1911-12.] Structure and Affinities of Brctnchiomaldane vincenti. 67 
accompanying text figure. From the funnel * of the first nephridium a short 
narrow tube leads into the middle or excretory portion of the organ, and this, 
in turn, into the terminal portion, which opens to the exterior near the fifth 
neuropodium. The funnel * of the second nephridium, which is considerably 
larger than that of the first, opens into a long, slender, convoluted tube 
(rather simplified in the diagram), and this merges into the main excretory 
portion of the organ. This part, which is moderately thick-walled f 
throughout, opens by a pore near the sixth neuropodium, but extends 
backwards as far as the eighth, f and in one specimen almost to the ninth 
neuropodium, where it ends blindly. This nephridium is sometimes dilated 
at its blind end, as shown, but in other cases does not present such an 
enlargement. The first nephridium varies in length, in the different 
Diagram of the nephridia of the left side of an adult specimen, about 10 mm. long, seen from the 
inner (median) aspect. The specimen was divided mesially, the alimentary canal was dissected 
away from the left portion, and the nephridia drawn as they lay upon the body-wall. The 
crotchets of the fifth, sixth, seventh, and eighth neuropodia, and the positions of the external 
apertures (N.O. 1 , N.O. 2 ) of the nephridia are indicated, x 100. 
specimens examined, from *23 to *4 mm., and thejsecond from ‘8 to 1*0 mm. 
This elongate second nephridium, extending through three, or sometimes 
four, segments, was probably mistaken by Professors Mesnil and Fauvel 
for three or four separate nephridia. 
The reproductive organs are situated on the coelomic epithelium of 
the oblique muscles (fig. 5) and septa, and of the lateral body-wall, near 
the point of insertion of the oblique septum. They are not present in 
front of the third septum. All the specimens examined by the writer are 
hermaphrodite. The oocytes fall from the gonads, when their diameter 
is not more than 15 to 20/x, into the coelomic fluid, and there complete 
* The funnels of both nephridia are apparently of a simple type, buh they are very 
difficult 'to investigate in preserved material, and observations on living specimens are 
desirable in order to determine more fully the structure of these funnels. 
t The wall of the nephridium contains muscle fibres, which are more highly developed 
in the posterior portion of the organ, especially near the blind end. 
X Professor Mesnil (Bull. Sci. France Belg ., T. xxx. (1897), p. 154), stated that, in his 
•specimens of “ Glymenides incertus” which were undoubtedly young phases of B. vincenti, non- 
pigmented nephridia were present in the fifth, sixth and seventh chsetigerous segments. 
-Apparently the extension backwards of the second nephridium had not attained its full 
•development in these young specimens. 
