SEGMENTATION OF CERTAIN POLYCH^TES. 



533 



Segments 



-41 are also irregular on the dorsal surface in tli 



is speci- 



2 When the same specimen has more than one kind of irregularity it occurs 

 more than once in the list, but is referred to by the same number. 



^ The spiral in this specimen is interrupted in the middle by the irregularity 

 in Segments 35 — 41. 



