308 W. B. BENHAM. 



Fig. 28. — Brachydrilus. a, b. Genital and alimentary 

 systems. Original. See the description, ' Zool. Anzeig./ 271, 

 1888. There are two pairs of nephridia which are very simple 

 — IN. the inner nephridia ; on. the outer nephridia in every 

 somite. In the Somites x and xi are four sacs on each side, 

 which are not represented, as they lie underneath the sperm- 

 sacs ; these probably correspond to the '' albumen-glands " of 

 Lumbricus. I believe the same fusion of somites has 

 gone on here as in Microchaeta. In a, sp. is one of the small 

 spermathecse, which in position is abnormal, o. is the ovary. 

 In b, G. is the gizzard, ca. Calciferous gland, s. Commence- 

 ment of sacculated intestine. In c, the setae and nephridio- 

 pores are shown. 



Distribution : Unknown. 



Family IX. — Lumbricid^. 



Fig. 29. — Lumbricus. a, b. Genital and alimentary sys- 

 tems. Original. See Hering, ' Zeit. f. wiss. Zool.,' viii, 1856, 

 pi. xviii; Lankester (alimentary canal), 'Quart. Journ. Micr. 

 Sci.,' 1865-6. In a, sp. the first spermatheca of one side. 

 OS. Ovisac. In b, g. is gizzard, pr. Proventriculus. s.^ Com- 

 mencement of sacculated intestine. ca. Calciferous glands, 

 bilobed, one lobe in Somite xii, the other in Somite xi ; these 

 communicate with a pouch (op.) which opens into the oeso- 

 phagus in Somite xi. c shows the exterior of Somites xiv, 

 XV, and xvi, with setse, nephridiopores, oviducal pore in xiv, 

 and spermiducal pore in xv (as black dots). 



Distribution : Europe. 



Fig. 30. — Allolobophora. a. Genital system, sp. Sper- 

 matheca : three pairs are shown, as is the case in A. c hi oro- 

 tic a; in other species more, in others less than three pairs are 

 present. os. Ovisac. Modified from Bergh's figure of A. 

 turgida, ' Zeit. f. wiss. Zool.,' xliv, pi. xxi. b. Alimentary 

 canal, g. Gizzard. pr. Proventriculus. ca. Calciferous 

 gland in Somite xi, opening into the pouch (cp.). Original. 

 c. External view of a somite from three difi'erent species : a. 

 of A. chlorotica; b. of A. subrubicunda ; and c. of A. 

 boeckii.^ 



Distribution : Europe. 



1 The nephridijiorcs are too feebly indicated. 



