H. M. Morris 97 



is about four times the size of those on the third to tenth segments 

 (Text-figs. 2 and 3, p. 110). 



The first segment (Plate II, fig. 1) is divided dorsally into two slightly 

 raised areas, of approximately equal size, by a transverse groove. On 

 the first of these areas are six processes, arranged in a transverse row, 

 those towards the sides being about twice as long as those in the centre. 

 The ventral side is similarly divided into three areas, of which the second 

 is below the first dorsal area, but is curved back in front, and a smaller, 

 roughly triangular, area is formed in front of it, on which are two short 

 processes. On the second area are two short processes in the centre, 

 one about four times as long on each side, and one on each side of inter- 

 mediate length between those at the sides and those in the middle. On 

 the third raised area are six processes of which the longest, at the sides, 

 are as long as the intermediate ones on the second area. The spiracle 

 on this segment is situated laterally and slightly farther back than the 

 second row of spines on the dorsal side, and projects from the side a 

 distance equal to its own diameter. 



The second segment is divided dorsally into three areas in the same 

 manner as the first segment. Of these areas the first bears a process 

 on each side, and the second a row of six processes. Ventrally the same 

 division is visible, the first area bearing two central processes, and the 

 second a row of six processes. 



The third segment is similar to the second, but bears a pair of spiracles 

 laterally on the front part of the first raised area. 



The fourth segment is also divided into three areas, and bears on the 

 front of each side of the first raised area a spiracle, and on the middle 

 area a transverse row of six processes. Ventrally, it has a row of six 

 processes on the first area, and another row of six processes on the 

 second ; the two lateral processes of the latter row appearing behind and 

 a little below the spiracle. 



The fifth to tenth segments are similar to the fourth. 



On the eleventh segment the row of six dorsal processes are much 

 enlarged ; of these, the middle pair are the largest and the lateral ones 

 one- third the size. About the middle of the ventral side of this segment 

 is a row of six processes similar to those on the preceding segments. 

 There is also a lateral process on each side half-way between the dorsal 

 processes and the front edge of the segment (Plate II, fig. 4). 



The four processes on the dorsal side of the tweKth segment are also 

 much enlarged, and are situated on the hind margin of the segment. 

 There is, furthermore, a short process on the middle of the side of the 



