246 W. B. BENHAM. 



and four except anterior four pairs, which open in front of 

 third seta; nephridia simple, slightly coiled tubule, lying 

 entirely within one somite (?). 



The sperm-sacs in Somite xii. 



Prostate tubular, convoluted. 



[Spermathecse. — Five pairs, in Somites v to ix ; very small, 

 with coiled diverticulum. 



Ovary in Somite x (?). 



Gizzard in Somite vi ; oesophageal glands in Somites x, xi, 



XII. 



The dorsal pores begin behind Somite vi. Lateral hearts 

 in Somites x, xi, xii.] 



Species 1. P. heteroporus, E. P.; Pennsylvania. 

 See Perrier, ' Arch. d. Zool. Exp. et Gen.,' ii, 1873. 



Remarks on Eudrilidse. 



I have here united with the peculiar genera Eudrilus and 

 Teleudrilus a number of other genera which are much more 

 normal in the arrangement of their genital organs than are 

 these two; fori think, with Rosa, that Eudrilus need not 

 form a type of a separate family. 



It is only lately that we have had a thorough description of 

 the female genital organs of Eudrilus; and though from 

 Perrier's descriptions, and the earlier ones of Beddard, it 

 appeared as if we had to do with a very abnormal type, Bed- 

 dard's more recent papers on the subject, and Rosa's descrip- 

 tion of Teleudrilus, remove some of the apparent peculiari- 

 ties. But they both remain very different from other worms, 

 in that the ovary is not freely dependent in the coelom, but 

 enclosed in a sac, the walls of which are continuous with those 

 of the oviduct ; a similar condition of things is present in 

 Microchseta in regard to the testis. And no doubt both these 

 cases are in reality similar to the enclosure of the testes and 

 rosettes in a common sac in Lumbricus and other forms. 

 Here, however, the portion of coelom separated by the wall 

 of the sperm-sac is very considerable, whereas in the case 

 of the ovary of Eudrilus and the testis of Microchseta, 



