370 ARTHUR DENDY. 



of a proximal portion with little pigment and no papillae, bnt 

 pleated transversely and capable of extension, like an 

 accordion ; and a distal pigmented portion, almost hemi- 

 spherical in form, and bearing papilla. 



The jaws, also, are quite normal in structure. The outer 

 blade has an accessory tooth at the base in 0. oviparus 

 (figs. 7, 8), but this tooth is extremely small and irregular, 

 while in 0. iusignis and 0. viridimaculatus (figs. 29, 34) 

 there is no accessory tooth. The inner blade (figs. 7, 30, 35) 

 has from about fi.ve to about eight accessory teeth. 



The ringed antennae have no special characteristics as 

 compared with other species. They are broadly rounded, 

 or even perhaps slightly club-shaped at the extremity, and 

 very similar, as is the case also with the oral papillae, to 

 those which Sedgwick has figured for P. novas-zealandife. 



External Apertures. — The mouth with its tumid lips, 

 tongue, and jaws ; the terminal anus ; the apertures of the 

 slime-glands and the nephridial apertures (fig. 28) resemble 

 closely the corresponding parts in other Ouychophora. In 

 the fourth and fifth pairs of legs the nephridial aperture is 

 shifted outwards into about the middle of the narrow 

 proximal spinous pad, which is thus divided transversely 

 into two parts, separated by the nephridial papilla. 



The genital aperture of the female is a longitudinal slit 

 at the extremity of a very protrusible ovipositor (figs. 9, 10, 

 27, 31) placed between the legs of the last pair. The 

 ovipositor when retracted is still a conspicuous organ ; its 

 shape is subcylindrical, bluntly rounded, and may be 

 slightly enlarged at the extremity, and covered, at any rate 

 distally, with small spinose papillee of a yellowish colour. It 

 is capable of being extended until two or three times the 

 length of the legs, and in this condition I have seen it in a 

 drowned specimen (fig. 10) of 0. oviparus, in which it was 

 4 mm. long. It is of about the same size and sliape in all 

 three species. 



The male genital aperture lies between the legs of the last 

 pair, and is only slightly prominent. 



