striated longitudinally. Entire somite finely punctured. The 

 crescentic impressions form a well-marked line running parallel 

 with the margins of the somite ; this line is fainter upon the 

 posterior than upon the anterior somites. 



LI>'X. JOUBJT. — ZOOLOGY, VOL. XXI. 25 



