AN ATTEMPT TO CLASSIFY EARTHWORMS. 227 



Genus 6. Dichogaster, Beddard, 1888. 

 Setse in couples; ventral setse absent in Somites xvii, 



XVIII, XIX. 



C lit ell urn on Somites xiii to xx; more feebly developed 

 ventrally. 



Spermiducal pores on Somite xvii ; no penial set». 



Two pairs of prostate-pores on Somites xviii, xix. 



Sperm- sacs. — Three pairs in Somites x, xi, xii, connected 

 across the middle line both above and below the intestine. 

 Testes and ciliated rosettes in Somites x and xi, enclosed in 

 sperm-sacs. 



Prostates tubular, slightly coiled, in Somite xvii. 



Additional club-shaped prostates, two pairs in Somites xviii 

 and XIX, without connection with sperm-ducts. 



Two gizzards, each occupying two Somites, vit, viii, and 



IX, X. 



[Dorsal pores are present. Only one pair of spermathec^ 

 in Somite viii ; aperture near ventral mid-line. 

 Calciferous glands in xv, xvi, xvii.] 



Species 1. D. damonis, F. E. B., 1888; Fiji. 

 See Beddard, ' Quart. Journ. Micr. Sci.,' xxix. 



Genus 7. Digaster, E. P., 1872. 



The setae in four couples. 



The clitellum on Somites xiv to xvii, complete ventrally, 

 though not so well marked as on the dorsal surface. 



The male pores on Somite xviii (xvii, Perrier). 



Penial setse present. 



Sperm-sacs in Somites ix, xii (or x, xi, Perrier). 



Prostates lobulated. 



Two gizzards in Somites v and vii. 



In Somites v and vii nephridia in groups, forming "pepto- 

 nephridia," the duct of which opens into the pharynx. 



Nephridia tufted; though apparently, according to 

 Fletcher, large ones are present in addition. 



Dorsal pores are present. 



