1907.] WORMS OF THE FAMILY EUDRILID^. 429 



The ventral seta? (text-fig. 126) are rather wide, much as in Poly- 

 toreutus, bvit the latei'al setfe are only slightly more approximated, 

 the proportions being about 5:6. It is remarkable that on the nine 

 or ten anterior segments of the body the ventral sette are very much 

 larger, perhaps twice the size of the lateral setse ; this discrepancy 

 ceases after that point, and both pairs of setse are equisized and 

 small. The ventral pair of setae of the xviith segment are 

 absent. 



The nepliTidioiiores lie in front of the lateral pair of setas, and 

 are not specially related to one or other of the pair. They appear 

 to begin in the third segment. 



The oviduccd pores are upon the xivth segment, in line with the 

 nephridiopores . 



The spermathecal pores are paired as in other species of the 

 genus. The pore of each side lies in front of the outer of the 

 ventral pair of setas. The pores are not very large. 



On the folloAving intersegmental farrow {i. e., xiii./xiv.) are 

 two pairs of minute orifices, which lie on a level with each of the 

 four ventral setse. They are rendered more conspicuous by being 

 surrounded with a yellowish area. This area is the expression of 

 internal sacs, which probably correspond to the copulatory glands 

 found in many Earthworms of the families Megascolicidfe and 

 Geoscolicidse, but not, I believe, hitherto recorded amono- the 

 Eudrilidfe. These sacs, though small, are very easily to be seen 

 when the septum separating segments xiii. and xiv. is pushed 

 forward. 



The mcde pores are very large and conspicuous, and lie between 

 segments xvii, and xviii. in a straight line with the spermathecal 

 pores. The flaps of skin surrounding the pores cause them to be 

 rather obliquely set, as is shown in the accompanying figure 

 (text-fig. 126). The hinder margin of each orifice is much 

 thickened and forms a glandular pad ; the two very nearly meet 

 in the middle line behind. 



The intersegmental septa are not very much thickened, and 

 they cease to be at all thickened after that which separates 

 segments xi./xii. The gizzard, which is well developed, though 

 not very large, lies undoubtedly in segment v. The median 

 calciferous pouches are in segments ix., x., and xi. The paired 

 calciferous glands of segment xiii. have rather an unusual form. 

 Each consists of a relatively narrow tubular coiled structure very 

 much longer than it is broad. This lies coiled on each side of the 

 gut in the xiiith segment. 



The dorsal blood-vessel is nowhere double ; the last pair of 

 heai'ts is in segment xi. 



The male organs are much like those of other species of this 

 genus. The present species is holandrous, and the sperm-sacs are 

 two pairs, more or less tongue-shaped bodies, in segments xi, 

 and xii. The ends of the sperm-ducts near to where they open 

 into the sperm-sacs are, as in other Eudrilidse, dilated into what 

 Michaelsen has termed a " Samenmagazin," As in other species 

 Proc. Zool. See— 1907, No. XXIX. 29 



