92 Mr. F. E. Beddard on the 



12, the testes in the two former, and the ovaries in the latter 

 segment. As compared with Phreoryctes, therefore, one pair 

 of ovaries (belonging to the 13th segment) have been lost. 

 The sperm-ducts open by funnels into the segments con- 

 taining the testes : their external apertures are upon segment 

 xii. ; there is not a common aperture for the two vasa deferentia 

 of each side, but each opens independently, one a little in 

 front of the other. The conditions are therefore intermediate 

 between those of Phreoryctes and Eisenia *. There are two 

 pairs of vasa deferentia, as in both forms, but these open on 

 to the same segment as in Eisenia, though separately as in 

 Phreoryctes. It must be remembered, however, that at present 

 we have no knowledge of the internal structure of Eisenia. 

 In any case there is no known Limicolous Oligochaet in which 

 the vasa deferentia open on to the exterior more than one 

 segment behind that which contains the ccelomic funnel. 



Another point in which Pelodrilus presents an affinity to 

 the higher types is the specially thickened intersegmental septa 

 of certain of the anterior segments. This fact is of some 

 interest, because it tends to show that the medium in which 

 the worm lives has some relation to the presence of these thick 

 septa. Pelodrilus inhabits soil like Earthworms, and unlike 

 its more immediate allies which swim in the water or burrow 

 in the naturally soft mud at the bottom of pools and rivers. 



A new Genus allied to Eclipidrilus of Eisen. 



One of the most singular types of 01igocha?ta that has been 

 described is Eisen's genus Eclipidrilus (" Eclipidrilidse and 

 their Anatomy," Nova Act. Soc. R. Upsala, 1881). Its 

 main peculiarity consists in the inclusion of a vesicula 

 seminalis within the sperm-duct; the sperm-duct apparently 

 is not provided with a funnel of the usual pattern, but opens 

 by three apertures placed close together into the cceloin, while 

 the vesicula in its interior has a ciliated mouth. 



I have lately received from New Zealand an Annelid 

 which presents certain resemblances to Eclipidrilus. It 

 was found by Mr. Smith, of Ashburton, in water from a well 

 pumped up from a considerable depth, and I propose for it 

 the name of Phreodrilus. The accompanying diagram shows 

 the general arrangement of the sperm-duct, which is quite 

 unique in its structure, unless it proves to resemble that of 

 Eclipidrilus. The atrial pores are paired structures on seg- 



* Tetriif/onurns, the name originally proposed by Eisen for this genus, 

 being pre-occupied, Vaillant (" Annelides,'' Suites a Buffon) has suggested 

 its replacement by the name " Eisenia." 



