BY L. HARRISON. 627 



Until the existing* descriptions of European and American Eury- 

 pauropodidce are verified and amplified, it is little use attempting 

 to discuss the affinities of the species here described. As Hansen 

 has pointed out, if Ryder's and Latzel's descriptions are correct, 

 this species, together with that which he describes without naming, 

 will have to be transferred to a new genus. 



Types of the five species, described as new, have been deposited 

 in the Australian Museum, Sydney. 



Development of Pauropus amicus. 



The first eggs seen were laid by females captive in tubes, but I 

 was later able to find them in the field. In both cases, the eggs 

 were laid in groups of from twelve to twenty-four, loosely attached 

 to pieces of bark, apparently by some sticky secretion of the ovi- 

 ducal walls. 



The egg is perfectly spherical, pearly white, and 017 mm. in 

 diameter. Under low power, the outer membrane, which is opaque, 

 appears covered with minute pustulations. These, under a higher 

 magnification, show as short, flat-topped, cylindrical processes. No 

 sections have been cut, but observations made while the eggs were 

 passing through fixing fluids, would appear to indicate that the 

 embryonic development resembles that of the Diplopoda. The 

 egg proper, which has, after fixation, only two-thirds of the dia- 

 meter of the outer membrane, shows, in iodised alcohol, an appear- 

 ance of total segmentation, but no nuclei are visible at the surface, 

 so the areas probably represent yolk-pyramids. At a later stage, 

 a distinct ventral flexure is observable. At the twelfth day, the 

 outer membrane breaks, and the embryo bursts out in part, its 

 anterior end being free, while the posterior end is still enclosed in 

 the membrane. The embryo is covered by an embryonic membrane, 

 which bears outgrowths covering the antennae only ; the three pairs 

 of legs, though visible inside, making no impression on this second 

 cuticle. The cuticle is covered with long, tapering, cylindrical, 

 hair-like outgrowths; and is definitely segmented, the segments 

 being more numerous than the apparent somites of the hexapod 

 larva, and showing no trace of fusion. The embryo remains motion- 



