Cyliiichoiuliis (r.eucoiulii.<) nitidns (Verhoejf). 



421 



(d) Ocelli. 



Dr. Verlioeff dwells upon tlie great interest of tlie ocelli in 

 this species, and states tliat this character provides an inter- 

 mediate condition between Ummatuiulus and AUaiulus. The 

 external surface of the field of the eye is not broken up by 

 the convexities of the individual ocelli, and with some illumi- 

 nations the microscope reveals the fact that the field is quite 

 smooth. With some illuminations it is impossible to see the 

 individual ocelli, with otliers they are quite distinctly visible. 



Ocelli arrangement (1915 material) : — 



In a J of 14 mm. : 4, 5, 6, 5, 3, 2 (25). In curved rows, somewhat 



irregular. 

 In a c? of 20 mm. : 3, 5, 6, 6, 4, 4, 2, 1 (31). Irregular. 

 In a (5 of 14 mm. : 3, 4, 6, 5, 4, 1 (23). Irregular. 

 In an immature specimen: o, 4, 3, 2, 1 (15). Fairly regular, 

 do. do. : 4, 3, 2, 1 (10). do. 



It will be seen that there is great variation in the number 

 of individual ocelli. This is also noticed in Dr. Verhoeff's 

 description, where lie records from 26—40 ocelli in different 

 s])eciniens. As in the case of the walking-legs, the greater 

 number appear to occur in the more mature specimens. 



Fiof. 4. 



Fic 



Fig. 3.— First leg of male of C. nitidus. x 1-10. H. K. B. del. 

 Fig. 4. — Second leg of male, with segments numbered, s, secretory 

 organ (penis), x 140. H. K. B. del. 



3. Modified Appendages of the Male. 



The first pair of legs are hook-shaped, forming an angle 

 at the outer bend as the tip turns inwards, and a small 

 prominence is present at this angle (fig. 3). The second pair 



