AN ATTEMPT TO CLASSIFY EARTHWOEMS. 247 



this separated coelomic space is smaller, and has appeared more 

 peculiar than it really is. As above mentioned, Eudrilus 

 possesses two pairs of ovaries according to Beddard, the 

 posterior pair serving apparently as ovisacs. 



Rosa has already pointed out the close relation between 

 Pontodrilus, Photodrilus, and Microscolex. These 

 three forms serve to show the invalidity of Claparede^s charac- 

 teristics of '* Terricolse." The absence of a gizzard is, no 

 doubt, connected with the character of the food. 



Plutellus is altogether a peculiar foi-m; the only descrip- 

 tion we have of it is that by Perrier. The position of the ovi- 

 ducal pore and of the ovary is so abnormal that a renewed 

 examination is desirable. 



2. Setae more than eight (30 — 40) per somite. 



Family VI. Perionycidae. 

 Genus 20. Perionyx, E. P., 1872. 

 Setae thirty to fifty per somite. 



Prostomium dovetailed incompletely into peristomium. 

 Clitellum on Somites xiv — xvii or less, complete ven- 

 trally; intersegmental grooves not completely obliterated. 

 Male pores close together, in a depression on Somite 



XVIII. 



Oviducal pore median, in Somite xiv. 



Prostate flattened, rounded; its pore common with the 

 spermiducal pore. 



[Genital organs as in Peri eh set a, but without a median 

 sperm-sac. 



Gizzard in Somites vi and vii ; no ca^,ca or other diverticula 

 of the canal. 



Nephridia large, paired; the duct not provided with a 

 caecum; apertures irregularly arranged in some species, as 

 in P. saltans.] 



Species 1. P. excavatus, E. P., 1872; Cochin China, the 

 Philippines, and Burmah. 



2. P. Mclntoshii, F. E. B., 1883; Burmah. 



3. P. saltans, A. G. B., 188G; India. 



