310 W. B. BENHAM. 



Fig. 31. — Criodrilus. a, b. Genital and alimeutary sys- 

 tems. OS. Ovisac. w. Thick-walled region of oesophagus. 

 From my own figures, ' Quart. Journ. Micr. Sci./ xxvii, 

 pi. xxxviii. The nephridia, similar to those of Lurabricus, 

 commence in Somite x. 



Distribution : Europe. 



Fig. 32. — Allurus. a. Genital system. Modified from Bed- 

 dard's figure, ' Quart. Journ. Micr. Sci./ xxviii, pi. xxv, fig. 2. 

 The small white circles (sp.) in Somite viii represent certain 

 microscopic spermathecse according to Beddard, but no sper- 

 matozoa were found, and perhaps, from their abnormal position, 

 they may be '^ albumen-glands.^^ os. Ovisac. In b, g. Giz- 

 zard, s. Commencement of sacculated intestine. ca.,ca. The 

 first and last of the four calciferous glands, x. A pouch 

 (? corresponds to the pouch [cp.] in Lumbricus). b. Alimen- 

 tary system. Composed from Beddard's description, ' Quart. 

 Journ. Micr. Sci.,' xxviii, p. 368. 



Distribution : Europe. 



