252 Mr. E,. I. Pocock 07i some 



rounded. The rest of the somites laterally striate, the uppsr 

 surface lightly striolate. The transverse sulcus shallow, the 

 pores immediately in front of it. Scobina absent. Anal 

 somite small ; tergite produced into a conspicuous, high, com- 

 pressed, apically upcurled caudal process ; valves very lightly 

 convex, their margins largely but not deeply compressed; 

 Bternite rounded. 



Le(js moderately slender, the distal segment with many 

 hairs beneath, the rest with only one. 



Number of somites 52. 



Length about 42 millim., width 4-3. 



Loc. Mah(5 Island, Seychelles [II.M.S. 'Alert'). 



Spiroholus Naresii, sp. n. (PI. XVI. figs. 4-4 h.) 



Closely allied to Sp. Goesii, but differing in colour and in 

 the form of the copulatory feet. 



Colour. Legs and antennaj flavous and contrasting strongly 

 with the slate-grey tint of the rest of the body ; the posterior 

 borders of the tergites ochraceous. 



Head, eyes, antennas, collum, anal somite, pores, &c. as in 

 Goesii ; the dorsal surface of the posterior portion of the 

 somites much less closely sculptured, with a transverse row of 

 ring-shaped or crescentic impressions just in front of the 

 sulcus. 



Number of somites 49-52. 



Length up to 40 millim., width 3. 



Loc. Mah^ Island, Seychelles [H.M.S. 'Alert'). 



Spirobolus Aoplurus, sp. n. (PI. XVI. figs. 5-5 h.) 



^ . Colour (in alcohol) . Head lightly fuscous above, flavous 

 beneath, first tergite and anal somite blood-red, rest of the 

 tergites black in front, with posterior third blood-red ; an- 

 tennae and legs flavous. 



Body slender, parallel-sided. 



Head striolate and convex above, flat and smooth below, 

 ■with two labral pores on each side. Eyes separated by a 

 space a little larger than a diameter, with inner border nearly 

 straight, composed of about six transverse rows of ocelli. 

 Antennce about as long as the head. 



First tergite smooth, produced laterally considerably below 

 the level of the second, narrowed, the anterior border and 

 angle evenly rounded^ with strong marginal sulcus ; the pos- 

 terior angle also rounded, the border above it emarginate. 

 The rest of the somites smooth, polished, the posterior half 

 slightly elevated and separated from the anterior by a shallow 

 groove, very faintly striate below. Pores about the middle 

 of the side, just in front of the transverse groove. Sterna 

 lightly striate transversely. Without scobina. 



Anal tergite produced above into a very long, straight, caudal 



