1893.] Embryology. 149. 
disappearance of most of the abdominal appendages there is still a 
retention of the posterior ones to form the ovipositor. The author 
makes out a clear case for the belief that this structure is formed from 
two or three pairs of real limbs. 
The reproductive organs thus show resemblances to those of anne- 
lids, not only in the marked metameric character of the gonads, or 
clusters of cells on the ccelomic walls, but also in the fact that the ducts 
arise as coelomic diverticula, since these diverticula may be homolo- 
gized with nephridia by the aid of the condition of things probably 
existing in Peripatus. 
50 
