244 W. B. BENHAM. 



The nephridia do not commence till Somite xv; the pores 

 are in line with the second seta. The " duct " of the nephri- 

 dium is feebly marked. 



There is no gizzard^ no typhlosolCj no subneural vessel, no 

 dorsal pores. 



[Found on the sea-shore. 



Two pairs of spermathecfCj which have small appendices in 

 Somites viii and ix, opening anteriorly.] 



Species 1. P. littoralis, Grube, 1855 ; Villa-Franca. 

 2. P. marionisj E. P., 1874; Marseilles. 



See Perrier, 'Arch. d. Zool. Exp. et Gen./ ix, 1881. 



Genus 16. Photodrilus, Giard, 1887 (=Lumbricus 

 phosphoreus, Duges). 



The eight setse are separate. No. 1 seta is near the middle 

 line. 



Clitellum on Somites xiii to xvii. 



The male pores on Somite xviii. There are ^^penial" 

 setse in this somite, and anterior penial setae in Somites xii 

 and XIII. 



Genital organs as in previous genus. 



The nephridia commence in Somite xiv; the pores are in 

 a line with the second seta. 



There is no gizzard, no typhlosole, no subneural vessel. 



[One pair of spermathecae in Somite ix. 



The prostomium does not encroach on the buccal somite. 

 " Septal glands'*^ in Somites v to ix, probably open dorsally. 



Four oesophageal swellings in Somites x to xiii. 



Small, transparent, rose-coloured worm, clitellum orange ; 

 phosphorescent.] 



Species 1. P. phosphoreus. Dug., 1837; Europe. 



See Giard, ' Comptes Rendus,' 1887 ; Rosa, ' Boll. Mus. 

 Zool. ed Anat. Comp. Univ. Torino,^ iii, 1888. 



Genus 17. Microscolex, Rosa, 1887. 

 The setse in four couples; those of outer couple further 

 apart than those of the inner couple. 



