262 W. B. BENHAM. 



No tubercula pubertatis. 



[The worm is aquatic in habit; in colour^ brownish green. 



In the breeding season one or more " spermatophores " are 

 found fixed to the body in the neighbourhood, and in front, of 

 the genital pores. 



Cocoons spindle-shaped, dark green. 



The anus is dorsal. 



Genital apparatus as in AUolobophora; the male duct 

 passes through a glandular thickening of epidermis situated 

 around the aperture. 



No spermathecse. 



No gizzard and no oesophageal glands are present. 



The typhlosole, frequently denied, is present. 



The nephridia commence in Somite x (according to Collin, 

 Zeit. Wiss. Zool.,' xlvi, 1888). ] 



Species ]. C. lacuum, Hoffm., 1845; Europe. 



See Benham, 'Quart. Journ. Micr. Sci.,' xxvii; Orley, 'Quart. 

 Journ. Micr. Sci.,^ xxvii; Rosa, ' Sul Criodrilus lacuum,^ Torino, 

 1887. 



Genus 32. Allurus, Eisen ( =: L. tetraedrus, Duges). 



Prostomium partially dovetailed into the peristomium. 



Setae in four couples, latero-ventral and latero-dorsal in 

 position. 



Clitellum occupies Somites xxii to xxvii. 



Spermiducal pores on Somite xm, lateral in position. 



Sperm-sacs as in AUolobophora; sperm-duct opens 

 through a glandular thickening of epidermis as in Criodrilus. 



[Body posteriorly quadrangular. 



Spermathecae minute sacs (visible only in sections) in 

 Somite viii; aperture not intersegmental, but close to the 

 lateral setae. 



Gizzard in Somite xvii. 



Small oesophageal glands in Somites x — xiv, not very distinct. 



The nephridia commence in Somite iv. 



First dorsal pore between Somites iv and v.] 



