470 FfiANK E. BEDDAED. 



six or seven segments of the clitellum are completely occupied 

 by the modified epidermis.^ 



Hence it appears to me to be inadvisable to use the 

 characters of the clitellum to help in associating together, as 

 Rosa has done, his families Lumbricidae and Geoscolecidae. 

 The structure of Deodrilus shows that this cannot be done; 

 and there are, among the Geoscolecidae of Rosa, intermediate 

 conditions leading to Deodrilus. 



Genital Papillae. — Most earthworms are furnished with 

 genital papillae, which are often very characteristic of the 

 species in which they are found. 



Deodrilus is not an exception to this rule, and has two 

 sets of genital papillae. 



The first set consists of a single pair of large flattened 

 papillae, which are fused together to form a dumb-bell shaped 

 area extremely conspicuous. The outer convex border on each 

 side reaches to the level of the inner setae of the outer pair. 



The papillee (see PL XXXIII, fig. 12,^) are situated between 

 the 11th and 12th segments; they occupy the last annulus of the 

 former segment and the first two anuuli of the latter: the furrows 

 dividing the annuli and the two segments from each other can be 

 seen as faint lines traversing the papillae. The furrow separating 

 the last annulus of Segment 11 from the penultimate forms the 

 anterior boundary of the papillae, while its posterior boundary 

 is formed by the furrow separating the second from the third 

 annulus of Segment 12. The second set of genital papillae are 

 very much less conspicuous ; they are to be found near the male 

 genital pores, and no doubt correspond to the tubercula puber- 

 tatis : in front of each of the male orifices are two papillae— one 

 in front of the other ; and behind each is a single papilla. So 

 far as I can ascertain, they belong to Segments 17, 18, and 

 19 ; but, as I have already said, it is difficult to be certain 

 about the limits of the segments in this region of the body. 



Setae. — The setae are entirely restricted to the ventral 

 surface of the body, where they are implanted in pairs. 



* I do not for the present consider bow far the form of the clitellum may 

 be influenced by the position of the generative pores. 



